CN114785128A - Gain-adjustable high-conversion-ratio DC/DC converter with wide input voltage range - Google Patents

Gain-adjustable high-conversion-ratio DC/DC converter with wide input voltage range Download PDF

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CN114785128A
CN114785128A CN202210434761.2A CN202210434761A CN114785128A CN 114785128 A CN114785128 A CN 114785128A CN 202210434761 A CN202210434761 A CN 202210434761A CN 114785128 A CN114785128 A CN 114785128A
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converter
electrically connected
voltage
negative
bridge circuit
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杜贵平
朱天生
郑昊
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South China University of Technology SCUT
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South China University of Technology SCUT
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Priority to CN202210434761.2A priority Critical patent/CN114785128A/en
Publication of CN114785128A publication Critical patent/CN114785128A/en
Priority to PCT/CN2022/121396 priority patent/WO2023206952A1/en
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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
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter

Abstract

The invention discloses a gain-adjustable high-transformation-ratio DC/DC converter with a wide input voltage range, which consists of an N-level high-transformation-ratio DC/DC converter, a negative-pressure output DC/DC converter and a first capacitor; n is an integer greater than or equal to 2, the variable ratio value of the input voltage and the output voltage of the N-level high-conversion-ratio DC/DC converter is a fixed value, and the variable ratio value is related to the number of levels N, the wiring mode of the converter and the type of a basic conversion unit forming the converter; the negative-voltage output DC/DC converter can output negative voltage, the voltage gain of the negative voltage is adjusted by controlling the on-off time of the switch tube, the wide-range voltage input of the power supply is adapted, and the input voltage of the N-level high-transformation-ratio DC/DC converter is adjusted. The invention improves the traditional switch resonant converter, improves the voltage transformation ratio of the converter, and realizes the stability and the adjustability of the output voltage of the load side when the input voltage changes in a wide range and fluctuates.

Description

Gain-adjustable high-conversion-ratio DC/DC converter with wide input voltage range
Technical Field
The invention relates to the technical field of DC/DC converters, in particular to a gain-adjustable high-transformation-ratio DC/DC converter with a wide input voltage range.
Background
Currently, the intermediate bus architecture of 48V is commonly used for server power supply, and the 48V is converted from power on a server mainboard. The existing technical scheme adopts a two-stage voltage transformation framework, the middle voltage is firstly transformed to 12V through one-time voltage transformation, and then the voltage is transformed to the required low voltage of 3.3V, 1.2V and the like through one-time voltage transformation, the two-stage voltage transformation can increase the electric energy loss of the system, so that the efficiency of the system is reduced, and the volume of the system is improved, so that the power density is reduced. The traditional switch resonant cavity converter needs a large number of switch tubes to form a high-level DC/DC converter to realize high transformation ratio, and the high-transformation-ratio DC/DC converter is generally in an open-loop operation state without voltage regulation and has poor immunity to input voltage fluctuation and load power fluctuation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a gain-adjustable high-conversion-ratio DC/DC converter with wide input voltage range, which consists of an N-level high-conversion-ratio DC/DC converter and a negative-pressure output DC/DC converter, reduces the electric energy loss, improves the power supply efficiency, reduces the power supply volume and improves the power density; compared with the traditional switch resonant cavity converter, the size and the using amount of devices are reduced, besides, the negative voltage value of the negative voltage output DC/DC converter is adjusted, so that the system can resist the fluctuation and wide range change of the power supply voltage, the stability of the input voltage of the N-level high-transformation ratio DC/DC converter is maintained, and the effect of maintaining the stability of the output voltage is realized.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the gain-adjustable high-conversion-ratio DC/DC converter with wide input voltage range is composed of an N-level high-conversion-ratio DC/DC converter, a negative-pressure output DC/DC converter and a first capacitor, wherein the N-level high-conversion-ratio DC/DC converter is an N-level converter composed of N-level conversion units, and N is an integer greater than or equal to 2; the N-level converter is a non-isolated converter and is used for realizing voltage conversion with high transformation ratio; the negative-voltage output DC/DC converter is an isolated converter or a non-isolated converter, can output negative voltage, and adapts to the wide input voltage range of a power supply by adjusting the voltage gain of the negative voltage;
the negative-pressure output DC/DC converter is provided with a positive input end, a negative input end and a negative output end, and the N-level high-transformation-ratio DC/DC converter is provided with a positive input end, a negative input end, a positive output end and a negative output end; the positive input end of the negative pressure output DC/DC converter is electrically connected with the positive input end of the N-level high-transformation-ratio DC/DC converter and the positive electrode of the power supply, the negative input end of the negative pressure output DC/DC converter is electrically connected with the negative electrode of the power supply and the positive electrode of the first capacitor, and the negative output end of the negative pressure output DC/DC converter is electrically connected with the negative input end of the N-level high-transformation-ratio DC/DC converter, the negative electrode of the first capacitor and the grounding port; the positive output end of the N-level high-transformation-ratio DC/DC converter is electrically connected with the positive electrode of the load, the negative output end of the N-level high-transformation-ratio DC/DC converter is electrically connected with the negative electrode of the load and the grounding port, the negative electrode of the power supply is electrically connected with the positive electrode of the first capacitor, and the negative electrode of the first capacitor is electrically connected with the grounding port;
the variable ratio of the input voltage and the output voltage of the N-level high-conversion-ratio DC/DC converter is a fixed value, the variable ratio is related to the level number N, the wiring mode of the converter and the type of a basic conversion unit forming the converter, the maximum value of the variable ratio is related to N, and the following rules are met: the 2-level conversion unit realizes 5 times of transformation ratio, the 3-level conversion unit realizes 13 times of transformation ratio, and when N is more than 3, the transformation ratio is the item-by-item accumulation from the transformation ratio value realized by the N-1 level to the transformation ratio value realized by the 2 nd level, the addition of the transformation ratio value realized by the N-1 level and the addition of 3; the ratio of the output voltage to the input voltage of the converter is influenced by the on-off time of a switch tube in the negative-voltage output DC/DC converter, so that the duty ratio of the switch tube is controlled to adjust the value of the negative-voltage output, the voltage fluctuation and wide range change of a power supply are resisted, the stability of the input voltage of the N-level high-transformation-ratio DC/DC converter is maintained by adjusting the value of the negative voltage of the negative-voltage output DC/DC converter, and the effect of maintaining the stability of the output voltage is realized.
Preferably, the negative voltage output DC/DC converter is a non-isolated converter, and is composed of a first switch tube, a second switch tube and an inductor, where the first switch tube, the second switch tube and the inductor are both two-terminal elements, and each of the two-terminal elements includes a first terminal and a second terminal; the first end of the first switch tube is electrically connected with the first end of the half-bridge circuit, the second end of the first switch tube is electrically connected with the midpoint of the half-bridge circuit and the first end of the second switch tube, and the second end of the second switch tube is electrically connected with the second end of the half-bridge circuit; the first end of the inductor is electrically connected with the midpoint of the half-bridge circuit, and the second end of the inductor is electrically connected with the negative input end of the negative-voltage output DC/DC converter; the first end of the half-bridge circuit is electrically connected with the positive input end of the negative-pressure output DC/DC converter, and the second end of the half-bridge circuit is electrically connected with the negative output end of the negative-pressure output DC/DC converter;
let the voltage of the first capacitor be VcThe voltage of the power supply is VinThe duty ratio of the first switch tube is D, the duty ratio of the second switch tube is 1-D, the value of D is 0-1, and the relation between the voltage of the first capacitor and the voltage of the power supply is as follows:
Figure BDA0003612559350000031
by adjusting the value of D, the output voltage of the negative-voltage output DC/DC converter can be adjusted, and the input voltage value V of the N-level high-transformation-ratio DC/DC converter is ensured when the voltage of the power supply is input in a wide rangein+VcAnd is not changed.
Preferably, the negative voltage output DC/DC converter is a non-isolated converter, and is composed of elements, such as a first inductor, a second capacitor, a switching tube, and a diode, where each of the elements is a two-terminal element including a first terminal and a second terminal; the first end of the first inductor is electrically connected with the first end of the switch tube and the first end of the second capacitor, and the second end of the first inductor is electrically connected with the positive input end of the negative-voltage output DC/DC converter; the first end of the second inductor is electrically connected with the second end of the second capacitor and the second end of the diode, and the second end of the second inductor is electrically connected with the negative output end of the negative voltage output DC/DC converter; the negative input end of the negative voltage output DC/DC converter is electrically connected with the first end of the diode and the second end of the switching tube;
let the voltage of the first capacitor be VcThe voltage of the power supply is VinThe duty ratio of the switching tube is D, the value of D is 0-1, and the relation between the voltage of the first capacitor and the voltage of the power supply is as follows:
Figure BDA0003612559350000041
by adjusting the value of D, the output voltage of the negative-voltage output DC/DC converter can be adjusted, and the input voltage value V of the N-level high-transformation-ratio DC/DC converter is ensured when the voltage of the power supply is input in a wide rangein+VcAnd is not changed.
Preferably, the negative-voltage output DC/DC converter is an isolation converter and consists of a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a first inductor, a second capacitor, a third capacitor and a transformer; the switch tube, the inductor and the capacitor are two-terminal elements and comprise a first terminal and a second terminal; the transformer is provided with a primary side first end, a primary side second end, a secondary side first end, a secondary side second end and a secondary side middle point, the number of turns of an inductance winding between the primary side first end and the primary side second end is p, the number of turns of the inductance winding between the secondary side first end and the secondary side middle point is s, the number of turns of the inductance winding between the secondary side middle point and the secondary side second end is s, and the primary side winding is electrically isolated from the secondary side winding;
the first end of the first switch tube is electrically connected with the first end of the second switch tube and the negative input end of the negative-pressure output DC/DC converter, the midpoint of the secondary side of the transformer is electrically connected with the negative output end of the negative-pressure output DC/DC converter, the first end of the secondary side of the transformer is electrically connected with the second end of the first switch tube, and the second end of the secondary side of the transformer is electrically connected with the second end of the second switch tube; the third switching tube and the fourth switching tube which run complementarily form a first half-bridge circuit, the first half-bridge circuit comprises a first end, a second end and a middle point, the first end of the third switching tube is electrically connected with the first end of the first half-bridge circuit, the second end of the third switching tube is electrically connected with the middle point of the first half-bridge circuit and the first end of the fourth switching tube, and the second end of the fourth switching tube is electrically connected with the second end of the first half-bridge circuit; the first end of the fifth switching tube is electrically connected with the first end of the second half-bridge circuit, the second end of the fifth switching tube is electrically connected with the midpoint of the second half-bridge circuit and the first end of the sixth switching tube, and the second end of the sixth switching tube is electrically connected with the second end of the second half-bridge circuit;
the positive input end of the negative voltage output DC/DC converter is electrically connected with the first end of the second capacitor, the first end of the first half-bridge circuit and the first end of the second half-bridge circuit, and the negative input end of the negative voltage output DC/DC converter is electrically connected with the second end of the second capacitor, the second end of the first half-bridge circuit and the second end of the second half-bridge circuit; the first end of the first inductor is electrically connected with the midpoint of the second half-bridge circuit, the second end of the first inductor is electrically connected with the first end of the second inductor and the first end of the primary side of the transformer, the first end of the third capacitor is electrically connected with the midpoint of the first half-bridge circuit, and the second end of the third capacitor is electrically connected with the second end of the second inductor and the second end of the primary side of the transformer;
let the voltage of the first capacitor be VcThe voltage of the power supply is VinAfter the values of p and s of the transformer are determined, the voltage transformation ratio of the transformer is a fixed value, and the output voltage V of the DC/DC converter can be output in a negative voltage mode by adjusting the duty ratio or the switching frequency of the switching tubecAdjustable, ensuring the input voltage value V of the N-level high-transformation-ratio DC/DC converter when the voltage of the power supply is input in a wide rangein+VcAnd is not changed.
Preferably, the N-level high-conversion-ratio DC/DC converter is an N-level converter, and is composed of N-level conversion units, the 1 st-level conversion unit employs a first-type basic conversion unit, and the other conversion units except the 1 st-level conversion unit employ a first-type basic conversion unit or a second-type basic conversion unit, and the first-type basic conversion unit and the second-type basic conversion unit both include:
an input port;
an output port;
a first resonant cavity comprising a first end and a second end;
the second resonant cavity comprises a first end and a second end, and the first end of the second resonant cavity is electrically connected with the output port;
the first half-bridge circuit comprises a first end, a second end and a midpoint, the midpoint of the first half-bridge circuit is electrically connected with the first end of the first resonant cavity, the first end of the first half-bridge circuit is electrically connected with the input port, and the second end of the first half-bridge circuit is electrically connected with the output port;
the second half-bridge circuit comprises a first end, a second end and a midpoint, the midpoint of the second half-bridge circuit is electrically connected with the second end of the first resonant cavity, the first end of the second half-bridge circuit is electrically connected with the output port, and the second end of the second half-bridge circuit is electrically connected with the grounding port;
the second end of the second resonant cavity of the first type basic transformation unit is electrically connected with the ground port, and the second type basic transformation unit further comprises:
the second half-bridge circuit comprises a first end, a second end and a midpoint, the midpoint of the second half-bridge circuit is electrically connected with the second end of the second resonant cavity of the second class of basic conversion unit, the first end of the second half-bridge circuit is electrically connected with the output port of the first-stage conversion unit, and the second end of the second half-bridge circuit is electrically connected with the ground port;
the first half-bridge circuit is composed of a first switching tube and a second switching tube which run complementarily, the first end of the first switching tube is electrically connected with the second end of the second switching tube and the midpoint of the first half-bridge circuit, the second end of the first switching tube is electrically connected with the second end of the first half-bridge circuit, and the first end of the second switching tube is electrically connected with the first end of the first half-bridge circuit; the second half-bridge circuit is composed of a third switching tube and a fourth switching tube which run complementarily, the first end of the third switching tube is electrically connected with the second end of the fourth switching tube and the midpoint of the second half-bridge circuit, the second end of the third switching tube is electrically connected with the second end of the second half-bridge circuit, and the first end of the fourth switching tube is electrically connected with the first end of the second half-bridge circuit; the third half-bridge circuit is composed of a fifth switching tube and a sixth switching tube which run complementarily, wherein the first end of the fifth switching tube is electrically connected with the second end of the sixth switching tube and the midpoint of the third half-bridge circuit, the second end of the fifth switching tube is electrically connected with the second end of the third half-bridge circuit, and the first end of the sixth switching tube is electrically connected with the first end of the third half-bridge circuit;
the output port of the 1 st level conversion unit in the N-level converter is the positive output end of the N-level high-conversion-ratio DC/DC converter and is electrically connected with the positive electrode of a load, the output ports of other conversion units except the 1 st level conversion unit are electrically connected with the input port of the lower level conversion unit, the input port of the N-level conversion unit is the positive input end of the N-level high-conversion-ratio DC/DC converter, and the negative input end, the negative output end and the grounding port of the N-level high-conversion-ratio DC/DC converter are at the same potential.
Preferably, the first resonant cavity is formed by an inductor and a capacitor, and the inductor is electrically connected in series with the capacitor.
Preferably, the second resonant cavity is formed by an inductor and a capacitor, the inductor being electrically connected in series with the capacitor, or only the capacitor.
Preferably, all the first switching tubes and all the third switching tubes of the 1 st-nth conversion units and the sixth switching tube of each conversion unit composed of the second-type basic conversion units are turned on and turned off simultaneously, and all the second switching tubes and all the fourth switching tubes of the 1 st-nth conversion units and the fifth switching tube of each conversion unit composed of the second-type basic conversion units are turned on and turned off simultaneously; under the condition of not considering dead time, the on-off duty ratio of each switching tube is 50%; all the switch tubes of each stage of the 1 st stage conversion unit to the N stage conversion unit are in variable frequency or fixed frequency operation.
Compared with the prior art, the invention has the following advantages and beneficial effects:
compared with the traditional two-stage series-connected converter, the invention has the advantages that only one main power converter for voltage conversion is arranged, so that the electric energy conversion times are reduced, the electric energy loss is reduced, the efficiency of the converter is improved, the size of the converter is reduced, and the power density is improved.
Compared with the existing switch resonant cavity converter, the invention improves the transformation ratio of input voltage and output voltage, reduces the using quantity of switch devices and inductance and capacitance under the condition of adopting the same number of conversion units, reduces the electric energy loss, improves the efficiency of the converter and reduces the cost.
By controlling the on-off time of a switching tube of the negative-pressure output DC/DC converter, the voltage value of the output negative voltage can be adjusted, the input voltage of the N-level high-transformation-ratio DC/DC converter is adjusted, the wide-range voltage input of the power supply is adapted, the voltage fluctuation of the power supply is resisted, and the stable adjustment of the output voltage at the load side is realized.
Drawings
Fig. 1 is a schematic structural diagram of a first-type basic transformation unit according to this embodiment.
Fig. 2 is a schematic structural diagram of a second type of basic transform unit in this embodiment.
Fig. 3 is a schematic diagram of the resonant cavity structure of the present embodiment.
Fig. 4 is a schematic diagram of a half-bridge circuit structure according to the present embodiment.
Fig. 5 is a schematic diagram of the overall structure and connection mode of the negative voltage output DC/DC converter and the N-level high transformation ratio DC/DC converter of the present embodiment.
Fig. 6 is a schematic diagram of a specific circuit connection embodiment of the first negative voltage output DC/DC converter implementation manner when the number N of conversion units is 3.
Fig. 7 is a schematic diagram of a circuit connection specific embodiment of the second negative voltage output DC/DC converter implementation manner when the number N of conversion units is 3.
Fig. 8 is a schematic diagram of a circuit connection embodiment of a third negative voltage output DC/DC converter implementation manner when the number N of conversion units is 3 according to the present embodiment.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
The embodiment provides a gain-adjustable high-conversion-ratio DC/DC converter with a wide input voltage range, which is composed of an N-level high-conversion-ratio DC/DC converter, a negative-pressure output DC/DC converter and a first capacitor, wherein the N-level high-conversion-ratio DC/DC converter is an N-level converter composed of N-level conversion units, and N is an integer greater than or equal to 2; the N-level converter is a non-isolated converter, consists of elements such as a switching tube, a capacitor, an inductor and the like, and is used for realizing voltage conversion with high transformation ratio; the negative-voltage output DC/DC converter is an isolated converter or a non-isolated converter, consists of some elements of a switch tube, an inductor, a capacitor, a diode and a transformer, can output negative voltage, and adapts to the wide input voltage range of a power supply by adjusting the voltage gain of the negative voltage.
The 1 st level conversion unit of the N level converter adopts a first type basic conversion unit, and other conversion units except the 1 st level conversion unit adopt the first type basic conversion unit or a second type basic conversion unit.
As shown in fig. 1, the first type of basic transform unit includes: the device comprises an input port, an output port, a first resonant cavity, a second resonant cavity, a first half-bridge circuit, a second half-bridge circuit and a grounding port. The first end of the first half-bridge circuit is electrically connected with the input port, and the second end of the first half-bridge circuit is electrically connected with the output port; the first end of the first resonant cavity is electrically connected with the midpoint of the first half-bridge circuit, and the second end of the first resonant cavity is electrically connected with the midpoint of the second half-bridge circuit; the first end of the second resonant cavity is electrically connected with the output port, and the second end of the second resonant cavity is electrically connected with the grounding port.
As shown in fig. 2, the second class of basic transform unit includes: the resonant cavity comprises an input port, an output port, a first resonant cavity, a second resonant cavity, a first half-bridge circuit, a second half-bridge circuit and a third half-bridge circuit. The first end of the first half-bridge circuit is electrically connected with the input port, and the second end of the first half-bridge circuit is electrically connected with the output port; the first end of the first resonant cavity is electrically connected with the midpoint of the first half-bridge circuit, and the second end of the first resonant cavity is electrically connected with the midpoint of the second half-bridge circuit; the first end of the second resonant cavity is electrically connected with the output port, and the second end of the second resonant cavity is electrically connected with the midpoint of the third half-bridge circuit.
As shown in fig. 3, the resonant cavity includes a first end and a second end, and is formed by an inductor and a capacitor, and the inductor is electrically connected in series with the capacitor; or may consist of only a capacitor.
As shown in fig. 4, the half-bridge circuit includes a first terminal, a second terminal and a middle point, and is formed by a first switching tube and a second switching tube that operate complementarily, and the switching tubes operate in a variable frequency or a fixed frequency.
A first end of a second half-bridge circuit of the N-level converter is electrically connected with the output port, and a second end of the second half-bridge circuit of the N-level converter is electrically connected with the ground port; and a first end of a third half-bridge circuit in the second type basic conversion unit is electrically connected with an output port of the lower-stage conversion unit, and a second end of the third half-bridge circuit is electrically connected with a ground port. The output port of the 1 st level conversion unit in the N-level converter is the positive output end of the N-level high-conversion-ratio DC/DC converter and is electrically connected with the positive electrode of a load, the output ports of other conversion units except the 1 st level conversion unit are electrically connected with the input port of the lower level conversion unit, the input port of the N-level conversion unit is the positive input end of the N-level high-conversion-ratio DC/DC converter, and the negative input end, the negative output end and the grounding port of the N-level high-conversion-ratio DC/DC converter are at the same potential.
The first half-bridge circuit of the N-level converter is composed of a first switching tube Q1 and a second switching tube Q2 which operate in a complementary mode, the first end of the first switching tube Q1 is electrically connected with the second end of the second switching tube Q2 and the midpoint of the first half-bridge circuit, the second end of the first switching tube Q1 is electrically connected with the second end of the first half-bridge circuit, and the first end of the second switching tube Q2 is electrically connected with the first end of the first half-bridge circuit; the second half-bridge circuit is composed of a third switching tube Q3 and a fourth switching tube Q4 which operate in a complementary mode, the first end of the third switching tube Q3 is electrically connected with the second end of the fourth switching tube Q4 and the middle point of the second half-bridge circuit, the second end of the third switching tube Q3 is electrically connected with the second end of the second half-bridge circuit, and the first end of the fourth switching tube Q4 is electrically connected with the first end of the second half-bridge circuit; the third half-bridge circuit is composed of a fifth switching tube Q5 and a sixth switching tube Q6, which operate complementarily, a first end of the fifth switching tube Q5 is electrically connected to a second end of the sixth switching tube Q6 and a midpoint of the third half-bridge circuit, a second end of the fifth switching tube Q5 is electrically connected to a second end of the third half-bridge circuit, and a first end of the sixth switching tube Q6 is electrically connected to a first end of the third half-bridge circuit.
All the first switch tubes Q1 and all the third switch tubes Q3 of the 1 st to N th conversion units of the N-level converter and the sixth switch tube Q6 of each conversion unit formed by the second basic conversion units are turned on and turned off simultaneously, and all the second switch tubes Q2 and all the fourth switch tubes Q4 of the 1 st to N th conversion units and the fifth switch tube Q5 of each conversion unit formed by the second basic conversion units are turned on and turned off simultaneously. The on-off duty ratio of each switching tube is 50% without considering the dead time. All the switch tubes of each stage of the 1 st stage conversion unit to the N th stage conversion unit work in a variable frequency or fixed frequency mode.
The variable ratio of the input voltage and the output voltage of the N-level converter is a fixed value, the variable ratio is related to the number of levels N, the wiring mode of the converter and the type of a basic conversion unit forming the converter, the maximum value of the variable ratio is related to N, and the following rules are satisfied: the 2-level conversion unit realizes 5 times of transformation ratio, the 3-level conversion unit realizes 13 times of transformation ratio, and when N is larger than 3, the transformation ratio is the item-by-item accumulation from the transformation ratio value realized by the N-1 level to the transformation ratio value realized by the 2 level, the addition of the transformation ratio value realized by the N-1 level and the addition of 3.
As shown in fig. 5, the negative voltage output DC/DC converter has a positive input terminal, a negative input terminal, and a negative output terminal, and the N-level high transformation ratio DC/DC converter has a positive input terminal, a negative input terminal, a positive output terminal, and a negative output terminal; the positive input end of the negative pressure output DC/DC converter is electrically connected with the positive input end of the N-level high-transformation-ratio DC/DC converter and the positive electrode of the power supply, the negative input end of the negative pressure output DC/DC converter is electrically connected with the negative electrode of the power supply and the positive electrode of the first capacitor C, and the negative output end of the negative pressure output DC/DC converter is electrically connected with the negative input end of the N-level high-transformation-ratio DC/DC converter, the negative electrode of the first capacitor C and the grounding port; the positive output end of the N-level high-transformation-ratio DC/DC converter is electrically connected with the positive electrode of the load, the negative output end of the N-level high-transformation-ratio DC/DC converter is electrically connected with the negative electrode of the load and the grounding port, the negative electrode of the power supply is electrically connected with the positive electrode of the first capacitor C, and the negative electrode of the first capacitor C is electrically connected with the grounding port.
The on-off time of a switch tube in the negative-pressure output DC/DC converter influences the ratio of the output voltage and the input voltage of the converter, so that the duty ratio of the switch tube is controlled to adjust the value of the negative-pressure output, the voltage fluctuation and the wide-range change of a power supply are resisted, the stability of the input voltage of the N-level high-transformation-ratio DC/DC converter is maintained by adjusting the value of the negative voltage of the negative-pressure output DC/DC converter, and the effect of maintaining the stability of the output voltage is realized.
As shown in fig. 6, the negative voltage output DC/DC converter is a non-isolated converter, and is composed of a first switch tube S1, a second switch tube S2, and an inductor L, where each of the elements is a two-terminal element, and includes a first terminal and a second terminal; the first switch tube S1 and the second switch tube S2 which are operated complementarily form a half-bridge circuit, the half-bridge circuit includes a first end, a second end and a midpoint, the first end of the first switch tube S1 is electrically connected to the first end of the half-bridge circuit, the second end of the first switch tube S1 is electrically connected to the midpoint of the half-bridge circuit and the first end of the second switch tube S2, and the second end of the second switch tube S2 is electrically connected to the second end of the half-bridge circuit; the first end of the inductor L is electrically connected with the midpoint of the half-bridge circuit, and the second end of the inductor L is electrically connected with the negative input end of the negative voltage output DC/DC converter; the first end of the half-bridge circuit is electrically connected with the positive input end of the negative-pressure output DC/DC converter, and the second end of the half-bridge circuit is electrically connected with the negative output end of the negative-pressure output DC/DC converter; let the voltage of the first capacitor C be VcThe voltage of the power supply is VinThe duty ratio of the first switch tube S1 is D, the duty ratio of the second switch tube S2 is 1-D, the value of D is 0-1, and the voltage of the first capacitor C and the voltage V of the power supply sourceinThe relation of (A) is as follows:
Figure BDA0003612559350000121
by adjusting the value of D, the output voltage of the negative-voltage output DC/DC converter can be adjusted, and the input voltage value V of the N-level high-transformation-ratio DC/DC converter is ensured when the voltage of the power supply is input in a wide rangein+VcAnd is not changed.
As shown in fig. 7, the negative voltage output DC/DC converter is a non-isolated converter, and is composed of a first inductor L1, a second inductor L2, a second capacitor C1, a switching tube S1, and a diode D, where each of the above elements is a two-terminal element, and includes a first terminal and a second terminal; a first end of the first inductor L1 is electrically connected to the first end of the switching tube S1 and the first end of the second capacitor C1, and a second end of the first inductor L1 is electrically connected to the positive input end of the negative voltage output DC/DC converter; the first end of the second inductor L2 is electrically connected with the second end of the second capacitor C1The second end of the second inductor L2 is electrically connected with the negative output end of the negative voltage output DC/DC converter; the negative input end of the negative voltage output DC/DC converter is electrically connected with the first end of the diode D and the second end of the switching tube S1; let the voltage of the first capacitor C be VcThe voltage of the power supply is VinThe duty ratio of the switching tube S1 is D, the value of D is 0-1, and the voltage of the first capacitor C and the voltage V of the power supply sourceinThe relation of (A) is as follows:
Figure BDA0003612559350000122
by adjusting the value of D, the output voltage of the negative-voltage output DC/DC converter can be adjusted, and the input voltage value V of the N-level high-transformation-ratio DC/DC converter is ensured when the voltage of the power supply is input in a wide rangein+VcAnd is not changed.
As shown in fig. 8, the negative voltage output DC/DC converter is an isolation converter, and is composed of first, second, third, fourth, fifth, and sixth switching tubes, a first inductor, a second capacitor, a third capacitor, and a transformer; the switch tube, the inductor and the capacitor are two-terminal elements and comprise a first terminal and a second terminal; the transformer is provided with a primary side first end, a primary side second end, a secondary side first end, a secondary side second end and a secondary side middle point, the number of turns of an inductance winding between the primary side first end and the primary side second end is p, the number of turns of the inductance winding between the secondary side first end and the secondary side middle point is s, the number of turns of the inductance winding between the secondary side middle point and the secondary side second end is s, and the primary side winding is electrically isolated from the secondary side winding. The first end of the first switch tube is electrically connected with the first end of the second switch tube and the negative input end of the negative-pressure output DC/DC converter, the midpoint of the secondary side of the transformer is electrically connected with the negative output end of the negative-pressure output DC/DC converter, the first end of the secondary side of the transformer is electrically connected with the second end of the first switch tube, and the second end of the secondary side of the transformer is electrically connected with the second end of the second switch tube; the third switching tube and the fourth switching tube which run complementarily form a first half-bridge circuit, the first half-bridge circuit comprises a first end, a second end and a middle point, the first end of the third switching tube is electrically connected with the first end of the first half-bridge circuit, the second end of the third switching tube is electrically connected with the middle point of the first half-bridge circuit and the first end of the fourth switching tube, and the second end of the fourth switching tube is electrically connected with the second end of the first half-bridge circuit; the fifth switching tube and the sixth switching tube which are operated complementarily form a second half-bridge circuit, the second half-bridge circuit comprises a first end, a second end and a midpoint, the first end of the fifth switching tube is electrically connected with the first end of the second half-bridge circuit, the second end of the fifth switching tube is electrically connected with the midpoint of the second half-bridge circuit and the first end of the sixth switching tube, and the second end of the sixth switching tube is electrically connected with the second end of the second half-bridge circuit.
The positive input end of the negative voltage output DC/DC converter is electrically connected with the first end of the second capacitor, the first end of the first half-bridge circuit and the first end of the second half-bridge circuit, and the negative input end of the negative voltage output DC/DC converter is electrically connected with the second end of the second capacitor, the second end of the first half-bridge circuit and the second end of the second half-bridge circuit; the first end of the first inductor is electrically connected with the midpoint of the second half-bridge circuit, the second end of the first inductor is electrically connected with the first end of the second inductor and the first end of the primary side of the transformer, the first end of the third capacitor is electrically connected with the midpoint of the first half-bridge circuit, and the second end of the third capacitor is electrically connected with the second end of the second inductor and the second end of the primary side of the transformer; let the voltage of the first capacitor be VcThe voltage of the power supply is VinAfter the values of p and s of the transformer are determined, the voltage transformation ratio of the transformer is a fixed value, and the output voltage V of the DC/DC converter can be output at negative pressure by adjusting the duty ratio or the switching frequency of the switching tubecThe adjustable voltage-regulating circuit can be adjusted to ensure that the input voltage value V of the N-level high-transformation-ratio DC/DC converter is input in a wide range of the voltage of the power supplyin+VcAnd is not changed.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, so that the changes in the shape and connection principle of the present invention should be covered within the protection scope of the present invention.

Claims (8)

1. The gain-adjustable high-transformation-ratio DC/DC converter with wide input voltage range is characterized in that: the converter is composed of an N-level high-transformation-ratio DC/DC converter, a negative-pressure output DC/DC converter and a first capacitor, wherein the N-level high-transformation-ratio DC/DC converter is an N-level converter composed of N-level conversion units, and N is an integer greater than or equal to 2; the N-level converter is a non-isolated converter and is used for realizing voltage conversion with high transformation ratio; the negative-voltage output DC/DC converter is an isolated converter or a non-isolated converter, can output negative voltage, and adapts to a wide input voltage range of a power supply by adjusting the voltage gain of the negative voltage;
the negative-pressure output DC/DC converter is provided with a positive input end, a negative input end and a negative output end, and the N-level high-transformation-ratio DC/DC converter is provided with a positive input end, a negative input end, a positive output end and a negative output end; the positive input end of the negative pressure output DC/DC converter is electrically connected with the positive input end of the N-level high-transformation-ratio DC/DC converter and the positive electrode of the power supply, the negative input end of the negative pressure output DC/DC converter is electrically connected with the negative electrode of the power supply and the positive electrode of the first capacitor, and the negative output end of the negative pressure output DC/DC converter is electrically connected with the negative input end of the N-level high-transformation-ratio DC/DC converter, the negative electrode of the first capacitor and the grounding port; the positive output end of the N-level high-transformation-ratio DC/DC converter is electrically connected with the positive electrode of the load, the negative output end of the N-level high-transformation-ratio DC/DC converter is electrically connected with the negative electrode of the load and the grounding port, the negative electrode of the power supply is electrically connected with the positive electrode of the first capacitor, and the negative electrode of the first capacitor is electrically connected with the grounding port;
the variable ratio of the input voltage and the output voltage of the N-level high-conversion-ratio DC/DC converter is a fixed value, the variable ratio is related to the level number N, the wiring mode of the converter and the type of a basic conversion unit forming the converter, the maximum value of the variable ratio is related to N, and the following rules are satisfied: the 2-level conversion unit realizes 5 times of transformation ratio, the 3-level conversion unit realizes 13 times of transformation ratio, and when N is larger than 3, the transformation ratio is the item-by-item accumulation from the transformation ratio value realized by the N-1 level to the transformation ratio value realized by the 2 nd level, the addition of the transformation ratio value realized by the N-1 level and the addition of 3; the on-off time of a switching tube in the negative-voltage output DC/DC converter influences the ratio of the output voltage and the input voltage of the converter, so that the duty ratio of the switching tube is controlled to adjust the value of the negative-voltage output, the voltage fluctuation and the wide-range change of a power supply are resisted, the stability of the input voltage of the N-level high-transformation-ratio DC/DC converter is maintained by adjusting the value of the negative voltage of the negative-voltage output DC/DC converter, and the effect of maintaining the stability of the output voltage is achieved.
2. The wide input voltage range gain-adjustable high conversion ratio DC/DC converter according to claim 1, wherein: the negative-voltage output DC/DC converter is a non-isolated converter and consists of a first switching tube, a second switching tube and an inductor, wherein the elements are two-end elements and comprise a first end and a second end; the first end of the first switching tube is electrically connected with the first end of the half-bridge circuit, the second end of the first switching tube is electrically connected with the midpoint of the half-bridge circuit and the first end of the second switching tube, and the second end of the second switching tube is electrically connected with the second end of the half-bridge circuit; the first end of the inductor is electrically connected with the midpoint of the half-bridge circuit, and the second end of the inductor is electrically connected with the negative input end of the negative-voltage output DC/DC converter; the first end of the half-bridge circuit is electrically connected with the positive input end of the negative-pressure output DC/DC converter, and the second end of the half-bridge circuit is electrically connected with the negative output end of the negative-pressure output DC/DC converter;
let the voltage of the first capacitor be VcThe voltage of the power supply is VinThe duty ratio of the first switch tube is D, the duty ratio of the second switch tube is 1-D, the value of D is 0-1, and the relation between the voltage of the first capacitor and the voltage of the power supply is as follows:
Figure FDA0003612559340000021
by adjusting the value of D, the output voltage of the negative-voltage output DC/DC converter can be adjusted, and the input voltage value V of the N-level high-transformation-ratio DC/DC converter is ensured when the voltage of the power supply is input in a wide rangein+VcAnd is not changed.
3. The wide input voltage range gain-adjustable high conversion ratio DC/DC converter according to claim 1, wherein: the negative-pressure output DC/DC converter is a non-isolated converter and consists of elements such as a first inductor, a second capacitor, a switching tube and a diode, wherein each element is a two-end element and comprises a first end and a second end; the first end of the first inductor is electrically connected with the first end of the switch tube and the first end of the second capacitor, and the second end of the first inductor is electrically connected with the positive input end of the negative-voltage output DC/DC converter; the first end of the second inductor is electrically connected with the second end of the second capacitor and the second end of the diode, and the second end of the second inductor is electrically connected with the negative output end of the negative voltage output DC/DC converter; the negative input end of the negative voltage output DC/DC converter is electrically connected with the first end of the diode and the second end of the switching tube;
let the voltage of the first capacitor be VcThe voltage of the power supply is VinThe duty ratio of the switching tube is D, the value of D is 0-1, and the relation between the voltage of the first capacitor and the voltage of the power supply is as follows:
Figure FDA0003612559340000031
by adjusting the value of D, the output voltage of the negative-voltage output DC/DC converter can be adjusted, and the input voltage value V of the N-level high-transformation-ratio DC/DC converter is ensured when the voltage of the power supply is input in a wide rangein+VcAnd is not changed.
4. The wide input voltage range gain-adjustable high conversion ratio DC/DC converter according to claim 1, wherein: the negative-pressure output DC/DC converter is an isolation converter and consists of a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a first inductor, a second capacitor, a third capacitor and a transformer; the switch tube, the inductor and the capacitor are two-terminal elements and comprise a first terminal and a second terminal; the transformer is provided with a primary side first end, a primary side second end, a secondary side first end, a secondary side second end and a secondary side middle point, the number of turns of an inductance winding between the primary side first end and the primary side second end is p, the number of turns of the inductance winding between the secondary side first end and the secondary side middle point is s, the number of turns of the inductance winding between the secondary side middle point and the secondary side second end is s, and the primary side winding is electrically isolated from the secondary side winding;
the first end of the first switch tube is electrically connected with the first end of the second switch tube and the negative input end of the negative-pressure output DC/DC converter, the midpoint of the secondary side of the transformer is electrically connected with the negative output end of the negative-pressure output DC/DC converter, the first end of the secondary side of the transformer is electrically connected with the second end of the first switch tube, and the second end of the secondary side of the transformer is electrically connected with the second end of the second switch tube; the third switching tube and the fourth switching tube which run complementarily form a first half-bridge circuit, the first half-bridge circuit comprises a first end, a second end and a middle point, the first end of the third switching tube is electrically connected with the first end of the first half-bridge circuit, the second end of the third switching tube is electrically connected with the middle point of the first half-bridge circuit and the first end of the fourth switching tube, and the second end of the fourth switching tube is electrically connected with the second end of the first half-bridge circuit; a fifth switching tube and a sixth switching tube which are operated complementarily form a second half-bridge circuit, the second half-bridge circuit comprises a first end, a second end and a midpoint, the first end of the fifth switching tube is electrically connected with the first end of the second half-bridge circuit, the second end of the fifth switching tube is electrically connected with the midpoint of the second half-bridge circuit and the first end of the sixth switching tube, and the second end of the sixth switching tube is electrically connected with the second end of the second half-bridge circuit;
the positive input end of the negative-pressure output DC/DC converter is electrically connected with the first end of the second capacitor, the first end of the first half-bridge circuit and the first end of the second half-bridge circuit, and the negative input end of the negative-pressure output DC/DC converter is electrically connected with the second end of the second capacitor, the second end of the first half-bridge circuit and the second end of the second half-bridge circuit; the first end of the first inductor is electrically connected with the midpoint of the second half-bridge circuit, the second end of the first inductor is electrically connected with the first end of the second inductor and the first end of the primary side of the transformer, the first end of the third capacitor is electrically connected with the midpoint of the first half-bridge circuit, and the second end of the third capacitor is electrically connected with the second end of the second inductor and the second end of the primary side of the transformer;
let the voltage of the first capacitor be VcThe voltage of the power supply is VinAfter the values of p and s of the transformer are determined, the voltage transformation ratio of the transformer is a fixed value and can be adjusted to be onThe duty ratio or switching frequency of the switch-off tube enables the output voltage V of the negative-voltage output DC/DC convertercThe adjustable voltage-regulating circuit can be adjusted to ensure that the input voltage value V of the N-level high-transformation-ratio DC/DC converter is input in a wide range of the voltage of the power supplyin+VcAnd is not changed.
5. The wide input voltage range gain-adjustable high conversion ratio DC/DC converter according to claim 1, wherein: the N-level high-transformation-ratio DC/DC converter is an N-level converter and is composed of N-level conversion units, wherein the 1 st-level conversion unit adopts a first-class basic conversion unit, other conversion units except the 1 st-level conversion unit adopt a first-class basic conversion unit or a second-class basic conversion unit, and the first-class basic conversion unit and the second-class basic conversion unit respectively comprise:
an input port;
an output port;
a first resonant cavity comprising a first end and a second end;
the second resonant cavity comprises a first end and a second end, and the first end of the second resonant cavity is electrically connected with the output port;
the first half-bridge circuit comprises a first end, a second end and a midpoint, the midpoint of the first half-bridge circuit is electrically connected with the first end of the first resonant cavity, the first end of the first half-bridge circuit is electrically connected with the input port, and the second end of the first half-bridge circuit is electrically connected with the output port;
the second half-bridge circuit comprises a first end, a second end and a midpoint, the midpoint of the second half-bridge circuit is electrically connected with the second end of the first resonant cavity, the first end of the second half-bridge circuit is electrically connected with the output port, and the second end of the second half-bridge circuit is electrically connected with the grounding port;
the second end of the second resonant cavity of the first type basic conversion unit is electrically connected with the ground port, and the second type basic conversion unit further comprises:
the second half-bridge circuit comprises a first end, a second end and a midpoint, the midpoint of the second half-bridge circuit is electrically connected with the second end of the second resonant cavity of the second class of basic conversion unit, the first end of the second half-bridge circuit is electrically connected with the output port of the first-stage conversion unit, and the second end of the second half-bridge circuit is electrically connected with the ground port;
the first half-bridge circuit is composed of a first switching tube and a second switching tube which run complementarily, the first end of the first switching tube is electrically connected with the second end of the second switching tube and the midpoint of the first half-bridge circuit, the second end of the first switching tube is electrically connected with the second end of the first half-bridge circuit, and the first end of the second switching tube is electrically connected with the first end of the first half-bridge circuit; the second half-bridge circuit is composed of a third switching tube and a fourth switching tube which run complementarily, the first end of the third switching tube is electrically connected with the second end of the fourth switching tube and the midpoint of the second half-bridge circuit, the second end of the third switching tube is electrically connected with the second end of the second half-bridge circuit, and the first end of the fourth switching tube is electrically connected with the first end of the second half-bridge circuit; the third half-bridge circuit is composed of a fifth switching tube and a sixth switching tube which run complementarily, wherein the first end of the fifth switching tube is electrically connected with the second end of the sixth switching tube and the midpoint of the third half-bridge circuit, the second end of the fifth switching tube is electrically connected with the second end of the third half-bridge circuit, and the first end of the sixth switching tube is electrically connected with the first end of the third half-bridge circuit;
the output port of the 1 st level conversion unit in the N-level converter is the positive output end of the N-level high-conversion-ratio DC/DC converter and is electrically connected with the positive electrode of a load, the output ports of other conversion units except the 1 st level conversion unit are electrically connected with the input port of the lower level conversion unit, the input port of the N-level conversion unit is the positive input end of the N-level high-conversion-ratio DC/DC converter, and the negative input end, the negative output end and the grounding port of the N-level high-conversion-ratio DC/DC converter are at the same potential.
6. The wide input voltage range gain-adjustable high-conversion-ratio DC/DC converter according to claim 5, wherein: the first resonant cavity is formed by an inductor and a capacitor, and the inductor is electrically connected with the capacitor in series.
7. The wide input voltage range gain-adjustable high conversion ratio DC/DC converter according to claim 5, wherein: the second resonant cavity is formed by an inductor and a capacitor, the inductor and the capacitor are electrically connected in series, or only the capacitor is formed.
8. The wide input voltage range gain-adjustable high-conversion-ratio DC/DC converter according to claim 5, wherein: all the first switching tubes and all the third switching tubes of the 1 st-Nth-stage conversion units and the sixth switching tubes of each stage of conversion units formed by the second-type basic conversion units are simultaneously conducted and simultaneously turned off, and all the second switching tubes and all the fourth switching tubes of the 1 st-Nth-stage conversion units and the fifth switching tubes of each stage of conversion units formed by the second-type basic conversion units are simultaneously conducted and simultaneously turned off; under the condition of not considering dead time, the on-off duty ratio of each switching tube is 50%; all the switch tubes of each stage of the 1 st stage conversion unit to the N stage conversion unit are in variable frequency or fixed frequency operation.
CN202210434761.2A 2022-04-24 2022-04-24 Gain-adjustable high-conversion-ratio DC/DC converter with wide input voltage range Pending CN114785128A (en)

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CN102497102B (en) * 2011-12-24 2014-01-15 西安启芯微电子有限公司 Synchronous buck-boost DC-DC conversion circuit with wide output range
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