CN109286317B - DC converter based on switch capacitor - Google Patents

DC converter based on switch capacitor Download PDF

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Publication number
CN109286317B
CN109286317B CN201811492291.5A CN201811492291A CN109286317B CN 109286317 B CN109286317 B CN 109286317B CN 201811492291 A CN201811492291 A CN 201811492291A CN 109286317 B CN109286317 B CN 109286317B
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switch
switch tube
capacitor
capacitor unit
tube
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CN109286317A (en
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蔡慧
陈俐宏
魏缪宇
郭倩
陈卫民
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China Jiliang University
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China Jiliang University
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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
    • H02M3/1582—Buck-boost converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a direct current converter based on a switched capacitor, and belongs to the technical field of power electronics. The Cuk converter can realize a large transformation ratio when the duty ratio is large enough or small enough, but in practical application, the duty ratio of the converter is usually more than 0.2 and less than 0.8 due to the limitation of efficiency and switching tube pressure, so the Cuk converter is not very suitable for the occasion of high transformation ratio. The SC switched capacitor network has the characteristics of small size and high power density, but the transformation ratio is determined by a hardware circuit, and the SC switched capacitor network has natural defects in voltage modulation. The invention combines a Cuk circuit and an SC switched capacitor network, provides a direct current converter based on a switched capacitor, and realizes the output of a larger transformation ratio while continuously adjusting the output.

Description

DC converter based on switch capacitor
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a direct current converter based on a switched capacitor.
Background
The polarity of the output voltage of the Boost DC/DC converter is the same as the polarity of the input voltage, the relationship between the output voltage U o and the input voltage U I is U o＝UI/(1-d), d is the switch on duty cycle, and since d <1, there is U o>UI. The Buck step-down DC/DC converter has an output voltage of the same polarity as the input voltage, and the output voltage U o has a relationship of U o＝UI ·d with the input voltage U I, and thus U o<UI is present because d < 1. In order to realize simultaneous Buck-Boost, a Boost-Buck series structure can be adopted, and the Boost-Buck DC/DC converter is obtained after the Boost-Buck DC/DC converter is simplified, the polarity of the output voltage of the Cuk converter is opposite to that of the input voltage, the relation between the output voltage U o and the input voltage U I is U o＝-UI & d/(1-d), and in theory, the duty ratio of the Cuk converter is large enough or small enough to realize a large transformation ratio. However, in practical application, the duty ratio of the converter is usually greater than 0.2 and less than 0.8 due to the limitation of efficiency and switching tube pressure, so that the Cuk converter is not very suitable for the occasion of high transformation ratio. The SC switched capacitor network has the characteristics of small size and high power density, but the transformation ratio is determined by a hardware circuit, and the SC switched capacitor network has natural defects in voltage modulation.
In summary, how to design a simple and flexible high-transformation-ratio converter is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide a dc converter based on a switched capacitor, which can achieve a higher transformation ratio in practical applications, and the specific scheme is as follows:
The invention provides a direct current converter based on a switch capacitor, which adopts an SC circuit module embedded in a Cuk converter to realize the purpose of changing a modulation range. The converter is equivalent to a Boost circuit module, an SC circuit module and a Buck circuit module; the Boost circuit module, the SC circuit module and the Buck circuit module are sequentially connected in series.
The Boost circuit module comprises an input inductor L 1 and a switching tube Q 1;
the switching tube Q 1 adopts an N-channel MOSFET;
The inductor L 1 is connected with the drain electrode of the switching tube Q 1 and the connected part is connected with the input end of the SC circuit module; the other end of the inductor L 1 is connected with the input end of the Boost circuit module, and the source electrode of the switch tube Q 1 is connected with the public end.
The Buck circuit module comprises a diode D 1, an inductor L 2 and a capacitor C N+1;
The inductor L 2 is connected with the anode of the diode D 1 and is connected with one end of the output end of the SC circuit module, the inductor L 2 is connected with the capacitor C N+1 in series and then is connected with the diode D 1 in parallel, and the connection part of the capacitor C N+1 and the diode D 1 is connected with the other end of the output end of the SC circuit module.
The SC circuit module comprises N switch capacitor units and a capacitor C 0, wherein N is a positive integer;
The nth switched capacitor unit is represented by a switched capacitor unit n;
There are four structures for the switched capacitor unit n: structure a, structure B, structure C, structure D;
The switch capacitor unit n comprises a switch tube Q nA, a switch tube Q nB, a switch tube Q nC and a capacitor C n;
The switching tube Q nA, the switching tube Q nB and the switching tube Q nC are all N-channel MOSFETs;
Structure a: the source electrode of the switch tube Q nA is connected with the drain electrode of the switch tube Q nB, the connected position is connected with the input end of the switch capacitor unit, the drain electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connected position is connected with the output end of the switch capacitor unit, the other end of the capacitor C n is connected with the source electrode of the switch tube Q nB, the connected position is connected with the source electrode of the switch tube Q nC, the drain electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are the same as those of the switch tube Q 1, and the control signal of the switch tube Q nB is complementary with the switch tube Q 1;
Structure B: the drain electrode of the switch tube Q nA is connected with the source electrode of the switch tube Q nB, the connection part is connected with the input end of a switch capacitor unit, the source electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connection part is connected with the output end of the switch capacitor unit, the other end of the capacitor C n is connected with the drain electrode of the switch tube Q nB, the connection part is connected with the drain electrode of the switch tube Q nC, the source electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are complementary with the switch tube Q 1, and the control signal of the switch tube Q nB is the same as that of the switch tube Q 1;
Structure C: the source electrode of the switch tube Q nA is connected with the drain electrode of the switch tube Q nB, the connected position is connected with the output end of the switch capacitor unit, the drain electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connected position is connected with the input end of the switch capacitor unit, the other end of the capacitor C n is connected with the source electrode of the switch tube Q nB, the connected position is connected with the source electrode of the switch tube Q nC, the drain electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are complementary with the switch tube Q 1, and the control signal of the switch tube Q nB is the same as that of the switch tube Q 1;
Structure D: the drain electrode of the switch tube Q nA is connected with the source electrode of the switch tube Q nB, the connected position is connected with the output end of the switch capacitor unit, the source electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connected position is connected with the input end of the switch capacitor unit, the other end of the capacitor C n is connected with the drain electrode of the switch tube Q nB, the connected position is connected with the drain electrode of the switch tube Q nC, the source electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are the same as those of the switch tube Q 1, and the control signal of the switch tube Q nB is complementary with the switch tube Q 1;
The SC circuit module structure is determined by the main working area of the DC converter;
When the direct current converter mainly works in a buck mode, one end of a capacitor C 0 in an SC circuit module is connected with a drain electrode of a switching tube Q 1, the other end of the capacitor C 0 is connected with an input end of a switching capacitor unit 1, a public end of the switching capacitor unit 1 is connected with a source electrode of the switching tube Q 1, the switching capacitor unit 1 and the switching capacitor unit 2 are sequentially connected in series, a public end of the switching capacitor unit N is connected with a cathode of a diode D 1, and a public end of the switching capacitor unit N is connected with an anode of a diode D 1;
at this time, the structure of the nth switched capacitor unit is determined by N and N together;
When N is an odd number: if n is an odd number, the switch capacitor unit n adopts a structure B; if n is an even number, the switch capacitor unit n adopts a structure A;
When N is even: if n is an odd number, the switch capacitor unit n adopts a structure A; if n is an even number, the switch capacitor unit n adopts a structure B;
at this time, the relationship between the input voltage and the output voltage of the inverter is:
When the direct-current converter mainly works in a boost mode, one end of a switch capacitor unit 1 in an SC circuit module is connected with a drain electrode of a switch tube Q 1, a public end of the switch capacitor unit 1 is connected with a source electrode of the switch tube Q 1, a public end of the switch capacitor unit 1 is connected with a source electrode of the switch tube Q 1, the switch capacitor units 1 and 2 are connected in series in sequence until a switch capacitor unit n is connected with a public end, an output end of the switch capacitor unit n is connected with one end of a capacitor C 0, a public end of the switch capacitor unit n is connected with a cathode of a diode D 1, and the other end of the capacitor C 0 is connected with an anode of the diode D 1;
At this time, the structure of the nth switched capacitor unit is determined by n;
if n is an odd number, the switch capacitor unit n adopts a structure C; if n is an even number, the switch capacitor unit n adopts a structure D;
at this time, the relationship between the input voltage and the output voltage of the inverter is:
Compared with the prior art, the invention has the beneficial effects that the gain can be adjusted by increasing or reducing the number of the capacitor-opening units, so that the required gain value is obtained, and the converter is more flexible than the prior converter; SC switched capacitor circuits already provide some gain, so we will be more accurate in controlling the gain size by the duty cycle D.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a dc converter based on a switched capacitor according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a switched capacitor unit in a dc converter based on a switched capacitor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dc converter based on a switched capacitor operating in a buck state according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a dc converter based on a switched capacitor operating in a boost state according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a dc converter based on a switched capacitor, in which n=2 is specifically used in a step-down state according to an embodiment of the present invention;
fig. 6 is an equivalent circuit diagram of a specific dc converter based on switched capacitor during an off state according to an embodiment of the present invention;
Fig. 7 is an equivalent circuit diagram of a specific dc converter based on switched capacitor during an on state according to an embodiment of the present invention;
Fig. 8 is a schematic diagram of a key current voltage waveform of a dc converter based on a switched capacitor according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment of the invention discloses a direct current converter based on a switched capacitor, which is shown in fig. 1 and comprises an equivalent Boost circuit module, an SC circuit module and an equivalent Buck circuit module.
The Boost circuit module comprises an input inductor L 1 and a switching tube Q 1;
the switching tube Q 1 adopts an N-channel MOSFET;
The inductor L 1 is connected with the drain electrode of the switching tube Q 1 and the connected part is connected with the input end of the SC circuit module; the other end of the inductor L 1 is connected with the input end of the Boost circuit module, and the source electrode of the switch tube Q 1 is connected with the public end.
The Buck circuit module comprises a diode D 1, an inductor L 2 and a capacitor C N+1;
The inductor L 2 is connected with the anode of the diode D 1 and is connected with one end of the output end of the SC circuit module, the inductor L 2 is connected with the capacitor C N+1 in series and then is connected with the diode D 1 in parallel, and the connection part of the capacitor C N+1 and the diode D 1 is connected with the other end of the output end of the SC circuit module.
The SC circuit module comprises N switch capacitor units and a capacitor C 0, wherein N is a positive integer;
The nth switched capacitor unit is represented by a switched capacitor unit n;
there are four structures for the switched capacitor unit n: structure a, structure B, structure C, structure D, see fig. 2;
The switch capacitor unit n comprises a switch tube Q nA, a switch tube Q nB, a switch tube Q nC and a capacitor C n;
The switching tube Q nA, the switching tube Q nB and the switching tube Q nC are all N-channel MOSFETs;
Structure a: the source electrode of the switch tube Q nA is connected with the drain electrode of the switch tube Q nB, the connected position is connected with the input end of the switch capacitor unit, the drain electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connected position is connected with the output end of the switch capacitor unit, the other end of the capacitor C n is connected with the source electrode of the switch tube Q nB, the connected position is connected with the source electrode of the switch tube Q nC, the drain electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are the same as those of the switch tube Q 1, and the control signal of the switch tube Q nB is complementary with the switch tube Q 1;
Structure B: the drain electrode of the switch tube Q nA is connected with the source electrode of the switch tube Q nB, the connection part is connected with the input end of a switch capacitor unit, the source electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connection part is connected with the output end of the switch capacitor unit, the other end of the capacitor C n is connected with the drain electrode of the switch tube Q nB, the connection part is connected with the drain electrode of the switch tube Q nC, the source electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are complementary with the switch tube Q 1, and the control signal of the switch tube Q nB is the same as that of the switch tube Q 1;
Structure C: the source electrode of the switch tube Q nA is connected with the drain electrode of the switch tube Q nB, the connected position is connected with the output end of the switch capacitor unit, the drain electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connected position is connected with the input end of the switch capacitor unit, the other end of the capacitor C n is connected with the source electrode of the switch tube Q nB, the connected position is connected with the source electrode of the switch tube Q nC, the drain electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are complementary with the switch tube Q 1, and the control signal of the switch tube Q nB is the same as that of the switch tube Q 1;
Structure D: the drain electrode of the switch tube Q nA is connected with the source electrode of the switch tube Q nB, the connected position is connected with the output end of the switch capacitor unit, the source electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connected position is connected with the input end of the switch capacitor unit, the other end of the capacitor C n is connected with the drain electrode of the switch tube Q nB, the connected position is connected with the drain electrode of the switch tube Q nC, the source electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are the same as those of the switch tube Q 1, and the control signal of the switch tube Q nB is complementary with the switch tube Q 1;
The SC circuit module structure is determined by the main working area of the DC converter;
Referring to fig. 3, when the dc converter mainly works in the buck mode, one end of the capacitor C 0 in the SC circuit module is connected to the drain of the switching tube Q 1, the other end of the capacitor C 0 is connected to the input end of the switching capacitor unit 1, the common end of the switching capacitor unit 1 is connected to the source of the switching tube Q 1, and the switching capacitor units 1 and 2 are sequentially connected in series and the common end is connected, the common end of the switching capacitor unit N is connected to the cathode of the diode D 1, and the common end of the switching capacitor unit N is connected to the anode of the diode D 1;
at this time, the structure of the nth switched capacitor unit is determined by N and N together;
When N is an odd number: if n is an odd number, the switch capacitor unit n adopts a structure B; if n is an even number, the switch capacitor unit n adopts a structure A;
When N is even: if n is an odd number, the switch capacitor unit n adopts a structure A; if n is an even number, the switch capacitor unit n adopts a structure B;
at this time, the relationship between the input voltage and the output voltage of the inverter is:
Referring to fig. 4, when the dc converter mainly works in the boost mode, one end of the switched capacitor unit 1 in the SC circuit module is connected to the drain of the switching tube Q 1, the common end of the switched capacitor unit 1 is connected to the source of the switching tube Q 1, the common end of the switched capacitor unit 1 is connected to the source of the switching tube Q 1, the switched capacitor unit 1 and the switched capacitor unit 2 are sequentially connected in series and connected to the common end of the switched capacitor unit n, the output end of the switched capacitor unit n is connected to one end of the capacitor C 0, the common end of the switched capacitor unit n is connected to the cathode of the diode D 1, and the other end of the capacitor C 0 is connected to the anode of the diode D 1;
At this time, the structure of the nth switched capacitor unit is determined by n;
if n is an odd number, the switch capacitor unit n adopts a structure C; if n is an even number, the switch capacitor unit n adopts a structure D;
at this time, the relationship between the input voltage and the output voltage of the inverter is:
Further, a third embodiment is shown in fig. 5, which is a specific dc converter based on a switched capacitor, where n=2, and operates in buck mode.
In this embodiment, T S is the duty of the switching transistor Q 1, T on is the on time, T off is the off time, T S＝ton+toff, d is the on duty ratio:
The switching tube Q 1 is turned off in the period t 0～t1 and turned on in the period t 1～t2. The switching tube Q 1B, the switching tube Q 2A, the switching tube Q 2C and the switching tube Q 1 are simultaneously conducted; the switching tube Q 1A, the switching tube Q 1C and the switching tube Q 2B are complementarily conducted with the switching tube Q 1.
Each duty cycle of a specific dc converter based on a switched capacitor described in the third embodiment can be divided into an on state and an off state according to the switching transistor Q 1, which is specifically as follows:
off state (t 0～t1):
At time t 0, the switching tube Q 1A, the switching tube Q 1C and the switching tube Q 2B are turned on, the switching tube Q 1B, the switching tube Q 2A and the switching tube Q 2C are turned off, at this time, an equivalent loop of the converter is shown in fig. 6, the inductor L 1 charges the capacitor C 0, and the voltage of the capacitor C 0 is gradually increased; the current of the inductor L 1 gradually decreases; the capacitor C 1 releases energy, and the voltage gradually drops; capacitor C 2 is charged, and the voltage gradually rises reversely; the inductor L 2 releases energy, and the current is reversely reduced; diode D 1 is forward conducting, and the conducting current is the sum of the current of capacitor C 2 and the current of inductor L 2.
On state (t 1～t2):
At time t 1, switching tube Q 1A, switching tube Q 1C and switching tube Q 2B are turned off, switching tube Q 1B, switching tube Q 2A and switching tube Q 2C are turned on, at this time, the equivalent loop of the converter is shown in FIG. 7, inductor L 1 is charged, and the current is gradually increased; the capacitor C 0 releases energy, and the voltage gradually drops; capacitor C 1 is charged, and the voltage is gradually increased; the capacitor C 2 releases energy, and the voltage gradually decreases reversely; diode D 1 turns off in reverse; inductor L 2 charges and the current increases in opposite directions, inductor L 2 current being the sum of capacitor C 0 and capacitor C 2.
During the off state (t 0～t1), inductor L 1 releases energy, the current decreases, and the charge of inductor L 1 varies by Δq L1_off = -q; capacitor C 0 is connected in series with inductor L 1, capacitor C 0 charges, the voltage rises, and the charge variation of capacitor C 0 is Δq C0_off = +q; a charge variation Δq C0_Ts =0 of the capacitor C 0 in one cycle, and a charge variation Δq C0_on＝-ΔqC0_off = -q of the capacitor C 0 during the on state; during the on state, the capacitor C 1 is connected in series with the capacitor C 0, the capacitor C 1 is charged, the voltage rises, and the charge variation of the capacitor C 1 is Δq C1_on＝-ΔqC0_on = +q; a charge variation Δq C1_Ts =0 of the capacitor C 1 in one cycle, and a charge variation Δq C1_off = -q of the capacitor C 1 during the off state; during the off state, the branch of the capacitor C 0 is connected in parallel with the branch of the capacitor C 1 and then connected in series with the capacitor C 2, the capacitor C 2 is charged, the voltage rises, and the charge variation delta q C2_off＝ΔqC0_off-ΔqC1_off = +2q of the capacitor C 2; a charge variation Δq c2_Ts =0 of the capacitor C 2 in one cycle, and a charge variation Δq C2_on＝-ΔqC1_off = -2q of the capacitor C 2 during the on state; during the on state, the branch where the capacitor C 1 is located is connected in parallel with the branch where the capacitor C 2 is located and then is connected in series with the inductor L 2, the inductor L 2 releases energy, the current is reduced, and the variation of the inductor L 2 is delta q L2_on＝ΔqC2_on-ΔqC1_on = -3q;
During the on state and the off state, the average current of the inductor is unchanged, and the charge variation of the inductor is in direct proportion to time; during the on state, the charge variation of the inductance L 1 is:
During the off state, the charge variation of the inductance L 2 is:
in one period, the charge variation of the inductor L 1 is:
The charge variation of inductance L 2 is:
I in is the converter input current, I out is the output current, i.e. the current flowing from inductor L 2 into load R LOAD.
P in is input power, P out is output power, U in is input voltage, U out is output voltage, and in steady state, the input power is equal to the output power in one period, P in＝Pout.
Obtaining an output voltage formula of the converter in the third example:
Finally, it should also be noted that the above-described embodiments are merely some, but not all, embodiments of the present invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to fall within the scope of the present invention based on the embodiments of the present invention.

Claims (1)

1. A dc converter based on switched capacitors, characterized by: the Boost circuit module, the SC circuit module and the Buck circuit module are sequentially connected in series;
The Boost circuit module comprises an input inductor L1 and a switching tube Q1, the switching tube Q1 adopts an N-channel MOSFET, the inductor L1 is connected with a drain electrode of the switching tube Q1, the connected part is connected with an input end of the SC circuit module, the other end of the inductor L1 is connected with the input end of the Boost circuit module, and a source electrode of the switching tube Q1 is defined as a public end;
The Buck circuit module comprises a diode D1, an inductor L2 and a capacitor C N+1, wherein the inductor L2 is connected with the anode of the diode D1, the connected part is connected with one end of the output end of the SC circuit module, the inductor L 2 is connected with the capacitor C N+1 in series and then connected with the diode D 1 in parallel, and the connected part of the capacitor C N+1 and the diode D 1 is connected with the other end of the output end of the SC circuit module;
The SC circuit module includes N switch capacitor units and a capacitor C 0, where N is a positive integer, the nth switch capacitor unit is represented by a switch capacitor unit N, the switch capacitor unit N includes a switch tube Q nA, a switch tube Q nB, a switch tube Q nC and a capacitor C n, the switch tube Q nA, the switch tube Q nB and the switch tube Q nC all adopt N-channel MOSFETs, and the switch capacitor unit N has four structures: structure a, structure B, structure C, structure D;
Structure a: the source electrode of the switch tube Q nA is connected with the drain electrode of the switch tube Q nB, the connected position is connected with the input end of the switch capacitor unit, the drain electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connected position is connected with the output end of the switch capacitor unit, the other end of the capacitor C n is connected with the source electrode of the switch tube Q nB, the connected position is connected with the source electrode of the switch tube Q nC, the drain electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are the same as those of the switch tube Q 1, and the control signal of the switch tube Q nB is complementary with the switch tube Q 1;
Structure B: the drain electrode of the switch tube Q nA is connected with the source electrode of the switch tube Q nB, the connection part is connected with the input end of a switch capacitor unit, the source electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connection part is connected with the output end of the switch capacitor unit, the other end of the capacitor C n is connected with the drain electrode of the switch tube Q nB, the connection part is connected with the drain electrode of the switch tube Q nC, the source electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are complementary with the switch tube Q 1, and the control signal of the switch tube Q nB is the same as that of the switch tube Q 1;
Structure C: the source electrode of the switch tube Q nA is connected with the drain electrode of the switch tube Q nB, the connected position is connected with the output end of the switch capacitor unit, the drain electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connected position is connected with the input end of the switch capacitor unit, the other end of the capacitor C n is connected with the source electrode of the switch tube Q nB, the connected position is connected with the source electrode of the switch tube Q nC, the drain electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are complementary with the switch tube Q 1, and the control signal of the switch tube Q nB is the same as that of the switch tube Q 1;
Structure D: the drain electrode of the switch tube Q nA is connected with the source electrode of the switch tube Q nB, the connected position is connected with the output end of the switch capacitor unit, the source electrode of the switch tube Q nA is connected with one end of a capacitor C n, the connected position is connected with the input end of the switch capacitor unit, the other end of the capacitor C n is connected with the drain electrode of the switch tube Q nB, the connected position is connected with the drain electrode of the switch tube Q nC, the source electrode of the switch tube Q nC is connected with the common end of the switch capacitor unit, the control signals of the switch tube Q nA and the switch tube Q nC are the same as those of the switch tube Q 1, and the control signal of the switch tube Q nB is complementary with the switch tube Q 1;
When the direct current converter mainly works in a buck mode, one end of a capacitor C 0 in the SC circuit module is connected with the drain electrode of a switch tube Q 1, the other end of the capacitor C 0 is connected with the input end of a switch capacitor unit 1, the common end of the switch capacitor unit 1 is connected with the source electrode of a switch tube Q 1, the switch capacitor units 1 and 2 … are sequentially connected in series and are commonly connected with the common end, and the cathode of a diode D 1 is connected with the common end;
The structure of the nth switch capacitor unit is determined by N and N together;
When N is an odd number: if n is an odd number, the switch capacitor unit n adopts a structure B; if n is an even number, the switch capacitor unit n adopts a structure A;
When N is even: if n is an odd number, the switch capacitor unit n adopts a structure A; if n is an even number, the switch capacitor unit n adopts a structure B;
The relation between the input voltage and the output voltage of the converter is as follows:
When the direct current converter mainly works in a boost mode, one end of the switch capacitor unit 1 in the SC circuit module is connected with the drain electrode of the switch tube Q 1, the public end of the switch capacitor unit 1 is connected with the source electrode of the switch tube Q 1, the switch capacitor unit 1 and the switch capacitor unit 2 … are sequentially connected in series, the public ends of the switch capacitor unit 1 and the switch capacitor unit N are connected and commonly connected with the public end, the output end of the switch capacitor unit N is connected with one end of a capacitor C 0, the public end of the switch capacitor unit N is connected with the cathode of a diode D 1, and the other end of the capacitor C 0 is connected with the anode of a diode D 1;
At this time, the structure of the nth switched capacitor unit is determined by n;
If n is an odd number, the switch capacitor unit n adopts a structure C;
if n is an even number, the switch capacitor unit n adopts a structure D;
The relation between the input voltage and the output voltage of the converter is as follows:
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CN110161413B (en) * 2019-05-29 2021-05-11 中国计量大学 Test method of aluminum-air battery power converter
CN114598147A (en) * 2022-03-03 2022-06-07 珠海澳大科技研究院 Step-down DC-DC converter, control method and electronic equipment

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WO2002021672A1 (en) * 2000-09-08 2002-03-14 Slobodan Cuk Lossless switching dc-to-dc converter
CN105896993A (en) * 2016-05-30 2016-08-24 西安交通大学 High-gain isolation type direct-current converter for multi-unit diode capacitor network
CN106130064A (en) * 2016-06-30 2016-11-16 全球能源互联网研究院 A kind of photovoltaic miniature inverter
CN107612325A (en) * 2017-08-29 2018-01-19 天津大学 One kind switchs the quasi- wide gain two-way DC converter in Z sources
CN108809091A (en) * 2018-06-19 2018-11-13 四川大学 A kind of single switch buck multiple constant current output switch converters
CN209170229U (en) * 2018-12-07 2019-07-26 中国计量大学 A kind of DC converter based on switching capacity

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Publication number Priority date Publication date Assignee Title
WO2002021672A1 (en) * 2000-09-08 2002-03-14 Slobodan Cuk Lossless switching dc-to-dc converter
CN105896993A (en) * 2016-05-30 2016-08-24 西安交通大学 High-gain isolation type direct-current converter for multi-unit diode capacitor network
CN106130064A (en) * 2016-06-30 2016-11-16 全球能源互联网研究院 A kind of photovoltaic miniature inverter
CN107612325A (en) * 2017-08-29 2018-01-19 天津大学 One kind switchs the quasi- wide gain two-way DC converter in Z sources
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