CN116780898B - High-gain Cuk converter and control method thereof - Google Patents
High-gain Cuk converter and control method thereof Download PDFInfo
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Abstract
The application discloses a high-gain Cuk converter and a control method thereof, wherein the converter comprises a power supply V g A switch tube S, a resistor R and a diode D 1 、D 2 、D 3 、D 4 、D 5 、D 6 And D 7 Output diode D o Inductance L 1 、L 2 、L 3 、L 4 And L 5 Voltage doubling capacitor C and parasitic diode D s Parasitic capacitance C s . The application has the advantages that: (1) Parasitic capacitance C s Inductance L 3 And L 4 Resonance achieves ZVS of the switching tube S; when the switch is closed, the capacitor C passes through D 4 Charging, applied to L when the switch is opened 3 And L 4 The voltage of the voltage-dependent resistor is higher than that of a traditional Cuk circuit, so that high gain is realized and the voltage stress of a device is reduced; (2) Only one switching tube is used, so that the cost is saved and the structure is simplified; (3) Five working modes are realized in one period, and the application scene is expanded; (4) The parallel design of the inductors can reduce the output current ripple in the CCM mode.
Description
Technical Field
The application mainly relates to the technical field of converters, in particular to a high-gain Cuk converter and a control method thereof.
Background
In the prior art, in the process of etching a chip, an etching machine needs the chip to have high-voltage positive charges to adsorb electrons, and after etching is finished, the chip needs to have high-voltage negative charges to repel electrons. In the implementation of high voltage direct current, there are a number of ways by which: (1) The alternating current is boosted by a transformer and then rectified to form high-voltage direct current; (2) Converting the low-voltage direct current into alternating current through an inverter, boosting the alternating current through a transformer, and rectifying to form high-voltage direct current; (3) boosting is achieved using DC-DC conversion in the power electronics. However, the boost converter of the prior art has the following disadvantages: (1) The method of boosting and rectifying the direct current inversion through the transformer is adopted, and more steps are easy to generate larger energy loss; (2) The alternating current is directly boosted and rectified, and the device can face serious stress problem under the high-voltage environment; (3) The output EMI of the converter is higher, the voltage gain is smaller, the duty ratio required for realizing higher gain is larger, the circuit structure is complex, and the cost is high.
Therefore, how to design a boost converter with large voltage gain, small stress, small output EMI, small energy loss, simple circuit structure and low cost is a technical problem to be solved.
Disclosure of Invention
Based on this, it is necessary to provide a high-gain Cuk converter and a control method thereof in order to solve the conventional problems.
In a first aspect, an embodiment of the present application provides a high-gain Cuk converter, including a power supply V g A switch S, a resistor R and a first diode D 1 Second diode D 2 Third diode D 3 Fourth diode D 4 Fifth diode D 5 Sixth diode D 6 Seventh diode D 7 Output diode D o First inductor L 1 Second inductance L 2 Third inductance L 3 Fourth inductance L 4 Fifth inductance L 5 Voltage doubling capacitor C and parasitic diode D s Parasitic capacitance C s ；
Wherein, the power supply V g Respectively with the positive terminal of the first inductor L 1 Is connected to the first terminal of the first diode D 1 Is electrically connected with the positive terminal of the power supply V g The negative terminal of (a) is respectively connected with the second terminal of the switch tube S and the parasitic diode D s Positive terminal, parasitic of (a)Capacitor C s Second end, fourth inductance L 4 A second end, a seventh diode D 7 Is electrically connected to the negative terminal of the resistor R;
second diode D 2 Respectively with the positive terminal of the first diode D 1 Is connected to the negative terminal of the inductor L and the second inductor L 2 A second diode D electrically connected to the first terminal of 2 Respectively with the negative terminal of the first inductor L 1 Second terminal of (D) and third diode D 3 Is electrically connected with the positive electrode terminal of the battery; first inductance L 1 Is connected with the first end of the first diode D 1 Is electrically connected with the positive electrode terminal of the battery; third diode D 3 And a second inductance L 2 Is electrically connected to the second end of the first circuit board;
fourth diode D 4 Respectively with the positive terminal of the output diode D o A negative terminal of a fifth diode D 5 Positive terminal of (c) and third inductance L 3 A fourth diode D electrically connected to the first end of 4 The negative terminal of (a) is respectively connected with the first terminal of the voltage doubling capacitor C, the first terminal of the switching tube S and the parasitic diode D s Negative terminal of (C), parasitic capacitance s A first end, a third diode D 3 And a second inductance L 2 Is electrically connected to the second end of (a);
sixth diode D 6 Respectively with the positive terminal of the fifth diode D 5 And a fourth inductance L 4 A sixth diode D electrically connected to the first terminal of 6 Respectively with the negative terminal of the third inductor L 3 Second terminal of (D) and seventh diode D 7 Is electrically connected with the positive electrode terminal of the battery; fifth diode D 5 Positive terminal of (a) and third inductance L 3 Is electrically connected to the first end of the first connector; seventh diode D 7 Negative terminal of (2) and fourth inductance L 4 Is electrically connected to the second end of the first circuit board;
fifth inductance L 5 Respectively with the second end of the voltage doubling capacitor C and the output diode D o The positive terminal of (a) is electrically connected with the fifth inductance L 5 Is electrically connected to the first terminal of the resistor R;
the third end of the switch tube S is connected with the control circuit, and the first end and the second end of the resistor R form an output end.
Preferably, the switching tube S is a MOS tube, a first end of the switching tube S is a drain, a second end of the switching tube S is a source, and a third end of the switching tube S is a gate.
Preferably, the control circuit employs PI control.
In a second aspect, an embodiment of the present application provides a control method for a high-gain Cuk converter, including the steps of:
generating a control signal, and transmitting the control signal to a third end of the switching tube S;
and controlling the on-off of the switching tube S according to the control signal, so that the converter alternately works in a plurality of working modes in one working period.
Preferably, the plurality of working modes are five working modes, and the five working modes are a first working mode, a second working mode, a third working mode, a fourth working mode and a fifth working mode respectively.
Preferably, the first working mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 Seventh diode D 7 And output diode D o Conduction, first inductance L 1 Second inductance L 2 Inductance L 3 And inductance L 4 And charges the voltage-doubling capacitor C, and flows through the first inductor L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Is reduced linearly.
Preferably, the second working mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 Fourth diode D 4 And a sixth diode D 6 Conduction and parasitic capacitance C s Third inductance L 3 And a fourth inductance L 4 Resonance occurs.
Preferably, the third working mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 Fifth diode D 5 And a seventh diode D 7 Conduction, first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Store energy flowing through the first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 The current of (2) increases linearly.
Preferably, the fourth operation mode is: the switch S is turned on, the first diode D 1 Third diode D 3 Fourth diode D 4 And a sixth diode D 6 Conduction, third inductance L 3 And a fourth inductance L 4 Releasing energy to flow through the third inductance L 3 And a fourth inductance L 4 Is reduced linearly.
Preferably, the fifth working mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 And a sixth diode D 6 Conduction, first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 To parasitic capacitance C s Charging until the voltage of the voltage doubling capacitor C and the third inductance L 3 Is equal to the voltage of the other.
Compared with the prior art, the high-gain Cuk converter has the following advantages: (1) Parasitic capacitance C s Third inductance L 3 And a fourth inductance L 4 Forming a resonant network, realizing Zero Voltage Switching (ZVS) of the switching tube S; when the switch is closed, the voltage-multiplying capacitor C passes through the fourth diode D 4 Charging; when the switch is opened, it is applied to the third inductance L 3 And a fourth inductance L 4 The voltage of the voltage-dependent resistor is higher than that of a traditional Cuk circuit, so that the voltage stress of a device is reduced while high gain is realized; (2) The high-output converter structure is realized by only using one switching tube and circuit element in the circuit, so that the cost is saved and the circuit structure is simplified; (3) Five different working modes can be realized by the switching tube in the on-off mode, so that various changes of the modes are realized, and the application scene of the converter is expanded; (4) First inductance L 1 And a second inductance L 2 The parallel design of the circuit enables the circuit to reduce the output current ripple in the CCM mode; (5) Compared with other high gain converters, the high gain converter has the advantages of simple circuit structure, simple control scheme and powerThe device has the advantages of few devices, high efficiency, low cost, small switching loss, low output EMI and the like.
Drawings
Exemplary embodiments of the present application may be more fully understood by reference to the following drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.
FIG. 1 is a circuit diagram of a prior art Cuk chopper circuit;
FIG. 2 is a circuit diagram of a prior art soft-switch based Cuk converter;
fig. 3 is a circuit diagram of a high-gain Cuk converter according to an exemplary embodiment of the present application;
fig. 4 is a control circuit diagram of a high-gain Cuk converter according to an exemplary embodiment of the present application;
FIG. 5 is a waveform diagram of one duty cycle of a high gain Cuk converter according to an exemplary embodiment of the present application;
fig. 6 is a first operating mode circuit diagram of a high-gain Cuk converter according to an exemplary embodiment of the present application;
FIG. 7 is a second operating mode circuit diagram of a high gain Cuk converter according to an exemplary embodiment of the present application;
fig. 8 is a third operational mode circuit diagram of a high-gain Cuk converter according to an exemplary embodiment of the present application;
fig. 9 is a fourth operational mode circuit diagram of a high-gain Cuk converter according to an exemplary embodiment of the present application;
fig. 10 is a fifth operational mode circuit diagram of a high-gain Cuk converter according to an exemplary embodiment of the present application;
fig. 11 is a flowchart of a control method of a high-gain Cuk converter according to another exemplary embodiment of the present application.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, a Cuk chopper circuit of the prior art has a voltage gain according to the following formula (1):
（1）；
wherein D is the duty cycle of switch S, the voltage gain M is only related to the duty cycle of switch S, and when D is greater than 0.5, the converter is in boost mode; when D is less than 0.5, the converter is in buck mode.
Referring to fig. 2, a circuit diagram of a Cuk converter in the prior art includes two inductors, two capacitors, two diodes, a parasitic diode, two parasitic capacitors, two switching tubes, and a resistive load R, and the structure of the converter combines the advantages of a Cuk chopper circuit, so that the conversion efficiency of the converter is significantly improved, but the converter still has the problems of higher output EMI, smaller voltage gain, larger duty ratio required for realizing higher gain, complex circuit structure, high cost, and the like.
Based on this, an embodiment of the present application provides a high-gain Cuk converter, which is described below with reference to the accompanying drawings.
Referring to fig. 3, a high gain Cuk converter includes a power supply V g A switch S, a resistor R and a first diode D 1 Second diode D 2 Third diode D 3 Fourth diode D 4 Fifth diode D 5 Sixth diode D 6 Seventh diode D 7 Output diode D o First inductor L 1 Second inductance L 2 Third inductance L 3 Fourth inductance L 4 Fifth inductance L 5 Voltage doubling capacitor C and parasitic diode D s Parasitic capacitance C s ；
Wherein, the power supply V g Respectively with the positive terminal of the first inductor L 1 Is connected to the first terminal of the first diode D 1 Is electrically connected with the positive terminal of the power supply V g The negative terminal of (a) is respectively connected with the second terminal of the switch tube S and the parasitic diode D s Positive terminal of (C), parasitic capacitance s Second end, fourth inductance L 4 A second end, a seventh diode D 7 Is electrically connected to the negative terminal of the resistor R;
second diode D 2 Respectively with the positive terminal of (a)First diode D 1 Is connected to the negative terminal of the inductor L and the second inductor L 2 A second diode D electrically connected to the first terminal of 2 Respectively with the negative terminal of the first inductor L 1 Second terminal of (D) and third diode D 3 Is electrically connected with the positive electrode terminal of the battery; first inductance L 1 Is connected with the first end of the first diode D 1 Is electrically connected with the positive electrode terminal of the battery; third diode D 3 And a second inductance L 2 Is electrically connected to the second end of the first circuit board;
fourth diode D 4 Respectively with the positive terminal of the output diode D o A negative terminal of a fifth diode D 5 Positive terminal of (c) and third inductance L 3 A fourth diode D electrically connected to the first end of 4 The negative terminal of (a) is respectively connected with the first terminal of the voltage doubling capacitor C, the first terminal of the switching tube S and the parasitic diode D s Negative terminal of (C), parasitic capacitance s A first end, a third diode D 3 And a second inductance L 2 Is electrically connected to the second end of (a);
sixth diode D 6 Respectively with the positive terminal of the fifth diode D 5 And a fourth inductance L 4 A sixth diode D electrically connected to the first terminal of 6 Respectively with the negative terminal of the third inductor L 3 Second terminal of (D) and seventh diode D 7 Is electrically connected with the positive electrode terminal of the battery; fifth diode D 5 Positive terminal of (a) and third inductance L 3 Is electrically connected to the first end of the first connector; seventh diode D 7 Negative terminal of (2) and fourth inductance L 4 Is electrically connected to the second end of the first circuit board;
fifth inductance L 5 Respectively with the second end of the voltage doubling capacitor C and the output diode D o The positive terminal of (a) is electrically connected with the fifth inductance L 5 Is electrically connected to the first terminal of the resistor R;
the third end of the switch tube S is connected with the control circuit, and the first end and the second end of the resistor R form an output end.
Specifically, the power supply V g Is a direct current power supply for supplying power to the first inductor L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Store energy and supply energy to the voltage doubling capacitor C, and then turn onThe switch tube S and the resistor R are charged.
Preferably, the switching tube S is a MOS tube, a first end of the switching tube S is a drain, a second end of the switching tube S is a source, and a third end of the switching tube S is a gate; parasitic diode D s The high-speed diode is connected in parallel to the source electrode and the drain electrode of the switching tube S, and is used for protecting the switching tube S by discharging reverse induced current generated by the inductive load when the load of the tube is the inductive load.
Referring to fig. 4, the control circuit of the converter of the present embodiment adopts PI control, and outputs a PWM (pulse width modulation, which is an analog control method, to modulate the bias of the base or the gate of the transistor according to the change of the corresponding load, so as to change the on time of the transistor or the MOS transistor, thereby realizing the change of the output of the switching regulator).
Specifically, in the converter of the present embodiment, the on/off of the switching tube S of the circuit is controlled, so that the converter can alternately operate in five working modes in one working period, and referring to fig. 5, a waveform diagram of the converter in one working period is shown. Wherein at t 0 -t 1 In the time period, the converter is in a first working mode; at t 1 -t 2 In the time period, the converter is in a second working mode; at t 2 -t 3 In the time period, the converter is in a third working mode; at t 3 -t 4 During the time period, the converter is in a fourth operation mode; at t 4 -t 5 In the time period, the converter is in a fifth working mode, and specific details of the five working modes are as follows:
(1) At t 0 -t 1 In the time period, the converter is in a first operation mode, as shown in fig. 6, in which the switching tube S is turned off, the first diode D 1 Third diode D 3 Seventh diode D 7 And output diode D o Conducting, their conducting currents being the same, and from t 0 Starting at the moment, the currents flowing through them decrease linearly, at which point the voltage across the capacitor CThe following relationship is satisfied:
（2）；
wherein,representing the output voltage +.>Parasitic capacitance C representing switching tube S s The voltage across it.
At the same time, a first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Respectively through output diode D o Releasing energy to charge the voltage doubling capacitor C; due to the first inductance L 1 And a second inductance L 2 The stored energy is greater than the third inductance L 3 And a fourth inductance L 4 Stored energy, so the first inductance L 1 And a second inductance L 2 Is smaller than the third inductance L 3 And a fourth inductance L 4 Is a ripple of (1); at this time, the first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Is expressed by the following formula:
（3）；
（4）；
wherein, in the formulaRepresenting the input signal of the DC power supply, ">、/>、/>、/>And->Respectively represent the first inductances L 1 Second inductance L 2 Third inductance L 3 Fourth inductance L 4 And a fifth inductance L 5 The voltage across it. When flowing through diode D o Diode D 5 And diode D 7 When the current drop of (2) is 0, the first operation mode is ended.
(2) At t 1 -t 2 In the time period, the converter is in the second working mode, at this time, the switching tube S is disconnected, and the first diode D 1 Third diode D 3 Fourth diode D 4 And a sixth diode D 6 Conduction and parasitic capacitance C s Third inductance L 3 And a fourth inductance L 4 Resonance occurs; referring to fig. 5, the resonant currentCan be regarded as half-sinusoid, the duration in this mode being resonance time +.>Half of the resonance time +.>The method comprises the following steps:
（5）；
wherein in the formulaIs the capacitance of parasitic capacitance, wherein +.>The inductance value of the third inductor; when the resonance is ended, the second mode of operation is ended.
(3) At t 2 -t 3 During the period, the converter is in the third operation mode, as shown in FIG. 8, in which the first diode D 1 Third diode D 3 Fifth diode D 5 And a seventh diode D 7 On, the switching tube S is completely turned off, and at this time, the first inductor L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 The voltage across the terminal is represented by the following formula:
（6）；
（7）；
in this mode of operation, the first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Begin to store energy, the current flowing through them being from t 2 Starting to increase linearly with time, in the formulaRepresenting the dc power input signal.
(4) At t 3 -t 4 In the time period, the converter is in the fourth operation mode, as shown in fig. 9, at this time, the driving signal of the switching tube S is not 0, the driving signal makes the switching tube S realize ZVS on, at this time, the first diode D in the circuit 1 Third diode D 3 Fourth diode D 4 And a sixth diode D 6 Conduction, first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Is represented by the following formula:
（8）；
（9）；
in this mode of operation, the third inductance L 3 And a fourth inductance L 4 The energy starts to be released and the current flowing through them continues to decrease linearly. When the driving signal is 0, the fourth working mode is ended; wherein,is the fifth inductance L 5 The voltage across the two terminals, in the formula>Representing the dc power input signal.
(5) At t 3 -t 4 In the time period, the converter is in the fifth operation mode, as shown in fig. 10, at this time, the switching tube S is turned off, and the first diode D 1 Third diode D 3 And a sixth diode D 6 On due to parasitic capacitance C s In parallel with the switching tube S, when the switching tube S is disconnected, the inductor starts to supply a parasitic capacitance C s Charging is performed when the voltage of the voltage-multiplying capacitor C and the third inductance L 3 When the voltages of (a) are equal, the fifth operation mode ends.
Fig. 5 shows the specific parameter variation for each modality, wherein,for the driving voltage of the switching tube,as parasitic capacitance D s Voltage at two ends>For flowing through parasitic diode D s Current of->、/>、/>Andrespectively is flowing through the first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Is set in the above-described range).
In this embodiment, the voltage across the voltage-doubling capacitor C can be obtained according to formulas (2) and (4)The method comprises the following steps:
（10）；
meanwhile, according to the principle of volt-second balance, a first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 The voltage across the terminals should meet the following conditions in one cycle:
（11）；
referring to fig. 5, the voltage of the inductor is non-linearly transformed in the second operation mode, which may be considered as volt-second balance for simplicity of calculation, and thus, equation (11) may be expressed as:
（12）；
from this, the voltage gain of the high-gain Cuk converter of the present embodiment can be calculated as:
（13）；
the constraint conditions are as follows:
（14）；
wherein, in the formulaRepresenting the input signal of the direct current power supply, T being the duration of a working period, D being the duty cycle of the switching tube S in a working period, +.>Is half the resonance time of the second mode,for the working time of the first mode, +.>For the operating time of the third mode +.>The working time length of the fifth working mode; according to->、/>、/>And->The duty ratios of the obtained materials in one working period are respectively as follows: />，/>，/>，。
In this embodiment, when the duty ratio of the switching tube S is large or too small, ZVS characteristics of the switching tube S may be lost. Wherein when the duty cycle is too small, the switching voltage will resonate to multiply during the second mode of operation; when the duty ratio is too large, the switching voltage cannot resonate to zero during the second operation mode, so, for the accuracy and convenience of calculation, the duty ratio is only the maximum duty ratio as an example, the switching tube S is selected to be a soft switch, and when the driving signal arrives, the switching voltage can resonate to zero again, so that the switching voltage only has one complete resonance in the second operation mode, in this case, the resonance period can be directly calculated without calculating the resonance amplitude, and the accuracy and the high efficiency of calculation can be ensured.
In other embodiments of the present application, a method for controlling a high-gain Cuk converter is provided, and is described below with reference to the accompanying drawings.
The methods provided in other implementations of the embodiments of the present application have the same advantageous effects as the high-gain Cuk converter provided in the foregoing embodiments of the present application, for the same inventive concept.
Referring to fig. 11, a schematic diagram of a control method according to other embodiments of the application is shown. Since the method embodiments are substantially similar to the structural embodiments, the description is relatively simple, and reference is made to the description of the structural embodiments described above. The method embodiments described below are merely illustrative.
As shown in fig. 11, a control method of a high-gain Cuk converter may include the steps of:
s1101: generating a control signal, and transmitting the control signal to a third end of the switching tube S;
s1102: and controlling the on-off of the switching tube S according to the control signal, so that the converter alternately works in a plurality of working modes in one working period.
Specifically, the plurality of working modes are five working modes, and the five working modes are a first working mode, a second working mode, a third working mode, a fourth working mode and a fifth working mode respectively.
Specifically, the first working mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 Seventh diode D 7 And output diode D o Conduction, first inductance L 1 Second inductance L 2 Inductance L 3 And inductance L 4 And charges the voltage-doubling capacitor C, and flows through the first inductor L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Is reduced linearly.
Specifically, the second working mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 Fourth diode D 4 And a sixth diode D 6 Conduction and parasitic capacitance C s Third inductance L 3 And a fourth inductance L 4 Resonance occurs.
Specifically, the third working mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 Fifth diode D 5 And a seventh diode D 7 Conduction, first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Store energy flowing through the first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 The current of (2) increases linearly.
Specifically, the fourth mode of operation is: the switch S is turned on, the first diode D 1 Third diode D 3 Fourth diode D 4 And a sixth diode D 6 Conduction, third inductance L 3 And a fourth inductance L 4 Releasing energy to flow through the third inductance L 3 And a fourth inductance L 4 Is reduced linearly.
Specifically, the fifth working mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 And a sixth stepPolar tube D 6 Conduction, first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 To parasitic capacitance C s Charging until the voltage of the voltage doubling capacitor C and the third inductance L 3 Is equal to the voltage of the other.
Compared with the prior art, the high-gain Cuk converter has the following advantages: (1) Parasitic capacitance C s Third inductance L 3 And a fourth inductance L 4 Forming a resonant network, realizing Zero Voltage Switching (ZVS) of the switching tube S; when the switch is closed, the voltage-multiplying capacitor C passes through the fourth diode D 4 Charging, when the switch is opened, applied to the third inductance L 3 And a fourth inductance L 4 The voltage of the voltage-dependent resistor is higher than that of a traditional Cuk circuit, so that the voltage stress of a device is reduced while high gain is realized; (2) The high-output converter structure is realized by only using one switching tube and circuit element in the circuit, so that the cost is saved and the circuit structure is simplified; (3) Five different working modes can be realized by the switching tube in the on-off mode, so that various changes of the modes are realized, and the application scene of the converter is expanded; (4) First inductance L 1 And a second inductance L 2 The parallel design of the circuit enables the circuit to reduce the output current ripple in the CCM mode; (5) Compared with other high-gain converters, the high-gain converter has the advantages of simple circuit structure, simple control scheme, fewer power devices, high efficiency, low cost, small switching loss, low output EMI and the like.
It is noted that the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description.
Claims (10)
1. A high-gain Cuk converter, which is characterized by comprising a power supply V g A switch S, a resistor R and a first diode D 1 Second diode D 2 Third diode D 3 Fourth diode D 4 Fifth diode D 5 Sixth diode D 6 Seventh diode D 7 Output diode D o First inductor L 1 Second inductance L 2 Third inductance L 3 Fourth inductance L 4 Fifth inductance L 5 Voltage doubling capacitor C and parasitic diode D s Parasitic capacitance C s ；
Wherein, the power supply V g Respectively with the positive terminal of the first inductor L 1 Is connected to the first terminal of the first diode D 1 Is electrically connected with the positive terminal of the power supply V g The negative terminal of (a) is respectively connected with the second terminal of the switch tube S and the parasitic diode D s Positive terminal of (C), parasitic capacitance s Second end, fourth inductance L 4 A second end, a seventh diode D 7 Is electrically connected to the negative terminal of the resistor R;
second diode D 2 Respectively with the positive terminal of the first diode D 1 Is connected to the negative terminal of the inductor L and the second inductor L 2 A second diode D electrically connected to the first terminal of 2 Respectively with the negative terminal of the first inductor L 1 Second terminal of (D) and third diode D 3 Is electrically connected with the positive electrode terminal of the battery; first inductance L 1 Is connected with the first end of the first diode D 1 Is electrically connected with the positive electrode terminal of the battery; third diode D 3 And a second inductance L 2 Is electrically connected to the second end of the first circuit board;
fourth diode D 4 Respectively with the negative terminal of the output diode D o A negative terminal of a fifth diode D 5 Positive terminal of (c) and third inductance L 3 A fourth diode D electrically connected to the first end of 4 The positive terminal of (a) is respectively connected with the first terminal of the voltage doubling capacitor C, the first terminal of the switching tube S and the parasitic diode D s Negative terminal of (C), parasitic capacitance s A first end, a third diode D 3 And a second inductance L 2 Is electrically connected to the second end of (a);
sixth diode D 6 Respectively with the positive terminal of the fifth diode D 5 And a fourth inductance L 4 A sixth diode D electrically connected to the first terminal of 6 Respectively with the negative terminal of the third inductor L 3 Second terminal of (D) and seventh diode D 7 Is electrically connected with the positive electrode terminal of the battery; fifth diode D 5 Positive terminal of (a) and third inductance L 3 Is electrically connected to the first end of the first connector; seventh diode D 7 Negative terminal of (2) and fourth inductance L 4 Is electrically connected to the second end of the first circuit board;
fifth inductance L 5 Respectively with the second end of the voltage doubling capacitor C and the output diode D o The positive terminal of (a) is electrically connected with the fifth inductance L 5 Second terminal of (2) and resistor RIs electrically connected to the first end of the first connector;
the third end of the switch tube S is connected with the control circuit, and the first end and the second end of the resistor R form an output end.
2. The high-gain Cuk converter according to claim 1, wherein the switching tube S is a MOS transistor, a first end of the switching tube S is a drain, a second end of the switching tube S is a source, and a third end of the switching tube S is a gate.
3. The high gain Cuk converter according to claim 1, wherein said control circuit employs PI control.
4. A control method of a high gain Cuk converter according to any of claims 1-3, comprising the steps of:
generating a control signal, and transmitting the control signal to a third end of the switching tube S;
and controlling the on-off of the switching tube S according to the control signal, so that the converter alternately works in a plurality of working modes in one working period.
5. The method of claim 4, wherein the plurality of operating modes are five operating modes, and the five operating modes are a first operating mode, a second operating mode, a third operating mode, a fourth operating mode, and a fifth operating mode, respectively.
6. The method for controlling a high-gain Cuk converter according to claim 5, wherein the first operating mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 Seventh diode D 7 And output diode D o Conduction, first inductance L 1 Second inductance L 2 Inductance L 3 And inductance L 4 And charges the voltage-doubling capacitor C, and flows through the first inductor L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Is reduced linearly.
7. The method for controlling a high-gain Cuk converter according to claim 5, wherein the second operation mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 Fourth diode D 4 And a sixth diode D 6 Conduction and parasitic capacitance C s Third inductance L 3 And a fourth inductance L 4 Resonance occurs.
8. The method for controlling a high-gain Cuk converter according to claim 5, wherein the third operating mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 Fifth diode D 5 And a seventh diode D 7 Conduction, first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 Store energy flowing through the first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 The current of (2) increases linearly.
9. The method of claim 5, wherein the fourth operation mode is: the switch S is turned on, the first diode D 1 Third diode D 3 Fourth diode D 4 And a sixth diode D 6 Conduction, third inductance L 3 And a fourth inductance L 4 Releasing energy to flow through the third inductance L 3 And a fourth inductance L 4 Is reduced linearly.
10. The method for controlling a high-gain Cuk converter according to claim 5, wherein the fifth operation mode is: the switching tube S is disconnected, the first diode D 1 Third diode D 3 And a sixth diode D 6 Conduction, first inductance L 1 Second inductance L 2 Third inductance L 3 And a fourth inductance L 4 To parasitic capacitance C s Charging until the voltage of the voltage doubling capacitor C and the third inductance L 3 Is equal to the voltage of the other.
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