CN114825929A - High-gain conversion circuit and control method thereof - Google Patents

High-gain conversion circuit and control method thereof Download PDF

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Publication number
CN114825929A
CN114825929A CN202210299101.8A CN202210299101A CN114825929A CN 114825929 A CN114825929 A CN 114825929A CN 202210299101 A CN202210299101 A CN 202210299101A CN 114825929 A CN114825929 A CN 114825929A
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circuit
diode
capacitor
inductor
load
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徐平凡
陈嘉仕
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Zhongshan Polytechnic
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Zhongshan Polytechnic
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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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

The invention discloses a high-gain conversion circuit and a control method thereof, wherein the high-gain conversion circuit comprises a main circuit, a voltage detection circuit, a current detection circuit, a load prediction circuit, a main control circuit and a drive circuit, and the main circuit, the voltage detection circuit, the current detection circuit, the load prediction circuit, the main control circuit and the drive circuit are sequentially and electrically connected. The high-gain conversion circuit can obtain higher boost gain without high duty ratio, and solves the technical problem that the converter is difficult to obtain higher gain due to the influence of parasitic parameters in a control chip and a circuit in the existing converter.

Description

High-gain conversion circuit and control method thereof
Technical Field
The invention relates to the technical field of direct current electric energy conversion, in particular to a high-gain conversion circuit and a control method thereof.
Background
Existing DC-DC converters are widely used in industrial production life, such as:
1. in the distributed power generation system, a converter is used for boosting the output voltage of the photovoltaic array to the voltage level of a direct-current bus of a power grid;
2. in an uninterruptible power supply system, the output voltage of a lead-acid battery needs to be boosted to 380V and connected with an inverter bus;
therefore, the DC-DC converter has wide application prospect in the fields of power supply systems and the like.
Boost converters are classical Boost converters with a gain of
Figure BDA0003563733610000011
Theoretically, the gain can be infinite as long as the duty ratio is infinite as infinitesimal gain, but the duty ratio is limited by the maximum value of the control chip, so the duty ratio cannot be larger than 0.85 usually, and the Boost converter is difficult to realize high gain due to the influence of the control chip and parasitic parameters in the circuit. In addition, the same problems exist in the conventional step-up transformer such as Sepic converter and Zeta converter.
In addition, the real-world conditions are complex and diverse, and it is generally difficult to effectively model the load of the DC-DC converter, and the load value cannot be effectively given to the closed-loop control parameters of the DC-DC converter, so that the controller cannot quickly track the disturbance response to the system.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention constructs a novel high-gain converter, can obtain higher boost gain without high duty ratio, stably and effectively control the boost gain and effectively give a load value to the closed-loop control parameters of the DC-DC converter.
In order to solve the above technical problems, in one aspect, the present invention provides a high gain conversion circuit, which includes a main circuit, a voltage detection circuit, a current detection circuit, a load prediction circuit, a main control circuit, and a driving circuit, wherein the main circuit, the voltage detection circuit, the current detection circuit, the load prediction circuit, the main control circuit, and the driving circuit are electrically connected in sequence;
the main circuit comprises a first switch tube S 1 A second switch tube S 2 A load R, the first switch tube S 1 A second switch tube S 2 The load R is electrically connected;
the voltage detection circuit is connected with a load R of the main circuit and a first input end of the load prediction circuit, and detects a load voltage Vo of the load R in the main circuit and sends the load voltage Vo into the load detection circuit;
a second input terminal of the load prediction circuit and a reference voltage V ref The output end of the load prediction circuit is connected with the first input end of the main control circuit;
the second input end of the main control circuit is connected with the output end of the current detection circuit, the third input end of the main control circuit is electrically connected with the duty ratio reference value dref, the first output end of the main control circuit is connected with the first input end of the driving circuit, and the second output end of the main control circuit is connected with the second input end of the driving circuit;
the input end of the current detection circuit is electrically connected with a direct current power Vin in the main circuit;
the first output end of the driving circuit and the first switch tube S in the main circuit 1 Is electrically connected with the grid electrode of the main circuit, and the second output end of the driving circuit is connected with the second switch tube S in the main circuit 2 Is electrically connected with the grid electrode, the driving circuit outputs a control signal PWM 1 And PWM 2 And respectively sending the control signals to the first switch tube S in the main circuit 1 And a second switching tube S 2 The main circuit outputs a control signal PWM through the main circuit 1 And PWM 2 To control the first switch tube S 1 And a second switching tube S 2 So that the output voltage of the main circuit is stabilized to the reference voltage V ref 。
Aiming at the further improvement of the technical scheme, the main circuit comprises a direct current power supply Vin and a first inductor L 1 A second inductor L 2 A third inductor L 3 A first capacitor C 1 A second capacitor C 2 A third capacitor C 3 A first diode D 1 A second diode D 2 A third diode D 3 A fourth diode D 4 A fifth diode D 5 A sixth diode D 6 The seventh diode D 7 ；
The positive pole of the DC power source Vin and the first inductor L 1 First terminal of, the first diode D 1 The positive electrode of (2), the third inductance L 3 First end ofAnd the seventh diode D 7 The positive electrodes are electrically connected;
the second inductor L 1 And the second terminal of the second diode D 2 And the third diode D 3 The positive electrodes are electrically connected;
the first diode D 1 And the cathode of the second diode D 2 And the second inductor L 2 Is electrically connected with the first end of the first terminal;
the third diode D 3 And the second inductor L 2 Second terminal of, the second capacitor C 2 First terminal of, the fourth diode D 4 And the first switch tube S 1 Is electrically connected with the drain electrode;
the fourth diode D 4 And the first capacitor C 1 And the fifth diode D 5 The positive electrodes are electrically connected;
the fifth diode D 5 And the second capacitor C 2 And the sixth diode D 6 The positive electrodes are electrically connected;
the sixth diode D 6 And the negative electrode of the third capacitor C 3 Is electrically connected to a first end of the load R.
In view of the further improvement of the above technical solution, the main circuit further includes a fourth inductor L 4 A fifth inductor L 5 A fourth capacitor C 4 A fifth capacitor C 5 A sixth capacitor C 6 An eighth diode D 8 A ninth diode D 9 The twelfth polar tube D 10 Eleventh diode D 11 The twelfth diode D 12 ；
The third inductor L 3 And the eighth diode D 8 And the fourth capacitor C 4 Is connected with the first end of the first connecting pipe;
the seventh diode D 7 And the negative electrode of the fourth capacitor C 4 And the fourth inductor L 4 Is electrically connected with the first end of the first terminal;
the eighth itemDiode D 8 And the negative pole of the fourth inductor L 4 Second terminal, ninth diode D 9 First end anode and twelfth pole tube D 10 The first end positive electrode of the first terminal is electrically connected;
the ninth diode D 9 And the negative electrode of the capacitor C 5 First terminal of and the fifth inductance L 5 Is electrically connected with the first end of the first terminal;
the twelfth polar tube D 10 And the negative pole of the second inductor L 5 Second terminal of, the second switching tube S 2 And the eleventh diode D 11 The positive electrodes are electrically connected;
the sixth capacitor C 6 And the twelfth diode D 12 Is electrically connected to the second end of the load R;
the negative pole of the DC power source Vin and the first switch tube S 1 Source electrode of, the first capacitor C 1 The second terminal of (C), the third capacitor C 3 The eleventh diode D 11 Second terminal of, the sixth capacitance C 6 First terminal of, the fifth capacitance C 5 Second terminal of, the second switching tube S 2 And the twelfth diode D 12 Is electrically connected to the negative electrode of (1).
Aiming at the further improvement of the technical scheme, the control signal PWM output by the working of the driving circuit 1 And PWM 2 There are two modes, mode 1 and mode 2, wherein mode 1 is control signal PWM 1 And PWM 2 At the high level states of Vgs1 and Vgs2, the first switch tube S 1 And a second switch tube S 2 Are all conducted, the DC power Vin is applied to the first inductor L 1 A second inductor L 2 A third inductor L 3 A fourth inductor L 4 A fourth capacitor C 4 Charging, first capacitor C 1 For the second capacitor C 2 Charging, a fifth capacitor C 5 For the fifth inductance L 5 Charging, third capacitor C 3 A sixth capacitor C 6 Charging a load R; the mode 2 is a control signal PWM 1 And PWM 2 At Vgs1 andwhen Vgs2 is in low level state, the first switch tube S 1 And a second switch tube S 2 Under the condition that the DC power supply Vin and the first inductor L are both disconnected 1 A second inductor L 2 For the first capacitor C 1 Charging, DC power source Vin, third inductance L 3 A fourth inductor L 4 A fourth capacitor C 4 For the fifth capacitor C 5 Charging, DC power source Vin, third inductance L 3 A fourth inductor L 4 A fifth inductor L 5 A fourth capacitor C 4 To the sixth capacitor C 6 A load R, a DC power source Vin, a first inductor L 1 A second inductor L 2 A second capacitor C 2 For the third capacitor C 3 And charging the load R.
Aiming at the further improvement of the technical scheme, the driving circuit works in the mode 1 and mode 2 states, and L is 1 ＝L 2 ，L 3 ＝L 4 ，d 1 ＝d 2 ，L 1 Is a first inductance L 1 Inductance value, L 2 Is a second inductance L 2 Inductance value, L 3 Is a third inductance L 3 Inductance value, L 4 Is a fourth inductance L 4 Inductance value of d 1 Is PWM 1 Duty ratio of d 2 Is PWM 2 The calculated inductance voltage value of the inductor working in the two modes is as follows:
Figure BDA0003563733610000041
Figure BDA0003563733610000042
Figure BDA0003563733610000043
Figure BDA0003563733610000044
Figure BDA0003563733610000051
and has:
Figure BDA0003563733610000052
Figure BDA0003563733610000053
V C4 ＝V in
V o ＝V C3 +V C6
according to the volt-second balance theorem of the inductor and the formula above, the voltage gain G can be obtained as follows:
voltage gain
Figure BDA0003563733610000054
In another aspect, the present invention provides a control method of a high-gain conversion circuit, which performs control using the high-gain conversion circuit as set forth in claim 1, the control method including the steps of:
step 1) the voltage detection circuit detects the voltage V of the main circuit load o And sent to a load detection circuit which detects the input current I of the main circuit in And sent to the main control circuit;
step 2) the load detection circuit detects the load voltage V according to the load voltage o And a reference voltage V ref Calculating the predicted load value I p And sent to the main control circuit;
step 3) the main control circuit predicts the value I according to the load p Input current I in And duty ratio reference value D ref Perform operation d 1 ＝D ref -K 1 (I in -I p ) And d 2 ＝D ref -K 2 (I in -I p ) And fed into a drive circuit, where K 1 And K 2 Is a control coefficient;
step 4) the drive circuit is according to d 1 And d 2 Generating a control signal PWM 1 And PWM 2 And PWM is performed 1 Is sent into a first switch tube S in the main circuit 1 Gate of (2), PWM 2 A second switch tube S sent into the main circuit 2 In the gate of (1);
step 5) PWM according to the control signal 1 And PWM 2 To control the first switch tube S 1 A first switch tube S 2 So that the output voltage can be stabilized to the reference voltage V ref 。
Compared with the prior art, the high-gain conversion circuit and the control method thereof at least comprise the following technical effects:
(1) the high-gain conversion circuit comprises a main circuit, a voltage detection circuit, a current detection circuit, a load prediction circuit, a main control circuit and a drive circuit, wherein the main circuit, the voltage detection circuit, the current detection circuit, the load prediction circuit, the main control circuit and the drive circuit are sequentially and electrically connected; the main circuit comprises a first switch tube S 1 A second switch tube S 2 A load R, the first switch tube S 1 A second switch tube S 2 The load R is electrically connected, and the first output end of the driving circuit is connected with the first switch tube S in the main circuit 1 Is electrically connected with the grid electrode of the main circuit, and the second output end of the driving circuit is connected with the second switch tube S in the main circuit 2 Is electrically connected with the grid electrode, the driving circuit outputs a control signal PWM 1 And PWM 2 And respectively sending the control signals to the first switch tube S in the main circuit 1 And a second switching tube S 2 The main circuit of the invention comprises a DC power supply Vin and a first inductor L 1 A second inductor L 2 A third inductor L 3 A first capacitor C 1 A second capacitor C 2 A third capacitor C 3 A first diode D 1 A second diode D 2 A third diode D 3 A fourth diode D 4 A fifth diode D 5 The sixth diodeD 6 The seventh diode D 7 A fourth inductor L 4 A fifth inductor L 5 A fourth capacitor C 4 A fifth capacitor C 5 A sixth capacitor C 6 An eighth diode D 8 A ninth diode D 9 The twelfth polar tube D 10 Eleventh diode D 11 The twelfth diode D 12 The voltage gain G obtained by the high-gain conversion circuit of the present invention is
Figure BDA0003563733610000061
Therefore, the high-gain conversion circuit can obtain higher Boost gain without high duty ratio, and solves the technical problem that the Boost converter is difficult to realize higher gain due to the influence of parasitic parameters in a control chip and a circuit in the existing converter.
(2) The method for controlling by adopting the high-gain conversion circuit comprises the step of detecting the voltage V of the main circuit load by the voltage detection circuit o And sent to a load detection circuit which detects the input current I of the main circuit in And fed to a main control circuit, a load detection circuit based on the load voltage V o And a reference voltage V ref Calculating the predicted load value I p And fed into a main control circuit which predicts the value I according to the load p Input current I in And duty ratio reference value D ref Performing operation and sending the operation to a driving circuit according to d 1 And d 2 Generating a control signal PWM 1 And PWM 2 And PWM is performed 1 Is sent into a first switch tube S in the main circuit 1 A gate of (2), PWM 2 A second switch tube S sent into the main circuit 2 In the grid, according to the control signal PWM 1 And PWM 2 To control the first switch tube S 1 A first switch tube S 2 So that the output voltage can be stabilized to the reference voltage V ref . The control method of the invention can predict the load value under the condition that the load is unknown or changed, and further stably control the circuit to ensure that the circuit is controlledThe method has stronger robustness, and solves the technical problem that the load value of the existing DC-DC converter cannot be effectively given to the closed-loop control parameters of the DC-DC converter due to the complexity and the variability of the actual working conditions, so that the controller cannot quickly track the disturbance response to the system.
Drawings
The high-gain conversion circuit, the control method thereof and the technical effects thereof according to the present invention will be described in detail with reference to the accompanying drawings and embodiments, wherein:
FIG. 1 is a circuit diagram of a high gain conversion circuit of the present invention;
FIG. 2 is an equivalent circuit diagram of mode 1 in the second embodiment of the high-gain conversion circuit of the present invention;
FIG. 3 is an equivalent circuit diagram of mode 2 in the second embodiment of the high-gain conversion circuit of the present invention;
FIG. 4 is a flow chart of a control method of the high gain conversion circuit according to the present invention;
fig. 5 is a waveform diagram of a simulation of the high-gain conversion circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a first embodiment of the present invention provides a high-gain conversion circuit, which includes a main circuit, a voltage detection circuit, a current detection circuit, a load prediction circuit, a main control circuit, and a driving circuit, wherein the main circuit, the voltage detection circuit, the current detection circuit, the load prediction circuit, the main control circuit, and the driving circuit are electrically connected in sequence;
the main circuit comprises a first switch tube S 1 A second switch tube S 2 A load R, a first switch tube S 1 A second switch tube S 2 The load R is electrically connected;
connecting a voltage detection circuit with a load R of a main circuit and a first input end of a load prediction circuit, wherein the voltage detection circuit detects a load voltage Vo of the load R in the main circuit and sends the load voltage Vo into the load detection circuit;
second input terminal of load prediction circuit and reference voltage V ref The output end of the load prediction circuit is connected with the first input end of the main control circuit, and the load detection circuit is used for detecting the load voltage Vo and the reference voltage V ref Calculating a load predicted value Ip and sending the load predicted value Ip to a main control circuit;
the second input end of the main control circuit is connected with the output end of the current detection circuit, the third input end of the main control circuit is electrically connected with the duty ratio reference value dref, the first output end of the main control circuit is connected with the first input end of the driving circuit, and the second output end of the main control circuit is connected with the second input end of the driving circuit;
the input end of the current detection circuit is electrically connected with a direct current power Vin in the main circuit;
the first output end of the driving circuit and the first switch tube S in the main circuit 1 Is electrically connected with the grid electrode of the driving circuit, and the second output end of the driving circuit is connected with the second switch tube S in the main circuit 2 Is electrically connected with the grid electrode, and the drive circuit outputs a control signal PWM 1 And PWM 2 And respectively sending the control signals to the first switch tube S in the main circuit 1 And a second switching tube S 2 The main circuit outputs a control signal PWM 1 And PWM 2 To control the first switch tube S 1 And a second switching tube S 2 So that the output voltage of the main circuit is stabilized to the reference voltage V ref 。
In a preferred embodiment of the invention, the main circuit comprises a dc power source Vin, a first inductor L 1 A second inductor L 2 A third inductor L 3 A first capacitor C 1 A second capacitor C 2 A third capacitor C 3 A first diode D 1 A second diode D 2 A third diode D 3 A fourth diode D 4 A fifth diode D 5 The first stepSix diodes D 6 The seventh diode D 7 The main circuit also comprises a fourth inductor L 4 A fifth inductor L 5 A fourth capacitor C 4 A fifth capacitor C 5 A sixth capacitor C 6 An eighth diode D 8 A ninth diode D 9 The twelfth polar tube D 10 Eleventh diode D 11 The twelfth diode D 12 (ii) a The positive pole of the DC power Vin and the first inductor L 1 First terminal, first diode D 1 Positive electrode of (1), third inductance L 3 First terminal and seventh diode D 7 The positive electrodes are electrically connected; second inductance L 1 Second terminal and second diode D 2 Anode and third diode D 3 The positive electrodes are electrically connected; first diode D 1 Cathode of and a second diode D 2 Positive electrode and second inductor L 2 Is electrically connected with the first end of the first terminal; third diode D 3 Negative pole of and second inductance L 2 Second terminal, second capacitor C 2 First terminal of, fourth diode D 4 Positive pole and first switch tube S 1 Is electrically connected with the drain electrode; fourth diode D 4 Negative pole of and the first capacitor C 1 First terminal and fifth diode D 5 The positive electrodes are electrically connected; fifth diode D 5 Negative pole of and the second capacitor C 2 Second terminal and sixth diode D 6 The positive electrodes are electrically connected; sixth diode D 6 Negative pole of and third capacitor C 3 Is electrically connected to the first end of the load R. Third inductance L 3 Second terminal and eighth diode D 8 Positive electrode of and fourth capacitor C 4 Is connected with the first end of the first connecting pipe; seventh diode D 7 Negative pole of and fourth capacitor C 4 Second terminal and fourth inductor L 4 Is electrically connected with the first end of the first terminal; eighth diode D 8 Negative pole of and fourth inductance L 4 Second terminal, ninth diode D 9 First end anode and twelfth pole tube D 10 The first end positive electrode of the first terminal is electrically connected; ninth diode D 9 Negative pole of and a fifth capacitor C 5 First terminal and fifth inductor L 5 Is electrically connected with the first end of the first terminal; the twelfth polar tube D 10 Negative pole of (1) and a fifth inductance L 5 Second terminal, second switch tube S 2 Drain electrode of (1) and an eleventh diode (D) 11 The positive electrodes are electrically connected; sixth capacitor C 6 Second terminal and twelfth diode D 12 Is electrically connected with the second end of the load R; negative pole of DC power Vin and first switch tube S 1 Source electrode, first capacitor C 1 Second terminal, third capacitor C 3 Second terminal, eleventh diode D 11 Second terminal, sixth capacitor C 6 First terminal of (1), fifth capacitor C 5 Second terminal, second switch tube S 2 Source electrode of and the twelfth diode D 12 Is electrically connected to the negative electrode of (1). When the invention is implemented, the first switch tube S 1 And a second switching tube S 2 The NMOS transistor is arranged in the main circuit, and a Boost circuit consisting of an inductor, a switching tube, a capacitor and a diode not only plays a role in charging a load R, but also plays a role in protecting the circuit, and prevents the first switching tube S from being connected with the load R 1 Or a second switching tube S 2 When the switch is switched off, the switch is damaged by a large induced voltage generated by the inductance coil, and the circuit is influenced.
Example two: when L is 1＝ L 2 ，L 3＝ L 4 ，d 1 ＝d 2 And all inductances are sufficiently large, wherein L 1 Is a first inductance L 1 Inductance value, L 2 Is a second inductance L 2 Inductance value, L 3 Is a third inductance L 3 Inductance value, L 4 Is a fourth inductance L 4 Inductance value of d 1 Is PWM 1 Duty ratio of d 2 Is PWM 2 Taking the CCM mode of the circuit as an example, there are two operating modes of the circuit, which are as follows:
as shown in FIG. 2, when the circuit operates in mode 1, mode 1 is in the control signal PWM 1 And PWM 2 In the high-level states of Vgs1 and Vgs2, the calculated inductance voltage value in the two modes is: when the circuit works in the mode 1, the first switch tube S 1 And a second switch tube S 2 Are all conducted, the DC power Vin is applied to the first inductor L 1 A second inductor L 2 A third inductor L 3 A fourth inductor L 4 A fourth capacitor C 4 Charging, the first capacitor C 1 For the second capacitor C 2 Charging, a fifth capacitor C 5 For the fifth inductance L 5 Charging, third capacitor C 3 A sixth capacitor C 6 Charging a load R, wherein inductive currents iL1, iL2, iL3, iL4, iL5 and iL6 rise linearly;
as shown in FIG. 3, when the circuit operates in mode 2, mode 2 is in the control signal PWM 1 And PWM 2 In the low-level states of Vgs1 and Vgs2, the first switch tube S 1 And a second switch tube S 2 Under the condition that the DC power supply Vin and the first inductor L are both disconnected 1 A second inductor L 2 For the first capacitor C 1 Charging, DC power source Vin, third inductance L 3 A fourth inductor L 4 A fourth capacitor C 4 To the fifth capacitance C 5 Charging, DC power source Vin, third inductance L 3 A fourth inductor L 4 A fifth inductor L 5 A fourth capacitor C 4 To the sixth capacitor C 6 A load R, a DC power source Vin, a first inductor L 1 A second inductor L 2 A second capacitor C 2 For the third capacitor C 3 And when the load R is charged, the inductive currents iL1, iL2, iL3, iL4, iL5 and iL6 are linearly decreased.
For the circuit working in the mode 1 and mode 2 states, the calculated inductance voltage value is as follows:
Figure BDA0003563733610000101
Figure BDA0003563733610000102
Figure BDA0003563733610000103
Figure BDA0003563733610000104
Figure BDA0003563733610000105
and has:
Figure BDA0003563733610000106
Figure BDA0003563733610000107
V C4 ＝V in
V o ＝V C3 +V C6
according to the volt-second balance theorem of the inductor and the formula, the voltage gain G can be obtained as follows:
voltage gain
Figure BDA0003563733610000108
Therefore, the high-gain conversion circuit of the invention can obtain higher boost gain without high duty ratio.
Example three:
as shown in fig. 4, the present invention further provides a control method of a high-gain conversion circuit, which uses the high-gain conversion circuit as claimed in claim 1 for control, the control method comprising the steps of:
step 1) the voltage detection circuit detects the voltage V of the main circuit load o And sent to a load detection circuit which detects the input current I of the main circuit in And sent to the main control circuit;
step 2) the load detection circuit detects the load voltage V according to the load voltage o And a reference voltage V ref Calculating the predicted load value I p And sent to the main control circuit;
step 3) the main control circuit predicts the value I according to the load p Input current I in And duty ratio reference value D ref Perform operation d 1 ＝D ref -K 1 (I in -I p ) And d 2 ＝D ref -K 2 (I in -I p ) And fed into a drive circuit, where K 1 And K 2 Is a control coefficient;
step 4) the drive circuit is according to d 1 And d 2 Generating a control signal PWM 1 And PWM 2 And PWM is performed 1 Is sent into a first switch tube S in the main circuit 1 Gate of (2), PWM 2 A second switch tube S sent into the main circuit 2 In the gate of (1);
step 5) PWM according to the control signal 1 And PWM 2 To control the first switch tube S 1 A first switch tube S 2 So that the output voltage can be stabilized to the reference voltage V ref 。
Example four: as shown in fig. 5, the simulation of the boost gain obtained by the converter using the conversion circuit of the present invention is shown, wherein the parameters involved in the simulation are as follows:
Vin＝10V；L1＝200uH；L2＝200uH；L3＝100uH；L4＝100uH；L5＝330uH；C1＝100uF；C2＝100uF；C3＝100uF；C4＝47uF；C5＝47uF；C6＝330uF；d＝0.5。
the simulated waveform diagram obtained by adopting the parameters is shown in fig. 5, wherein Vgs1 is the driving signal of the first switching tube S1; vgs2 is the driving signal of the second switch tube S2; iL1 is the current waveform of the first inductor L1; iL2 is the current waveform of the second inductor L2; iL3 is the current waveform of the third inductor L3; iL4 is the current waveform of the fourth inductor L4; iL5 is the current waveform of the fifth inductor L5; vo is the waveform of the converter output voltage.
Simulation conclusions drawn in the simulation oscillogram: the converter has extremely high gain, and can achieve 14 times of boosting effect under the duty ratio of 0.5.
Compared with the prior art, the technical scheme disclosed by the embodiment has the following beneficial effects:
in the above embodiment, the voltage gain G obtained by the high-gain conversion circuit of the present invention is
Figure BDA0003563733610000121
The Boost converter can obtain higher Boost gain without high duty ratio, and solves the technical problem that the Boost converter is difficult to realize higher gain due to the influence of parasitic parameters in a control chip and a circuit in the existing converter. The control method can predict the load value under the condition that the load is unknown or changes, further stably control the circuit, enable the circuit to have stronger robustness, and solve the technical problem that the load value cannot be effectively given to the closed-loop control parameters of the DC-DC converter due to the complexity and variability of the actual working conditions of the existing DC-DC converter, so that the controller cannot quickly track the disturbance response to the system.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (6)

1. A high gain conversion circuit, comprising a conversion circuit for correcting a user's sitting posture, characterized in that: the high-gain conversion circuit comprises a main circuit, a voltage detection circuit, a current detection circuit, a load prediction circuit, a main control circuit and a drive circuit, wherein the main circuit, the voltage detection circuit, the current detection circuit, the load prediction circuit, the main control circuit and the drive circuit are sequentially and electrically connected;
the main circuit comprises a first switch tube S 1 A second switch tube S 2 A load R, the first switch tube S 1 A second switch tube S 2 The load R is electrically connected;
the voltage detection circuit is connected with a load R of the main circuit and a first input end of the load prediction circuit, and detects a load voltage Vo of the load R in the main circuit and sends the load voltage Vo into the load detection circuit;
a second input terminal of the load prediction circuit and a reference voltage V ref The output end of the load prediction circuit is connected with the first input end of the main control circuit;
the second input end of the main control circuit is connected with the output end of the current detection circuit, the third input end of the main control circuit is electrically connected with the duty ratio reference value dref, the first output end of the main control circuit is connected with the first input end of the driving circuit, and the second output end of the main control circuit is connected with the second input end of the driving circuit;
the input end of the current detection circuit is electrically connected with a direct current power Vin in the main circuit;
the first output end of the driving circuit and the first switch tube S in the main circuit 1 Is electrically connected with the grid electrode of the main circuit, and the second output end of the driving circuit is connected with the second switch tube S in the main circuit 2 Is electrically connected with the grid electrode, the driving circuit outputs a control signal PWM 1 And PWM 2 And respectively sending the control signals to the first switch tube S in the main circuit 1 And a second switching tube S 2 The main circuit outputs a control signal PWM through the main circuit 1 And PWM 2 To control the first switch tube S 1 And a second switching tube S 2 So that the output voltage of the main circuit is stabilized to the reference voltage V ref 。
2. The high gain conversion circuit of claim 1, wherein: the main circuit comprises a DC power supply Vin and a first inductor L 1 A second inductor L 2 A third inductor L 3 A first capacitor C 1 A second capacitor C 2 A third capacitor C 3 A first diode D 1 A second diode D 2 A third diode D 3 A fourth diode D 4 A fifth diode D 5 A sixth diode D 6 A seventh diode D 7 ；
The positive pole of the DC power source Vin and the first inductor L 1 First ofTerminal, the first diode D 1 The positive electrode of (2), the third inductance L 3 And said seventh diode D 7 The positive electrodes are electrically connected;
the second inductor L 1 And the second terminal of the second diode D 2 And the third diode D 3 The positive electrodes are electrically connected;
the first diode D 1 And the cathode of the second diode D 2 And the second inductor L 2 Is electrically connected with the first end of the first terminal;
the third diode D 3 And the second inductor L 2 Second terminal of, the second capacitor C 2 The first terminal of (1), the fourth diode D 4 And the first switch tube S 1 Is electrically connected with the drain electrode;
the fourth diode D 4 And the first capacitor C 1 And the fifth diode D 5 The positive electrodes are electrically connected;
the fifth diode D 5 And the second capacitor C 2 And the sixth diode D 6 The positive electrodes are electrically connected;
the sixth diode D 6 And the negative electrode of the third capacitor C 3 Is electrically connected to a first end of the load R.
3. The high gain conversion circuit of claim 2, wherein: the main circuit further comprises a fourth inductor L 4 A fifth inductor L 5 A fourth capacitor C 4 A fifth capacitor C 5 A sixth capacitor C 6 An eighth diode D 8 A ninth diode D 9 The twelfth polar tube D 10 Eleventh diode D 11 The twelfth diode D 12 ；
The third inductor L 3 And the eighth diode D 8 And the fourth capacitor C 4 Is connected with the first end of the first connecting pipe;
the seventh diode D 7 Is negativePole and the fourth capacitor C 4 And the fourth inductor L 4 Is electrically connected with the first end of the first terminal;
the eighth diode D 8 And the negative pole of the fourth inductor L 4 Second terminal, ninth diode D 9 First end anode and twelfth pole tube D 10 The first end positive electrode of the first terminal is electrically connected;
the ninth diode D 9 And the negative electrode of the capacitor C 5 First terminal of and the fifth inductance L 5 Is electrically connected with the first end of the first terminal;
the twelfth polar tube D 10 And the negative pole of the second inductor L 5 Second terminal of, the second switching tube S 2 And the eleventh diode D 11 The positive electrodes are electrically connected;
the sixth capacitor C 6 And the twelfth diode D 12 Is electrically connected to the second end of the load R;
the negative pole of the DC power source Vin and the first switch tube S 1 Source electrode of, the first capacitor C 1 The second terminal of (C), the third capacitor C 3 The eleventh diode D 11 Second terminal of, the sixth capacitance C 6 First terminal of, the fifth capacitance C 5 Second terminal of, the second switching tube S 2 And the twelfth diode D 12 Is electrically connected to the negative electrode of (1).
4. The high gain conversion circuit as claimed in claim 1, wherein: control signal PWM output by the drive circuit 1 And PWM 2 There are two modes, mode 1 and mode 2, wherein mode 1 is control signal PWM 1 And PWM 2 At the high level states of Vgs1 and Vgs2, the first switch tube S 1 And a second switch tube S 2 Are all conducted, the DC power Vin is applied to the first inductor L 1 A second inductor L 2 A third inductor L 3 A fourth inductor L 4 A fourth capacitor C 4 Charging, first capacitor C 1 For the second capacitor C 2 Charging, fifth capacitor C 5 For the fifth inductance L 5 Charging, third capacitor C 3 A sixth capacitor C 6 Charging a load R; the mode 2 is a control signal PWM 1 And PWM 2 At low Vgs1 and Vgs2, the first switch tube S 1 And a second switch tube S 2 Under the condition that the DC power supply Vin and the first inductor L are both disconnected 1 A second inductor L 2 For the first capacitor C 1 Charging, DC power source Vin, third inductance L 3 A fourth inductor L 4 A fourth capacitor C 4 For the fifth capacitor C 5 Charging, DC power source Vin, third inductance L 3 A fourth inductor L 4 A fifth inductor L 5 A fourth capacitor C 4 To the sixth capacitor C 6 A load R, a DC power source Vin, a first inductor L 1 A second inductor L 2 A second capacitor C 2 For the third capacitor C 3 And charging the load R.
5. The high-gain conversion circuit according to claim 4, wherein: the drive circuit works in a mode 1 state and a mode 2 state, and L 1 ＝L 2 ，L 3 ＝L 4 ，d 1 ＝d 2 ，L 1 Is a first inductance L 1 Inductance value, L 2 Is a second inductance L 2 Inductance value, L 3 Is a third inductance L 3 Inductance value, L 4 Is a fourth inductance L 4 Inductance value of d 1 Is PWM 1 Duty ratio of d 2 Is PWM 2 The calculated inductance voltage value of the inductor working in the two modes is as follows:
Figure FDA0003563733600000031
Figure FDA0003563733600000032
Figure FDA0003563733600000033
Figure FDA0003563733600000041
Figure FDA0003563733600000042
and has:
Figure FDA0003563733600000043
Figure FDA0003563733600000044
V C4 ＝V in
V o ＝V C3 +V C6
according to the volt-second balance theorem of the inductor and the formula above, the voltage gain G can be obtained as follows:
voltage gain
Figure FDA0003563733600000045
6. A control method of a high gain conversion circuit is characterized in that: the control method using the high gain conversion circuit as claimed in claim 1, the control method comprising the steps of:
step 1) the voltage detection circuit detects the voltage V of the main circuit load o And sent to a load detection circuit which detects the input current I of the main circuit in And sent to the main control circuit;
step 2) the load detection circuit is based onLoad voltage V o And a reference voltage V ref Calculating the predicted load value I p And sent to the main control circuit;
step 3) the main control circuit predicts the value I according to the load p Input current I in And duty ratio reference value D ref Perform operation d 1 ＝D ref -K 1 (I in -I p ) And d 2 ＝D ref -K 2 (I in -I p ) And fed into a drive circuit, where K 1 And K 2 Is a control coefficient;
step 4) the drive circuit is according to d 1 And d 2 Generating a control signal PWM 1 And PWM 2 And PWM is performed 1 Is sent into a first switch tube S in the main circuit 1 Gate of (2), PWM 2 A second switch tube S sent into the main circuit 2 In the gate of (1);
step 5) PWM according to the control signal 1 And PWM 2 To control the first switch tube S 1 A first switch tube S 2 So that the output voltage can be stabilized to the reference voltage V ref 。
CN202210299101.8A 2022-03-24 2022-03-24 High-gain conversion circuit and control method thereof Pending CN114825929A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115694167A (en) * 2022-11-14 2023-02-03 广东工业大学 Multi-mode voltage conversion circuit and control thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115694167A (en) * 2022-11-14 2023-02-03 广东工业大学 Multi-mode voltage conversion circuit and control thereof
CN115694167B (en) * 2022-11-14 2023-04-25 广东工业大学 Multimode voltage conversion circuit and control thereof

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