CN113949270A - Boost circuit control method and device - Google Patents

Boost circuit control method and device Download PDF

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Publication number
CN113949270A
CN113949270A CN202111577484.2A CN202111577484A CN113949270A CN 113949270 A CN113949270 A CN 113949270A CN 202111577484 A CN202111577484 A CN 202111577484A CN 113949270 A CN113949270 A CN 113949270A
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Prior art keywords
tube
negative value
junction
capacitor
inductor
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Chinese (zh)
Inventor
杨锡旺
朱哲
付瑜
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Shanghai Lanqu New Energy Technology Co ltd
Jiangsu Soarwhale Green Technology Co ltd
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Shanghai Lanqu New Energy Technology Co ltd
Jiangsu Soarwhale Green Technology Co ltd
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Priority to CN202111577484.2A priority Critical patent/CN113949270A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
    • 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
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection

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

Abstract

The application provides a boost circuit control method, which comprises the following steps: connecting an inductor to the junction capacitance of the first tube and the junction capacitance of the second tube, discharging the junction capacitance of the first tube through an inductor current, and charging the junction capacitance of the second tube; opening the first tube, switching on an input voltage, and calculating a specific negative value of the inductive current; and when the inductive current drops to the specific negative value, closing the first tube, and resonating the junction capacitor of the first tube, the junction capacitor of the second tube and the inductor by using the inductive current which drops to a preset negative value to enable the voltage of the second tube to drop to zero. And calculating the lowest negative value of the inductance according to the frequency to be controlled to limit the frequency comparison width so as to realize the frequency limitation. The application also provides a boost circuit control device.

Description

Boost circuit control method and device
Technical Field
The present disclosure relates to power supply boosting technologies, and particularly to a control method for a boost circuit. The application also provides a boost circuit control device.
Background
The boost circuit has extensive application in new energy system, electric automobile and traditional high-power, but efficiency promotion method is limited, and traditional scheme is, constitutes resonant circuit through additionally adding passive device and realizes soft switch, for example zero voltage quasi-resonance, zero current quasi-resonance, zero voltage multi-resonant circuit etc. to this promotes efficiency. Or, a Boost (booster circuit) converter controlled by frequency conversion is adopted, and complete soft switching can be realized without adding additional auxiliary devices. Meanwhile, the frequency limiting mode of frequency conversion control solves the problem that the frequency of Boost is too high when the load is light.
However, in the prior art, when the frequency conversion control Boost is switched to a light load or a heavy load or no load, the frequency of the switching tube is difficult to control, and the frequency is too high, which may cause problems of overshoot of the control voltage, damage of the driving circuit and the like.
Disclosure of Invention
In order to solve the problem that the circuit is damaged due to voltage overshoot in the prior art, the application provides a control method of a boost circuit. The application also provides a boost circuit control device.
The application provides a boost circuit control method, which comprises the following steps:
connecting an inductor to the junction capacitance of the first tube and the junction capacitance of the second tube, discharging the junction capacitance of the first tube through an inductor current, and charging the junction capacitance of the second tube;
opening the first tube, switching on the input voltage, and calculating a specific negative value of the inductive current according to the following calculation formula:
Figure 908404DEST_PATH_IMAGE001
wherein fs is a working frequency, Vin is an input voltage, Vo is an output voltage, L is an inductance, and
Figure 330158DEST_PATH_IMAGE002
is a specific negative value;
and when the inductive current drops to the specific negative value, closing the first tube, and resonating the junction capacitor of the first tube, the junction capacitor of the second tube and the inductor by using the inductive current which drops to a preset negative value to enable the voltage of the second tube to drop to zero.
Optionally, the method further includes: the load is switched to light load and then the second tube is opened, achieving a smooth switch to light load.
Optionally, the load is connected in parallel with a current stabilizing capacitor.
Optionally, the first and second tubes comprise: and a triode.
Optionally, the first tube and the second tube are the same triode.
The present application also provides a boost circuit control device, including:
a circuit module, comprising: the junction capacitor of the second tube is used for discharging the junction capacitor of the first tube through inductive current and charging the junction capacitor of the second tube;
the calculation module is used for calculating a specific negative value of the inductive current when the first tube is opened and the input voltage is connected, and the calculation formula is as follows:
Figure 658371DEST_PATH_IMAGE003
wherein fs is a working frequency, Vin is an input voltage, Vo is an output voltage, L is an inductance, and
Figure 532786DEST_PATH_IMAGE002
is a specific negative value;
and the control module is used for closing the first tube when the inductive current drops to the specific negative value, and resonating the junction capacitance of the first tube, the junction capacitance of the second tube and the inductance by using the inductive current which drops to a preset negative value so as to enable the voltage of the second tube to drop to zero.
Optionally, the method further includes: the load is switched to light load and then the second tube is opened, achieving a smooth switch to light load.
Optionally, the load is connected in parallel with a current stabilizing capacitor.
Optionally, the first and second tubes comprise: and a triode.
Optionally, the first tube and the second tube are the same triode.
Compared with the prior art, the application has the advantages that:
the application provides a boost circuit control method, which comprises the following steps: connecting an inductor to the junction capacitance of the first tube and the junction capacitance of the second tube, discharging the junction capacitance of the first tube through an inductor current, and charging the junction capacitance of the second tube; opening the first tube, switching on an input voltage, and calculating a specific negative value of the inductive current; and when the inductive current drops to the specific negative value, closing the first tube, and resonating the junction capacitor of the first tube, the junction capacitor of the second tube and the inductor by using the inductive current which drops to a preset negative value to enable the voltage of the second tube to drop to zero. And calculating the lowest negative value of the inductance according to the frequency to be controlled to limit the frequency comparison width so as to realize the frequency limitation.
Drawings
Fig. 1 is a circuit diagram of a booster circuit in the present application.
Fig. 2 is a control flow chart of the booster circuit in the present application.
Fig. 3 is a diagram illustrating the relationship between the inductor current I and the time T in the present application.
Fig. 4 is a schematic diagram of a boost circuit control apparatus according to the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The application provides a boost circuit control method, which comprises the following steps: connecting an inductor to the junction capacitance of the first tube and the junction capacitance of the second tube, discharging the junction capacitance of the first tube through an inductor current, and charging the junction capacitance of the second tube; opening the first tube, switching on an input voltage, and calculating a specific negative value of the inductive current; and when the inductive current drops to the specific negative value, closing the first tube, and resonating the junction capacitor of the first tube, the junction capacitor of the second tube and the inductor by using the inductive current which drops to a preset negative value to enable the voltage of the second tube to drop to zero. And calculating the lowest negative value of the inductance according to the frequency to be controlled to limit the frequency comparison width so as to realize the frequency limitation.
The boost circuit control method described in the present application is mainly implemented in a boost circuit, and the boost circuit related to the present application will be described first.
Fig. 1 is a circuit diagram of a booster circuit in the present application.
Referring to fig. 1, the boost circuit of the present application includes an input power 001, an inductor 002, a junction capacitor 003 of a first tube, a junction capacitor 004 of a second tube, a load 005, and a ballast capacitor 006. The positive electrode of the input power source 001 is connected with the inductor 002, and the inductor 002 is respectively connected with the junction capacitor 003 of the first tube and the junction capacitor 004 of the second tube. The negative electrode of the input power source 001 is connected to the other end of the junction capacitor 004 of the second tube and is connected in parallel with the load 005, and the junction capacitor 003 of the first tube is connected to the other end of the load. The current stabilizing capacitor 006 is connected to the load 005 in parallel, and damage to an electronic device due to over-high impact voltage generated when the circuit is switched on and off can be avoided through the current stabilizing capacitor.
Fig. 2 is a control flow chart of the booster circuit in the present application.
Referring to fig. 2, in S101, an inductor is connected to the junction capacitor 003 of the first tube and the junction capacitor 004 of the second tube, and the junction capacitor 003 of the first tube is discharged and the junction capacitor 004 of the second tube is charged by an inductor current.
In this application, the transistor is preferably a triode, and the junction capacitance of the transistor refers to the capacitance connected in parallel to the triode, and further, the first transistor and the second transistor are the same triode.
Fig. 3 is a diagram illustrating the relationship between the inductor current I and the time T in the present application.
Referring to fig. 3, when the input inductor current discharges the junction capacitor 003 of the first transistor and charges the junction capacitor 004 of the second transistor, t is the period0~t1The inductor current starts to rise and then turns back down.
With continued reference to fig. 2, S102 opens the first tube, and turns on the input voltage to calculate a specific negative value of the inductor current.
Referring to FIG. 3, when the first tube is opened, the stage is t1~t2The inductor current starts to decrease linearly and in the process reaches a certain negative current value, making the negative current a certain negative value.
In this application, the junction capacitor 003 of the first tube is discharged, and the junction capacitor 004 of the second tube is charged, so that the first step of the control mechanism is completed, and the second step of the control mechanism is to calculate a specific negative value of the inductive current according to the requirement of the load, wherein the specific negative value refers to a negative current.
Specifically, the specific negative value is calculated by using known input voltage, output voltage, inductance and current operating frequency, which can be obtained by reading attribute parameters of the relevant device or by using a test table.
Firstly, the working frequency fs, the input voltage Vin, the output voltage Vo and the inductor L are obtained. The calculation is carried out according to the parameters, and the formula adopted by the calculation is as follows:
equation 1:
Figure 237437DEST_PATH_IMAGE004
equation 2:
Figure 513698DEST_PATH_IMAGE005
equation 3:
Figure 747233DEST_PATH_IMAGE006
and fusing the formula 1, the formula 2 and the formula 3 to obtain the following formula 4:
Figure 374523DEST_PATH_IMAGE007
transforming equation 4 yields equation 5:
Figure 882865DEST_PATH_IMAGE008
in the above formula, the
Figure 774817DEST_PATH_IMAGE009
And
Figure 179253DEST_PATH_IMAGE010
intermediate values are to be understood. According to the calculation and conversion steps of the formula, the currently required specific negative value can be calculated, and the specific negative value is calculated according to the working frequency fs
Figure 28261DEST_PATH_IMAGE002
。
As shown in fig. 2, in step S103, when the inductive current decreases to the specific negative value, the first tube is turned off, and the junction capacitor 003 of the first tube, the junction capacitor 004 of the second tube, and the inductor 002 are resonated by the inductive current decreasing to the preset negative value, so that the voltage of the second tube decreases to zero.
When the inductor current continuously drops to a certain negative value as shown in the stages t 2-t 3 in fig. 3, the first tube is turned off, and the inductor current will resonate the junction capacitance 003 of the first tube, the junction capacitance 004 of the second tube and the inductor 002, so that the voltage drop of the second tube is 0.
After the control process, the load can be switched to the light load, and the switching at the moment is performed when the voltage of the second tube is 0, so that the stable switching from the heavy load to the light load can be realized.
The present application also provides a boost circuit control device, including:
a circuit module, comprising: the junction capacitor of the second tube is used for discharging the junction capacitor of the first tube through inductive current and charging the junction capacitor of the second tube; the calculation module is used for calculating a specific negative value of the inductive current when the first tube is opened and the input voltage is connected; and the control module is used for closing the first tube when the inductive current drops to the specific negative value, and resonating the junction capacitance of the first tube, the junction capacitance of the second tube and the inductance by using the inductive current which drops to a preset negative value so as to enable the voltage of the second tube to drop to zero.
Fig. 4 is a schematic diagram of a boost circuit control apparatus according to the present application.
Referring to fig. 4, the circuit module 201 includes: and the junction capacitor of the second tube is used for discharging the junction capacitor of the first tube through inductive current and charging the junction capacitor of the second tube.
Referring to fig. 1, the boost circuit of the present application includes an input power 001, an inductor 002, a junction capacitor 003 of a first tube, a junction capacitor 004 of a second tube, a load 005, and a ballast capacitor 006. The positive electrode of the input power source 001 is connected with the inductor 002, and the inductor 002 is respectively connected with the junction capacitor 003 of the first tube and the junction capacitor 004 of the second tube. The negative electrode of the input power source 001 is connected to the other end of the junction capacitor 004 of the second tube and is connected in parallel with the load 005, and the junction capacitor 003 of the first tube is connected to the other end of the load. The current stabilizing capacitor 006 is connected to the load 005 in parallel, and damage to an electronic device due to over-high impact voltage generated when the circuit is switched on and off can be avoided through the current stabilizing capacitor.
In this application, the transistor is preferably a triode, and the junction capacitance of the transistor refers to the capacitance connected in parallel to the triode, and further, the first transistor and the second transistor are the same triode.
Fig. 3 is a diagram illustrating the relationship between the inductor current I and the time T in the present application.
Referring to fig. 3, when the input inductor current discharges the junction capacitor 003 of the first transistor and charges the junction capacitor 004 of the second transistor, t is the period0~t1The inductor current starts to rise and then turns back down.
Referring to fig. 4, the calculating module 202 is configured to calculate a specific negative value of the inductor current when the first transistor is turned on and the input voltage is turned on.
Referring to FIG. 3, when the first tube is opened, the stage is t1~t2The inductor current starts to decrease linearly and in the process reaches a certain negative current, making it a certain negative value.
In this application, the junction capacitor 003 of the first tube is discharged, and the junction capacitor 004 of the second tube is charged, so that the first step of the control mechanism is completed, and the second step of the control mechanism is to calculate a specific negative value of the inductive current according to the requirement of the load, wherein the specific negative value refers to a negative current.
Specifically, the specific negative value is calculated by using known input voltage, output voltage, inductance and current operating frequency, which can be obtained by reading attribute parameters of the relevant device or by using a test table.
Firstly, the working frequency fs, the input voltage Vin, the output voltage Vo and the inductor L are obtained. The calculation is carried out according to the parameters, and the formula adopted by the calculation is as follows:
equation 1:
Figure 809135DEST_PATH_IMAGE011
equation 2:
Figure 325567DEST_PATH_IMAGE005
equation 3:
Figure 900905DEST_PATH_IMAGE006
and fusing the formula 1, the formula 2 and the formula 3 to obtain the following formula 4:
Figure 237208DEST_PATH_IMAGE012
transforming equation 4 yields equation 5:
Figure 556194DEST_PATH_IMAGE001
in the above formula, the
Figure 927133DEST_PATH_IMAGE009
And
Figure 673372DEST_PATH_IMAGE010
intermediate values are to be understood. According to the calculation and conversion steps of the formula, the currently required specific negative value can be calculated, and the specific negative value is calculated according to the working frequency fs
Figure 231392DEST_PATH_IMAGE002
。
Referring to fig. 4, the control module 203 is configured to turn off the first tube when the inductor current decreases to the specific negative value, and resonate the junction capacitance of the first tube, the junction capacitance of the second tube, and the inductance by using the inductor current decreasing to a preset negative value, so that the voltage of the second tube decreases to zero.
When the inductor current continuously drops to a certain negative value as shown in the stages t 2-t 3 in fig. 3, the first tube is turned off, and the inductor current will resonate the junction capacitance 003 of the first tube, the junction capacitance 004 of the second tube and the inductor 002, so that the voltage drop of the second tube is 0.
After the control process, the load can be switched to the light load, and the switching at the moment is performed when the voltage of the second tube is 0, so that the stable switching from the heavy load to the light load can be realized.

Claims (10)

1. A method of controlling a boost circuit, comprising:
connecting an inductor to the junction capacitance of the first tube and the junction capacitance of the second tube, discharging the junction capacitance of the first tube through an inductor current, and charging the junction capacitance of the second tube;
opening the first tube, switching on the input voltage, and calculating a specific negative value of the inductive current according to the following calculation formula:
Figure DEST_PATH_IMAGE001
wherein fs is a working frequency, Vin is an input voltage, Vo is an output voltage, L is an inductance, and
Figure 834931DEST_PATH_IMAGE002
is a specific negative value;
and when the inductive current drops to the specific negative value, closing the first tube, and resonating the junction capacitor of the first tube, the junction capacitor of the second tube and the inductor by using the inductive current which drops to a preset negative value to enable the voltage of the second tube to drop to zero.
2. The booster circuit control method according to claim 1, further comprising: the load is switched to light load and then the second tube is opened, achieving a smooth switch to light load.
3. The method of claim 2, wherein the load is connected in parallel with a ballast capacitor.
4. The booster circuit control method according to claim 1, wherein the first pipe and the second pipe include: and a triode.
5. The method of claim 4, wherein the first and second transistors are the same transistor.
6. A boost circuit control apparatus, comprising:
a circuit module, comprising: the junction capacitor of the second tube is used for discharging the junction capacitor of the first tube through inductive current and charging the junction capacitor of the second tube;
the calculation module is used for calculating a specific negative value of the inductive current when the first tube is opened and the input voltage is connected, and the calculation formula is as follows:
Figure 461084DEST_PATH_IMAGE003
wherein fs is a working frequency, Vin is an input voltage, Vo is an output voltage, L is an inductance, and
Figure 379362DEST_PATH_IMAGE002
is a specific negative value;
and the control module is used for closing the first tube when the inductive current drops to the specific negative value, and resonating the junction capacitance of the first tube, the junction capacitance of the second tube and the inductance by using the inductive current which drops to a preset negative value so as to enable the voltage of the second tube to drop to zero.
7. The booster circuit control device according to claim 6, further comprising: the load is switched to light load and then the second tube is opened, achieving a smooth switch to light load.
8. The boost circuit control device of claim 7, wherein the load is connected in parallel with a ballast capacitor.
9. The booster circuit control device according to claim 6, wherein the first pipe and the second pipe include: and a triode.
10. The boost-circuit control device of claim 7, wherein the first and second transistors are identical transistors.
CN202111577484.2A 2021-12-22 2021-12-22 Boost circuit control method and device Pending CN113949270A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114123739A (en) * 2022-01-25 2022-03-01 常州索维尔电子科技有限公司 Soft switch frequency conversion control circuit, method, device and equipment based on bridge type MOSFET

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008035641A (en) * 2006-07-28 2008-02-14 Fuji Electric Device Technology Co Ltd Control circuit of dc-dc converter and method thereof
CN106411125A (en) * 2016-11-14 2017-02-15 江苏由甲申田新能源科技有限公司 DC-DC converted soft switch circuit and control method thereof
CN107924208A (en) * 2015-08-04 2018-04-17 高通股份有限公司 Switching regulaor current sensing circuit and method
CN111953198A (en) * 2020-07-31 2020-11-17 南京航空航天大学 Full-range ZVS (zero voltage switching) implementation method for totem-pole PFC (Power factor correction) converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008035641A (en) * 2006-07-28 2008-02-14 Fuji Electric Device Technology Co Ltd Control circuit of dc-dc converter and method thereof
CN107924208A (en) * 2015-08-04 2018-04-17 高通股份有限公司 Switching regulaor current sensing circuit and method
CN106411125A (en) * 2016-11-14 2017-02-15 江苏由甲申田新能源科技有限公司 DC-DC converted soft switch circuit and control method thereof
CN111953198A (en) * 2020-07-31 2020-11-17 南京航空航天大学 Full-range ZVS (zero voltage switching) implementation method for totem-pole PFC (Power factor correction) converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114123739A (en) * 2022-01-25 2022-03-01 常州索维尔电子科技有限公司 Soft switch frequency conversion control circuit, method, device and equipment based on bridge type MOSFET
CN114123739B (en) * 2022-01-25 2022-04-15 常州索维尔电子科技有限公司 Soft switch frequency conversion control circuit, method, device and equipment based on bridge type MOSFET

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