CN207994948U - A kind of three level Buck converters - Google Patents
A kind of three level Buck converters Download PDFInfo
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- CN207994948U CN207994948U CN201820285544.0U CN201820285544U CN207994948U CN 207994948 U CN207994948 U CN 207994948U CN 201820285544 U CN201820285544 U CN 201820285544U CN 207994948 U CN207994948 U CN 207994948U
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- capacitance
- pid controller
- level buck
- buck converters
- filter inductance
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Abstract
The utility model discloses a kind of three level Buck converters, including first resistor RS1, second resistance RS2, first MOSFET pipes Q1, the 2nd MOSFET pipes Q2, first filter inductance L1, the second filter inductance L2, first capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the first diode D1 and the second diode D2.The utility model can reduce MOSFET pipes, diode electric stress, enhance parts selection versatility, reduce cost, less filter inductance, capacitance volume；The utility model can realize that three level Buck converter voltages and electric current stablize output under high voltage direct current input, have preferable dynamic response characteristic, system robustness；The utility model uses neutral balance control program, controls automatic adjustment input capacitance by loop completely and presses.
Description
Technical field
The utility model is related to converters technical fields, in particular to three level Buck of one kind becomes
Parallel operation.
Background technology
With the fast development of industrial electrical equipment, high input voltage, the converters demand of low pressure output are more next
More, commonly used topology is Buck converters, but the Buck converters of the prior art are needed in high input voltage
The MOSFET pipes for selecting electric stress very high could meet its requirement with diode, sufficiently bulky filter inductance and filter capacitor,
Accordingly, there exist parts selection poor universality, of high cost, filter inductance and filter capacitor volume are big the shortcomings of.
Drawbacks described above is worth improving.
Invention content
In order to overcome the shortcomings of that existing technology, the utility model provide a kind of three level Buck converters.
Technical solutions of the utility model are as described below：
A kind of three level Buck converters, including first resistor RS1, second resistance RS2, the first MOSFET pipes Q1, second
MOSFET pipes Q2, the first filter inductance L1, the second filter inductance L2, the first capacitance C1, the second capacitance C2, third capacitance C3,
Four capacitance C4, the first diode D1 and the second diode D2；
The first resistor RS1, the first MOSFET pipes Q1 and the first filter inductance L1 are sequentially connected in series, described
Second resistance RS2, the 2nd MOSFET pipes Q2 and the second filter inductance L2 are sequentially connected in series, the first resistor RS1
The termination one end the first capacitance C1 be connected, termination described one end second capacitance C2 phase of the second resistance RS2
Connection, the first capacitance C1 other ends are commonly connected to E points with the second capacitance C2 other ends；
The source electrode of the first MOSFET pipes Q1 and described one end first filter inductance L1 and the first diode D1
Cathode be connected, the drain electrode of the 2nd MOSFET pipes Q2 and described one end second filter inductance L2 and the two or two pole
The anode of pipe D2 is connected, and the anode of the first diode D1 and the cathode of the second diode D2 are commonly connected to F points；
One end of the first filter inductance L1 is connected with one end of the third capacitance C3, second filter inductance
One end of L2 is connected with one end of the 4th capacitance C4, and the other end of the third capacitance C3 is with the 4th capacitance C4's
The other end connects and G points jointly；
The E points, F points and G points are sequentially connected and connect；
The both ends of the first capacitance C1 are connect with input forward voltage Uin+；The both ends of the second capacitance C2 and input
Negative voltage Uin- connections.
Further, the first resistor RS1 and second resistance RS2 is sampling resistor or first electricity
The resistance RS1 and second resistance RS2 is hall device or the first resistor RS1 and the second resistance RS2 is mutual
Sensor.
Further, digital PWM modulators, the digital PWM modulators are provided on the three level Buck converters
It is connect with PID controller.
Further, the digital PWM modulators include the first digital PWM modulators and the second digital PWM modulators,
The PID controller includes the first PID controller, the second PID controller, third PID controller and the 4th PID controller；
The input terminal of first PID controller is connect with reference voltage Uout_ref and output voltage Vout respectively,
The input terminal of the third PID controller is connect with the forward voltage Uin+ and the negative voltage Uin- respectively, described
The input terminal of second PID controller respectively with the output end of first PID controller, the third PID controller
Output end and voltage IRs1 connections, the output end of second PID controller are connect with first digital PWM modulators；
The input terminal of 4th PID controller respectively with the output end of first PID controller, the third
The output end of PID controller and voltage IRs2 connections, output end and second digital PWM of the 4th PID controller
Modulator connects.
Further, the electric current in the voltage IRs1 is the electric current exported in forward current Iuot+, the voltage IRs2
To export reverse current Iuot-.
Further, the forward direction of the output end of first digital PWM modulators and the three level Buck converters
Buck connections；The output end of second digital PWM modulators is connect with the negative sense Buck of the three level Buck converters.
Further, the three level Buck converters are believed by the output PWM modulation of first digital PWM modulators
The make-and-break time of number control the first MOSFET pipes Q1, the three level Buck converters pass through the second digital PWM tune
The output PWM modulation signal of device processed controls the make-and-break time of the 2nd MOSFET pipes Q2.
According to the utility model of said program, advantage is, the utility model can make MOSFET pipes, two poles
The electric stress of pipe halves, and parts selection versatility is preferable, reduces device cost, reduces filter inductance and filtered electrical volume
Product, the utility model are adjusted using multiple PID controller closed loops, are had preferable dynamic response characteristic, system robustness, are passed through
Rationally adjustment Control PID controller parameter, the PWM driving duty ratios for making the PWM of positive Buck drive duty ratio with negative sense Buck
It is dynamically equal, it can preferably realize that three level Buck converter voltages and electric current stablize output under high voltage direct current input, this
Utility model uses neutral balance control program, and acquisition input terminal two capacitances Vin+, Vin- do PID control adjusting, in output
Point balance factor, be added to current regulator road, realizes adjust automatically forward direction Buck, negative sense Buck duty ratios, preferable real
Now input Vin+, Vin- presses regulatory function.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the fundamental diagram of the utility model.
Specific implementation mode
Below in conjunction with the accompanying drawings and the utility model is further described in embodiment：
As shown in Figure 1, including first resistor RS1, second resistance RS2, the first MOSFET pipes Q1, the 2nd MOSFET pipe Q2,
First filter inductance L1, the second filter inductance L2, the first capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the
One diode D1 and the second diode D2, first resistor RS1, second resistance RS2 be current signal measurement device, described first
The resistance RS1 and second resistance RS2 is sampling resistor or the first resistor RS1 and the second resistance RS2 is
Hall device or the first resistor RS1 and the second resistance RS2 are mutual inductor；
The first resistor RS1, the first MOSFET pipes Q1 and the first filter inductance L1 are sequentially connected in series, described
Second resistance RS2, the 2nd MOSFET pipes Q2 and the second filter inductance L2 are sequentially connected in series, the first resistor RS1
One end be connected with described one end first capacitance C1, and one end of the first resistor RS1 and described one end first capacitance C1
Connect forward voltage；One end of the second resistance RS2 is connected with described one end second capacitance C2, and the second resistance RS2
One end and the second capacitance C2 mono- terminate negative voltage, the first capacitance C1 other ends and the second capacitance C2 are another
End is commonly connected to E points；
The source electrode of the first MOSFET pipes Q1 and described one end first filter inductance L1 and the first diode D1
Cathode be connected, the drain electrode of the 2nd MOSFET pipes Q2 and described one end second filter inductance L2 and the two or two pole
The anode of pipe D2 is connected, and the anode of the first diode D1 and the cathode of the second diode D2 are commonly connected to F points；
One end of the first filter inductance L1 is connected with one end of the third capacitance C3, second filter inductance
One end of L2 is connected with one end of the 4th capacitance C4, and the other end of the third capacitance C3 is with the 4th capacitance C4's
The other end connects and G points jointly；The E points, F points and G points are sequentially connected and connect；
The both ends of the first capacitance C1 are connect with input forward voltage Uin+；The both ends of the second capacitance C2 and input
Negative voltage Uin- connections.
It is provided with digital PWM modulators, the digital PWM modulators and PID control on the three level Buck converters
Device connects, and the digital PWM modulators include the first digital PWM modulators and the second digital PWM modulators, the PID controls
Device processed includes the first PID controller, the second PID controller, third PID controller and the 4th PID controller.
The input terminal of first PID controller is connect with reference voltage Uout_ref and output voltage Vout respectively,
The input terminal of the third PID controller is connect with forward voltage Uin+, negative voltage Uin- respectively, second PID control
The input terminal of device respectively with the output end of first PID controller, the output end and electricity of the third PID controller
IRs1 connections, the output end of second PID controller is pressed to be connect with first digital PWM modulators, first number
The output end of PWM modulator is connect with the positive Buck of the three level Buck converters, and the three level Buck converters are logical
The output PWM modulation signal for crossing first digital PWM modulators controls the make-and-break time of the first MOSFET pipes Q1；
The input terminal of 4th PID controller respectively with the output end of first PID controller, the third
The output end of PID controller and voltage IRs2 connections, output end and second digital PWM of the 4th PID controller
Modulator connects, and the output end of second digital PWM modulators is connect with the negative sense Buck of the three level Buck converters,
The three level Buck converters control described second by the output PWM modulation signal of second digital PWM modulators
The make-and-break time of MOSFET pipes Q2.
As shown in Fig. 2, the operation principle of the utility model：
1）, digital control chip gives reference voltage Uout_ref, acquisition output voltage Vout makees first after calculating error
The control operation of PID controller, output controlled quentity controlled variable Uout_pid；
2）, digital control chip acquisition input forward voltage Uin+, input negative voltage Uin- make third after calculating error
The control operation of PID controller, output controlled quentity controlled variable Ur_pid, Ur_pid are pressed as the first capacitance C1 of control, the second capacitance C2
Controlling elements are positive value when input forward voltage Uin+ is more than input negative voltage Uin-, Ur_pid, when input forward voltage
It is negative that Uin+, which is more than input negative voltage Uin-, Ur_pid,；By detecting the first capacitance C1 both end voltages Uin+ and detection
Second capacitance C2 both end voltages Uin- does PID control adjusting, exports neutral balance factor Ur_pid, be added to the 2nd PID respectively
In the reference signal of controller and the 4th PID controller, the first digital PWM modulators and the modulation of the second digital PWM are influenced respectively
Device exports different duty ratios, realizes that input capacitance C1, C2 both end voltage is equal.
3）, digital control chip collection voltages IRs1 and Uout_pid be added with Ur_pid after calculating error, remake second
The control operation of PID controller, output controlled quentity controlled variable Iout1_pid, Iout1_pid are sent into the first digital PWM modulators, generate not
With duty ratio PWM driving forward directions Buck, wherein the electric current in voltage IRs1 is output forward current Iuot+；
4）, digital control chip collection voltages IRs2 and Uout_pid subtract each other with Ur_pid after calculating error, remake the 4th
The control operation of PID controller, output controlled quentity controlled variable Iout2_pid, Iout2_pid are sent into digital second PWM modulator, and generation is not
With duty ratio PWM driving negative senses Buck, wherein the electric current in voltage IRs2 is output reverse current Iuot-.
PWM modulator includes the first digital PWM modulators, the second digital PWM modulators, the first digital PWM modulators control
The first MOSFET pipe Q1 make-and-break times of forward direction Buck are made, the second digital PWM modulators control the 2nd MOSFET pipes Q2 of negative sense Buck
Make-and-break time.
The utility model can be such that the electric stress of MOSFET pipes, diode halves, and parts selection versatility is preferable, reduces
Device cost reduces filter inductance and filter capacitor volume, and the utility model is adjusted using multiple PID controller closed loops, tool
There are preferable dynamic response characteristic, system robustness, by rationally adjusting Control PID controller parameter, makes the PWM of positive Buck
It drives duty ratio equal with the PWM of negative sense Buck driving duty ratio dynamics, can preferably realize three under high voltage direct current input
Level Buck converter voltages and electric current stablize output, and the utility model uses neutral balance control program, acquires input terminal two
A capacitance Vin+, Vin- do PID control adjusting, export the neutral balance factor, and be added to current regulator road, realizes automatic adjust
Whole forward direction Buck, negative sense Buck duty ratios, it is preferable to realize that input Vin+, Vin- press regulatory function.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.
Illustrative description is carried out to the utility model patent above in conjunction with attached drawing, it is clear that the reality of the utility model patent
Now be not subject to the restrictions described above, if use the utility model patent methodology and technical solution carry out it is various
Improve, or it is not improved the design of the utility model patent and technical solution are directly applied into other occasions, in this reality
With in novel protection domain.
Claims (7)
1. a kind of three level Buck converters, which is characterized in that including first resistor RS1, second resistance RS2, the first MOSFET
Pipe Q1, the 2nd MOSFET pipe Q2, the first filter inductance L1, the second filter inductance L2, the first capacitance C1, the second capacitance C2, third
Capacitance C3, the 4th capacitance C4, the first diode D1 and the second diode D2；
The first resistor RS1, the first MOSFET pipes Q1 and the first filter inductance L1 are sequentially connected in series, and described second
Resistance RS2, the 2nd MOSFET pipes Q2 and the second filter inductance L2 are sequentially connected in series, and the one of the first resistor RS1
Described one end first capacitance C1 is terminated to be connected, termination one end the second capacitance C2 of the second resistance RS2 is connected,
The first capacitance C1 other ends are commonly connected to E points with the second capacitance C2 other ends；
The source electrode of the first MOSFET pipes Q1 and the moon of described one end first filter inductance L1 and the first diode D1
Pole is connected, the drain electrode of the 2nd MOSFET pipes Q2 and described one end second filter inductance L2 and the second diode D2
Anode be connected, the cathode of the anode of the first diode D1 and the second diode D2 are commonly connected to F points；
One end of the first filter inductance L1 is connected with one end of the third capacitance C3, the second filter inductance L2's
One end is connected with one end of the 4th capacitance C4, and the other end of the third capacitance C3 is another with the 4th capacitance C4's
End is commonly connected to G points；
The E points, F points and G points are sequentially connected and connect；
The both ends of the first capacitance C1 are connect with input forward voltage Uin+；The both ends of the second capacitance C2 and input negative sense
Voltage Uin- connections.
2. three level Buck converters according to claim 1, which is characterized in that the first resistor RS1 and described
Second resistance RS2 is sampling resistor or the first resistor RS1 and the second resistance RS2 is hall device, Huo Zhesuo
It is mutual inductor to state the first resistor RS1 and second resistance RS2.
3. three level Buck converters according to claim 1, which is characterized in that set on the three level Buck converters
Digital PWM modulators are equipped with, the digital PWM modulators are connect with PID controller.
4. three level Buck converters according to claim 3, which is characterized in that the digital PWM modulators include the
One digital PWM modulators and the second digital PWM modulators, the PID controller include the first PID controller, the 2nd PID controls
Device, third PID controller and the 4th PID controller processed；
The input terminal of first PID controller is connect with reference voltage Uout_ref and output voltage Vout respectively, described
The input terminal of third PID controller is connect with the forward voltage Uin+ and the negative voltage Uin- respectively, and described second
The input terminal of PID controller respectively with the output end of the output end of first PID controller, the third PID controller with
And voltage IRs1 connections, the output end of second PID controller are connect with first digital PWM modulators；
The input terminal of 4th PID controller respectively with the output end of first PID controller, the third PID control
The output end of device and voltage IRs2 connections, output end and second digital PWM modulators of the 4th PID controller connect
It connects.
5. three level Buck converters according to claim 4, which is characterized in that the electric current in the voltage IRs1 is defeated
The electric current gone out in forward current Iuot+, the voltage IRs2 is output reverse current Iuot-.
6. three level Buck converters according to claim 4, which is characterized in that first digital PWM modulators
Output end is connect with the positive Buck of the three level Buck converters；The output end of second digital PWM modulators and institute
State the negative sense Buck connections of three level Buck converters.
7. three level Buck converters according to claim 6, which is characterized in that the three level Buck converters pass through
The output PWM modulation signal of first digital PWM modulators controls the make-and-break time of the first MOSFET pipes Q1, and described three
Level Buck converters control the 2nd MOSFET by the output PWM modulation signal of second digital PWM modulators and manage
The make-and-break time of Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820285544.0U CN207994948U (en) | 2018-03-01 | 2018-03-01 | A kind of three level Buck converters |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820285544.0U CN207994948U (en) | 2018-03-01 | 2018-03-01 | A kind of three level Buck converters |
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| CN207994948U true CN207994948U (en) | 2018-10-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114888373A (en) * | 2022-06-01 | 2022-08-12 | 南京理工大学 | Three-level BUCK pulse power supply for electric spark machining |
-
2018
- 2018-03-01 CN CN201820285544.0U patent/CN207994948U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114888373A (en) * | 2022-06-01 | 2022-08-12 | 南京理工大学 | Three-level BUCK pulse power supply for electric spark machining |
| CN114888373B (en) * | 2022-06-01 | 2023-09-29 | 南京理工大学 | Three-level BUCK pulse power supply for electric spark machining |
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