CN107171553A - A kind of BUCK converter circuits - Google Patents
A kind of BUCK converter circuits Download PDFInfo
- Publication number
- CN107171553A CN107171553A CN201710529631.6A CN201710529631A CN107171553A CN 107171553 A CN107171553 A CN 107171553A CN 201710529631 A CN201710529631 A CN 201710529631A CN 107171553 A CN107171553 A CN 107171553A
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- Prior art keywords
- buck
- voltage
- circuit
- current
- circuits
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Classifications
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to a kind of BUCK converter circuits, belong to technical field of electronic products, it includes：Direct-current input power supplying, to provide input supply voltage；BUCK circuits, line translation is entered to direct-current input power supplying voltage；Bootstrap startup circuit, starts during to initial power-on to controller；PWM controller, to produce pwm control signal driving main circuit；Current feedback circuit, to be sampled to the electric current in circuit, sends into PWM controller；Voltage feedback circuit, to be sampled to output voltage, sends into PWM controller；The voltage of sampling and the inductive current of sampling are received by the PWM controller, and controls cut-offfing for BUCK circuits so that the voltage of BUCK circuit outputs reaches predetermined stationary value.The BUCK converter circuits of the present invention are compared with existing BUCK converters, without using isolation optocoupler chip；Without using reference voltage chip；The cost and volume of circuit are reduced to a certain extent.
Description
Technical field
The invention belongs to technical field of electronic products, more particularly to a kind of split door design method.
Background technology
In fields such as computer, communication, Industry Control, instrument and meter, Medical Devices, using BUCK (decompression) converter electricity
Road design from HVDC transform to low-voltage direct Switching Power Supply application widely.It is big especially as some
In terms of the accessory power supply of power power-supply, most of is all to use BUCK circuits.Yet with BUCK circuit drives relative to defeated
It is to float with going out, voltage sample is needed by an isolation optocoupler and a voltage reference combination of transmitted to electric in the prior art
Road control chip.
Existing BUCK converter circuits as shown in Figure 1 include:Direct-current input power supplying is to provide input supply voltage；
BUCK circuits, line translation is entered to input supply voltage；Bootstrap startup circuit, starts during to initial power-on to controller；
Pwm control circuit, to produce PWM driving voltages；Current feedback circuit, to be sampled to the electric current in circuit, feeding
PWM controller；Voltage feedback circuit, to be sampled to output voltage, sends into PWM controller；But existing voltage is anti-
Current feed circuit is made up of isolation optocoupler and voltage reference etc., but the major defect of the voltage feedback circuit of this form is due to make
With isolation optocoupler and voltage reference, cause complicated, cost higher.
The content of the invention
It is an object of the invention to provide a kind of BUCK converter circuits, it is intended to reduces the complexity of existing BUCK circuits, subtracts
Low cost.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：A kind of BUCK converter circuits, it includes
Direct-current input power supplying, the direct-current input power supplying is used for the supply voltage for providing input；
BUCK circuits, the BUCK circuits are connected with direct-current input power supplying, for entering to the DC output power voltage
Row transformation；
Bootstrap startup circuit, the bootstrap startup circuit is connected with the direct-current input power supplying, for starting PWM controls
Device；
PWM controller, the PWM controller is connected with bootstrap startup circuit, for controlling cut-offfing for BUCK circuits；
Voltage feedback circuit, the voltage feedback circuit is connected with BUCK circuits, for the voltage to BUCK circuit outputs
Sampling；
Current feedback circuit, the current feedback circuit is connected with BUCK circuits, for the inductance electricity in BUCK circuits
Stream sampling；
The voltage of sampling and the inductive current of sampling are received by the PWM controller, and controls cut-offfing for BUCK circuits,
So that the voltage of BUCK circuit outputs reaches predetermined stationary value.
Further, the BUCK circuits include switching tube Q1, energy storage inductor L1, sustained diode 1, filter capacitor
Cout and load resistance RL, if the ground of controller is datum, direct-current input power supplying VIN negative pole is grounded, the connection of its positive pole
Switching tube Q1 drain electrode, switching tube Q1 source class connection sampling resistor Rs one end, sampling resistor Rs other end connection energy storage
Inductance L1 one end, energy storage inductor L1 other end connection filter capacitor Cout anode, filter capacitor Cout another termination
Ground, the plus earth of sustained diode 1, negative electrode connect datum.
Further, the voltage feedback circuit includes charging diode D3, partial pressure sample resistance R3 and partial pressure sampling electricity
R4 and filter capacitor C3 is hindered, charging diode D3 positive pole is connected with the output voltage of BUCK circuits, charging diode D3's
Negative pole is connected with partial pressure sample resistance R3 and filter capacitor C3 respectively, and the partial pressure sample resistance R3 other ends sample electricity with partial pressure respectively
Hinder the pressure feedback port connection of R4 and PWM controller, partial pressure sample resistance R3 and filter capacitor C3 connections and be connected to BUCK electricity
The energy storage inductor L1 on road and the connection end of sustained diode 1.
Further, shown partial pressure sample resistance R3 and partial pressure sample resistance R4 is sampled for partial pressure.
Further, the bootstrap startup circuit includes current-limiting resistance R1, start-up capacitance C1 and charging diode D2, it is defeated
Enter power supply VIN anode connection current-limiting resistance R1 one end, current-limiting resistance R1 other end connection start-up capacitance C1 positive pole is opened
Dynamic condenser C1 negative pole connects reference point and put down, and charging diode D2 anode connects filter capacitor Cout positive pole, charging diode D2
Negative electrode connect start-up capacitance C1 positive pole, start-up capacitance C1 positive pole connects PWM controller.
Further, the current feedback circuit includes the filtered electrical that sampling resistor Rs and resistance R2 and electric capacity C2 is constituted
Road, sampling resistor Rs one end connection resistance R2 one end, resistance R2 another termination capacitor C2, and PWM controller is accessed, electricity
Hold C2 another termination datum.
Further, by adjusting the parameter of resistance in circuit so that the voltage of BUCK circuit outputs reaches predetermined stabilization
Value.
The BUCK converter circuits of the present invention are compared with existing BUCK converters, without using isolation optocoupler chip；Do not make
Use reference voltage chip；The cost and volume of circuit are reduced to a certain extent.In addition, the BUCK converters of the present invention may be used also
Apply the occasion for being higher than output voltage in input voltage.
Brief description of the drawings
Accompanying drawing herein is merged in specification and constitutes the part of this specification, shows the implementation for meeting the present invention
Example, and for explaining principle of the invention together with specification.
Fig. 1 is the BUCK converter circuit figures of prior art.
Fig. 2 is the BUCK converter circuit structural representations of one embodiment of the invention.
Fig. 3 is the BUCK converter circuit line maps of one embodiment of the invention.
Embodiment
To make the purpose, technical scheme and advantage of the invention implemented clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.
BUCK converter circuit structural representations as shown in Figure 2, BUCK converter circuits of the invention include：Direct current is defeated
Enter power supply, the direct-current input power supplying is used to provide input supply voltage；BUCK circuits, the BUCK circuits input electricity with direct current
Source is connected, and the supply voltage for being exported to the DC output power carries out transformation；Bootstrap startup circuit, the boot loader
Circuit is connected with the direct-current input power supplying, the startup for controlling PWM controller in circuit initial power-on；PWM controller,
The PWM controller is connected with bootstrap startup circuit, and producing PWM driving voltages is used to control cut-offfing for BUCK circuits；Voltage is anti-
Current feed circuit, the voltage feedback circuit is connected with BUCK circuits, for the voltage sample to BUCK circuit outputs, and will be sampled
The voltage feeding PWM controller arrived；Current feedback circuit, the current feedback circuit is connected with BUCK circuits, for BUCK
Inductive current sampling in circuit, and the electric current that sampling is obtained sends into PWM controller；Received and adopted by the PWM controller
The voltage of sample and the inductive current of sampling, and control cut-offfing for BUCK circuits so that the voltage of BUCK circuit outputs reaches predetermined
Stationary value.
BUCK converter circuit line maps as shown in Figure 3, wherein, BUCK circuits include a switching tube Q1, a storage
Can inductance L1, a sustained diode 1, a filter capacitor Cout and a load resistance RL.If the ground of controller is reference
Level, direct-current input power supplying VIN negative pole ground connection, its positive pole connecting valve pipe Q1 drain electrode, switching tube Q1 source class connection is adopted
Sample resistance Rs one end, sampling resistor Rs other end connection energy storage inductor L1 one end (i.e. datum), energy storage inductor L1
Other end connection filter capacitor Cout anode, filter capacitor Cout other end ground connection, the anode of sustained diode 1 connects
Ground, negative electrode connect datum.
Wherein, bootstrap startup circuit includes current-limiting resistance R1, a start-up capacitance C1 and charging diode D2, input power
VIN anode connection current-limiting resistance R1 one end, current-limiting resistance R1 other end connection start-up capacitance C1 positive pole, start-up capacitance
C1 negative pole connects reference point and put down, and charging diode D2 anode connects filter capacitor Cout positive pole, charging diode D2 negative electrode
Start-up capacitance C1 positive pole is connect, start-up capacitance C1 positive pole connects PWM controller U1 VCC ends.
Wherein, current feedback circuit includes a sampling resistor Rs and a filtered electrical being made up of resistance R2, electric capacity C2
Road, sampling resistor Rs one end connection resistance R2 one end, resistance R2 another termination capacitor C2, and access PWM controller U1
Is ends, electric capacity C2 another termination datum.
Wherein, voltage feedback circuit includes charging diode D3, a filter capacitor C3 and partial pressure sample resistance R3
And partial pressure sample resistance R4, charging diode D3 anode connects filter capacitor Cout positive pole, and charging diode D3 negative electrode connects
Filter capacitor C3 positive pole, filter capacitor C3 negative pole connects datum, and filter capacitor C3 positive pole meets partial pressure sample resistance R3
One end, partial pressure sample resistance R3 another partial pressure sample resistance R4 of another termination one end, partial pressure sample resistance R4's is another
Terminate datum, partial pressure sample resistance R3, R4 connection end access PWM controller U1 FB ends.
The BUCK converter circuit operation principles of the present invention：As shown in figure 3, during initial power-on, VD VIN leads to
Current-limiting resistance R1 is crossed to charge to start-up capacitance C1, when reaching PWM controller chip U1 cut-in voltage, PWM controller chip
U1 exports the driving voltage of maximum duty cycle by starting, so that controlling switch pipe Q1 turn-on and turn-off, when switching tube Q1 is turned on,
Energy is transferred to energy storage inductor L1 by switching tube, while part energy is transmitted directly to output end, is disconnected in switching tube Q1
When, energy storage inductor L1 transmits energy to output end by afterflow sustained diode 1, at this moment VL (the electricity at energy storage inductor L1 two ends
Pressure) by VA (output voltage) clamper, i.e. VL=VA+VD (VD is diode forward conduction voltage drop), due to PWM controller chip U1
Reference voltage be energy storage inductor L1 one end, so at this moment an energy storage inductor L1 energy part passes through D2 pairs of charging diode
Start-up capacitance C1 chargings are so as to maintain PWM controller chip U1 operating current, on the other hand, and energy storage inductor L1 passes through charging two
Pole pipe D3 charges to filter capacitor C3, VL=VB+VD (VB is the voltage at voltage sampling end), it is known that VA=VB, actual sampling end
Voltage and output voltage it is equal, VB after partial pressure sample resistance R3, R4 partial pressure give pwm control circuit error amplifier feedback
End, resistance R5, electric capacity C4 provide zero pole point compensation.Rs is current sampling resistor, is filtered by resistance R2, electric capacity the C2 RC constituted
Pwm control circuit is given after circuit.PWM controller by adjusting dutycycle more afterwards to sample rate current and sampled voltage so that
Output voltage stabilization.
The BUCK converter circuits of the present invention are compared with existing BUCK converters, without using isolation optocoupler chip；Do not make
Use reference voltage chip；The cost and volume of circuit are reduced to a certain extent.In addition, the BUCK converters of the present invention may be used also
Apply the occasion for being higher than output voltage in input voltage.
It is described above, it is only the optimal embodiment of the present invention, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Enclose and be defined.
Claims (7)
1. a kind of BUCK converter circuits, it is characterised in that the BUCK converter circuits include direct-current input power supplying, described straight
Flow the supply voltage that input power is used to provide input；
BUCK circuits, the BUCK circuits are connected with direct-current input power supplying, for becoming to the DC output power voltage
Pressure；
Bootstrap startup circuit, the bootstrap startup circuit is connected with the direct-current input power supplying, for starting PWM controller；
PWM controller, the PWM controller is connected with bootstrap startup circuit, for controlling cut-offfing for BUCK circuits；
Voltage feedback circuit, the voltage feedback circuit is connected with BUCK circuits, for the voltage sample to BUCK circuit outputs；
Current feedback circuit, the current feedback circuit is connected with BUCK circuits, for being adopted to the inductive current in BUCK circuits
Sample；
The voltage of sampling and the inductive current of sampling are received by the PWM controller, and controls cut-offfing for BUCK circuits so that
The voltage of BUCK circuit outputs reaches predetermined stationary value.
2. BUCK converter circuits according to claim 1, it is characterised in that the BUCK circuits include switching tube Q1,
Energy storage inductor L1, sustained diode 1, filter capacitor Cout and load resistance RL, if the ground of controller is datum, direct current
Input power VIN negative pole ground connection, its positive pole connecting valve pipe Q1 drain electrode, switching tube Q1 source class connection sampling resistor Rs's
One end, sampling resistor Rs other end connection energy storage inductor L1 one end, energy storage inductor L1 other end connection filter capacitor
Cout anode, filter capacitor Cout other end ground connection, the plus earth of sustained diode 1, negative electrode connect datum.
3. BUCK converter circuits according to claim 1, it is characterised in that the voltage feedback circuit includes charging two
Pole pipe D3, partial pressure sample resistance R3 and partial pressure sample resistance R4 and filter capacitor C3, charging diode D3 positive pole and BUCK
The output voltage connection of circuit, charging diode D3 negative pole is connected with partial pressure sample resistance R3 and filter capacitor C3 respectively, point
Pressure feedback port of the sample resistance R3 other ends respectively with partial pressure sample resistance R4 and PWM controller is pressed to be connected, partial pressure sampling electricity
Hinder R3 and filter capacitor C3 connections and be connected to the energy storage inductor L1 of BUCK circuits and the connection end of sustained diode 1.
4. BUCK converter circuits according to claim 3, it is characterised in that shown partial pressure sample resistance R3 and partial pressure take
Sample resistance R4 is sampled for partial pressure.
5. BUCK converter circuits according to claim 3, it is characterised in that the bootstrap startup circuit includes current limliting electricity
R1, start-up capacitance C1 and charging diode D2 are hindered, input power VIN anode connection current-limiting resistance R1 one end, current-limiting resistance
R1 other end connection start-up capacitance C1 positive pole, start-up capacitance C1 negative pole connects reference point and put down, charging diode D2 anode
Filter capacitor Cout positive pole is connect, charging diode D2 negative electrode connects start-up capacitance C1 positive pole, and start-up capacitance C1 positive pole connects
PWM controller.
6. BUCK converter circuits according to claim 5, it is characterised in that the current feedback circuit includes sampling electricity
The filter circuit that Rs and resistance R2 and electric capacity C2 is constituted is hindered, sampling resistor Rs one end connects resistance R2 one end, resistance R2's
Another termination capacitor C2, and access PWM controller, electric capacity C2 another termination datum.
7. BUCK converter circuits according to claim 1, it is characterised in that made by the parameter for adjusting resistance in circuit
The voltage for obtaining BUCK circuit outputs reaches predetermined stationary value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710529631.6A CN107171553A (en) | 2017-07-02 | 2017-07-02 | A kind of BUCK converter circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710529631.6A CN107171553A (en) | 2017-07-02 | 2017-07-02 | A kind of BUCK converter circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107171553A true CN107171553A (en) | 2017-09-15 |
Family
ID=59827387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710529631.6A Pending CN107171553A (en) | 2017-07-02 | 2017-07-02 | A kind of BUCK converter circuits |
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| Country | Link |
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| CN (1) | CN107171553A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448886A (en) * | 2018-04-17 | 2018-08-24 | 华南理工大学 | A kind of Buck converters Bootstrapping drive circuit |
| CN109067209A (en) * | 2018-09-30 | 2018-12-21 | 严添明 | A kind of high-power wide scope adjustable DC linear stabilized power supply |
| CN109510469A (en) * | 2019-01-15 | 2019-03-22 | 广东志成冠军集团有限公司 | A kind of the DC power supply self-start circuit and starting method of high voltage input and low-voltage output |
| CN109617429A (en) * | 2019-02-26 | 2019-04-12 | 晶艺半导体有限公司 | Voltage converter ic, high pressure BUCK converter and control method |
| CN110171018A (en) * | 2019-05-25 | 2019-08-27 | 塞伯睿机器人技术（长沙）有限公司 | Robot motor starts control device |
| CN112713770A (en) * | 2020-12-24 | 2021-04-27 | 潍柴动力股份有限公司 | BUCK converter |
| CN108696126B (en) * | 2018-06-15 | 2024-02-09 | 黎明职业大学 | BUCK drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110068757A1 (en) * | 2009-09-14 | 2011-03-24 | Dialog Seminconductor GmbH | Switching converter having a plurality N of outputs providing N output signals and at least one inductor and method for controlling such a switching converter |
| CN201860261U (en) * | 2010-07-14 | 2011-06-08 | Tcl通力电子（惠州）有限公司 | Boost circuit |
| CN104571433A (en) * | 2013-10-21 | 2015-04-29 | 北京计算机技术及应用研究所 | Vehicular computer power supply and surge voltage suppression method thereof |
| CN106341038A (en) * | 2015-05-22 | 2017-01-18 | 无锡矽瑞微电子股份有限公司 | Constant voltage output switching power supply device with high power factor and control method thereof |
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2017
- 2017-07-02 CN CN201710529631.6A patent/CN107171553A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110068757A1 (en) * | 2009-09-14 | 2011-03-24 | Dialog Seminconductor GmbH | Switching converter having a plurality N of outputs providing N output signals and at least one inductor and method for controlling such a switching converter |
| CN201860261U (en) * | 2010-07-14 | 2011-06-08 | Tcl通力电子（惠州）有限公司 | Boost circuit |
| CN104571433A (en) * | 2013-10-21 | 2015-04-29 | 北京计算机技术及应用研究所 | Vehicular computer power supply and surge voltage suppression method thereof |
| CN106341038A (en) * | 2015-05-22 | 2017-01-18 | 无锡矽瑞微电子股份有限公司 | Constant voltage output switching power supply device with high power factor and control method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448886A (en) * | 2018-04-17 | 2018-08-24 | 华南理工大学 | A kind of Buck converters Bootstrapping drive circuit |
| CN108696126B (en) * | 2018-06-15 | 2024-02-09 | 黎明职业大学 | BUCK drive circuit |
| CN109067209A (en) * | 2018-09-30 | 2018-12-21 | 严添明 | A kind of high-power wide scope adjustable DC linear stabilized power supply |
| CN109510469A (en) * | 2019-01-15 | 2019-03-22 | 广东志成冠军集团有限公司 | A kind of the DC power supply self-start circuit and starting method of high voltage input and low-voltage output |
| CN109510469B (en) * | 2019-01-15 | 2023-10-03 | 广东志成冠军集团有限公司 | High-voltage input low-voltage output direct current power source starting circuit and starting method |
| CN109617429A (en) * | 2019-02-26 | 2019-04-12 | 晶艺半导体有限公司 | Voltage converter ic, high pressure BUCK converter and control method |
| CN110171018A (en) * | 2019-05-25 | 2019-08-27 | 塞伯睿机器人技术（长沙）有限公司 | Robot motor starts control device |
| CN112713770A (en) * | 2020-12-24 | 2021-04-27 | 潍柴动力股份有限公司 | BUCK converter |
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Application publication date: 20170915 |