CN107453738A - A kind of feedback signal slope compensation circuit based on digital current type PWM - Google Patents
A kind of feedback signal slope compensation circuit based on digital current type PWM Download PDFInfo
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- CN107453738A CN107453738A CN201710836687.6A CN201710836687A CN107453738A CN 107453738 A CN107453738 A CN 107453738A CN 201710836687 A CN201710836687 A CN 201710836687A CN 107453738 A CN107453738 A CN 107453738A
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- 238000010277 constant-current charging Methods 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 230000013011 mating Effects 0.000 claims description 2
- 230000011664 signaling Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 18
- 238000002407 reforming Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000007600 charging Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 108010076504 Protein Sorting Signals Proteins 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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- 230000035772 mutation Effects 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
-
- 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
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- Engineering & Computer Science (AREA)
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- Dc-Dc Converters (AREA)
Abstract
A kind of feedback signal slope compensation circuit based on digital current type PWM can provide a reliable and stable oblique wave compensation superposed signal.The output control signal consistent with peak value type PWM master signal cycles, duty cycle signals can be produced by chip to obtain a ramp signal, this ramp signal is added on primary side feedback signal to solve in peak current mode PWM control methods, when dutycycle is more than 50%, open-loop unstable, the reforming phenomena that system occurs.Ramp signal can be completely loaded into primary side feedback signal by the present invention, and be followed completely with the cycle of primary side feedback signal and dutycycle, being consistent property.
Description
Technical field
The invention belongs to a kind of power-supply device that can apply to numeral welding, it is related to power electronic devices and switch
The application of power supply and the source of welding current.
Background technology
The dynamic response of the source of welding current refers to the power-supply system when transition occurs for load, and system output quantity is from original state
The process of stable state is reached, the dynamic response of power supply reflects adaptability to changes when power supply is undergone mutation to load, is to assess
One of most important means of power supply loop stability.With greatly developing for digital welding power source, the controlling party of Switching Power Supply
Method has also obtained quite being widely applied in digital inverter type welder.Corresponding Switching Power Supply control method includes pulse frequency tune
Make (PFM) and pulse width modulation (PWM) and mixing three kinds of modes of debugging, wherein PWM debud modes have that the linearity is good, loads
The features such as regulation height and good heat endurance, it is set to be widely applied in power control system.In PWM debud modes
It is most commonly seen with voltage type PWM control and current type PWM control.And relative to voltage type PWM control program, current type PWM control
Scheme processed has advantages below：Due to the electric current in inductance with input voltage subtract output voltage slope rise, to input electricity
The change of the pressure waveform can respond immediately, so as to eliminate delay response；Because error amplifier is used to control output electricity
Stream rather than voltage, the influence of output inductor are reduced to minimum, and wave filter provides single limit to feedback control loop；Using electricity
Flow pattern PWM control method, pulse current limitation, has good dynamic property one by one.Current type PWM control method can be divided into
Two kinds of control methods of peak current mode and average value current mode.Application at present relatively it is wide it is most commonly seen be peak current mode controlling party
Method, its operation principle are feedback voltage and reference voltage to be input into error amplifier, then output error signal, the error
Signal and the current sampling signal of primary side are input to comparator, and control is controlled by the duty cycle signals of output after being compared
The turn-on and turn-off of switching tube processed.This method is the control method of a kind of voltage, current double closed-loop.But peak current mode PWM
In control method, when dutycycle is more than 50%, concussion will occurs in open-loop unstable, system.For this, the present invention devises one
Feedback signal slope compensation circuit of the kind based on current type PWM, to cause in the case of dutycycle is more than 50%, feedback current
The thermal compensation signal of the consistent positive slope of a cycle, dutycycle is superimposed in signal waveform, can be gradually reduced what disturbing signal was brought
Vibration, final system tend towards stability.
The content of the invention
It is an object of the present invention to by design a kind of special slope compensation circuit provide one it is reliable and stable just
Slope-compensation superposed signal, to solve in peak current mode PWM control methods, when dutycycle be more than 50% when open-loop unstable and
System shakes problem.Specific implementation is as follows：
It is of the invention mainly to provide energy to electric capacity using integrated chip to provide stable constant-current source, then utilize PWM-
Pwm control signal caused by CHIP chips to carry out discharge and recharge to electric capacity, consistent with PWM cycle with dutycycle so as to produce
Oblique wave, hereafter ramp signal by after operational amplifier formed a stable ramp voltage signal, then with primary current feed back
Circuit carries out partial pressure superposition, it is obtained a reliable and stable slope-compensation superposed signal, finally realizes peak current mode PWM
Control method.
VCC is power supply, and controllable accurate source of stable pressure Z1, triode Q1 and resistance R1, R2 form a simple constant current
Source circuit forms stable constant-current charging circuit and provides energy for electric capacity C1.Pwm control signal is direct caused by pwm chip
For controlling switch pipe Q3；Switching tube Q3 and resistance R3 mating connections VCC is used, and causes switching tube Q2 according to current type PWM week
Phase, dutycycle consistent signal synchronizes electric discharge to electric capacity C1.I.e. when switching tube Q3 is turned on, switching tube Q2 shut-offs,
Constant-current charging circuit charges to electric capacity C1, and charging voltage rises in accordance with U=It/c rules；When switching tube Q3 is turned off, switch
Pipe Q2 is turned on, and electric capacity C1 is directly grounded by switching tube Q2, and discharge current is more than constant-current charge electric current, electric capacity C1 electric discharges, voltage
It is rapidly decreased to low level.Ramp voltage signal caused by electric capacity C1 discharge and recharge exports stable voltage by operational amplifier U1
Signal, i.e. oblique wave compensation signal Vc.Oblique wave compensation signal Vc passes through the primary current feedback signal Vs that is gathered with sensor, ground connection
Signal carries out partial pressure superposition by resistance, finally gives reliable and stable oblique wave compensation superposed signal Vs+c and enters control chip,
Complete the control program of digital peak current type PWM.
Brief description of the drawings
Fig. 1 is digital peak current type PWM control circuit schematic diagram
Fig. 2 is slope compensation circuit schematic diagram
Fig. 3 is key node signal sequence schematic diagram
Embodiment
The embodiment of this circuit is as follows：
This circuit solves duty in digital peak current type PWM control method by producing and being superimposed oblique wave compensation signal
Than system oscillation problem in the case of more than 50%.Be superimposed in the signal waveform of feedback current caused by this circuit with its cycle, account for
The empty thermal compensation signal than consistent positive slope, the vibration that disturbing signal is brought can be gradually reduced, final system tends towards stability.
Shown in reference picture 1, in real work, pwm chip output pwm signal is respectively applied to main circuit and oblique wave
Compensation circuit.The areas of Tu Zhong 1 are slope compensation circuit (being the emphasis circuit of the present invention), and 2nd area are digital peak current type PWM control
Main circuit schematic diagram under method processed.Pwm chip mainly provides pwm signal, wherein a-road-through overdrive circuit (in figure
Omit) main circuit is acted on, the drive signal as main circuit switch pipe.Another way then directly applies to slope compensation circuit,
Drive signal as switching tube Q3.Adopted by caused thermal compensation signal Vc proportionings superposition sensor in 1 area's slope compensation circuit
The main circuit primary side feedback signal Vs of collection ultimately forms superposed signal Vs+c and enters pwm chip, by pwm chip
Portion's digital comparator, with the main circuit secondary side feedback voltage signal V by being gathered by sensorfbAnd default value
The more caused error amount Ve of REFERENCE are compared, then through PWM signal generator inside pwm chip, determine dutycycle
Size, so as to export regulation after pwm signal, ultimately form control loop.
Fig. 2 is slope compensation circuit schematic diagram, is the main part of the present invention.Pwm chip produces PWM output signal
It is therein to be directly connected all the way with the grid G of Q3 switching tubes to control the on, off of Q3 switching tubes.Switching tube Q3 source S
Ground connection is connected with GND, and drain D and resistance R3 and switching tube Q2 grid G are connected to form node a.Resistance R3 opposite sides and power supply
VCC is connected, and energy is provided for driving switch pipe Q2, i.e. when switching tube Q3 is turned on, switching tube Q2 grid G voltage is low-voltage,
Switching tube Q2 is off state, otherwise switching tube Q2 is in the conduction state.Switching tube Q2, switching tube Q3, resistance R3 compositions are originally
Synchronous discharge circuit (2) in slope compensation circuit.Illustrate herein, such as reach synchronous discharge effect using other discharge circuits
Within the protection domain of this patent.
Switching tube Q2 source S ground connection is connected with GND, its drain D and electric capacity C1, resistance R2, controllable accurate source of stable pressure Z1
Node b is connected to form with reference to pole R and operational amplifier U1 pin 3.It is resistance R2 opposite sides and triode Q1 emitter Es, controllable
Precision voltage regulator Z1 negative electrodes K is connected to form node c, controllable accurate source of stable pressure Z1 anode As and triode Q1 base stages B, resistance R1 phases
Company forms node d, and resistance R1 opposite sides are connected to form node e with triode Q1 colelctor electrodes C, power supply VCC.That is power supply VCC, resistance
R1, controllable accurate source of stable pressure Z1, triode Q1 and resistance R2 form the constant-current charging circuit (1) in this slope compensation circuit, are
Electric capacity C1 provides energy.Illustrate herein, such as reach its charging effect also in the protection domain of this patent using other constant-current circuits
Within.
Electric capacity C1 opposite sides ground connection is connected with GND, i.e., when the shut-off of Q2 switching tubes, constant-current charging circuit fills to electric capacity C1
Electricity, and charging voltage rises in accordance with U=It/c rules；When switching tube Q2 is turned on, electric capacity C1 is directly grounded by switching tube Q2,
Discharge current is more than constant-current charge electric current, electric capacity C1 electric discharges, and voltage is rapidly decreased to low level, is formed at node b corresponding oblique
Wave voltage signal.Operational amplifier U1 pin 5 is connected with power supply VCC, and pin 2 is grounded, and pin 4 is connected with pin 1, pin 1
For operational amplifier U1 output.Operational amplifier U1 pin 1 and pin 4 is connected to form at node f, f node with resistance R4
The voltage signal of formation is stable ramp signal Vc.Resistance R4 opposite sides are connected to form node g with resistance R6, resistance R5.This
Outside, resistance R5 opposite sides ground connection is connected with GND, and resistance R6 opposite sides are the main circuit primary side feedback voltage signal of sensor collection
Vs is connected.Operational amplifier U1, resistance R4, resistance R5, resistance R6, electric capacity C1 form the synchronizing signal in this slope compensation circuit
Supercircuit (3).Matched by synchronizing signal supercircuit resistance R4, R5, R6 relevant voltage signal, the shape at node g
Into final superposed signal Vs+c.
Fig. 3 is signal sequence schematic diagram, and each clock signal in pwm chip inside triggers a corresponding cycle, Ve
For by main circuit secondary side feedback voltage signal VfbWith the more caused error amounts of default value REFERENCE, Vc is put for computing
The ramp signal of the big output of device U1 pins 1, Vs is the main circuit primary side feedback signal of sensor collection, after being superimposed oblique wave compensation
Signal Vs+c, signal Vs+c and Ve are compared inside pwm chip, so as to obtain its corresponding dutycycle pwm signal
LATCH。
In summary, can be produced by pwm chip and the main circuit drive signal under peak value type PWM control methods
The consistent output control signal of cycle, duty cycle signals obtains an oblique wave feedback signal, and this ramp signal is added to
Solved on primary side feedback signal in peak current mode PWM control methods, when dutycycle is more than 50%, open-loop unstable, be
The reforming phenomena that system occurs.
Fig. 1 is the general illustration of the digital peak current type PWM control circuit principle of the present invention.Including
Control-Chip represents pwm chip, Drive-Circuit represents the drive circuit of main circuit, Voltage-Sensor
Represent the main circuit (2) and slope compensation circuit (1) under voltage sensor, digital peak current type PWM control method；From sensing
The main circuit primary current feedback signal Vs and oblique wave compensation signal Vc of device collection is by superposition, and most signal Vs+c is transferred at last
Main control chip completes control loop.
Fig. 2 be the present invention emphasis main part, slope compensation circuit schematic diagram, including constant-current charging circuit (1),
Synchronous discharge circuit (2), synchronizing signal supercircuit (3).
Fig. 3 is in the present invention, is the time diagram of voltage waveform for Fig. 1, Fig. 2 key node etc..
Claims (3)
- A kind of 1. feedback signal slope compensation circuit based on digital current type PWM, it is characterised in that：The circuit includes a perseverance Current charge circuit (1), synchronous discharge circuit (2) and synchronizing signal supercircuit (3)；The constant-current charging circuit includes：Controllable accurate source of stable pressure Z1, triode Q1, resistance R1, resistance R2；Controllable accurate source of stable pressure Z1 and triode Q1 and resistance R1, R2 form a constant-current source circuit, and side is connected with constant pressure source VCC, and opposite side is that electric capacity C1 is carried Energy supply amount.
- 2. a kind of feedback signal slope compensation circuit based on digital current type PWM according to claim 1, its feature exist In：The synchronous discharge circuit includes：Switching tube Q2, switching tube Q3, resistance R3；Switching tube Q3 is directly controlled by pwm chip System, cause the electric discharge of C1 electric capacity with controlling switch Q2 conducting shut-off with resistance R3 mating connections VCC.
- 3. a kind of feedback signal slope compensation circuit based on digital current type PWM according to claim 1, its feature exist In：The synchronizing signal supercircuit includes：Operational amplifier U1, resistance R4, resistance R5, resistance R6, electric capacity C1；C1 electric capacity fills Electric discharge forms ramp waveform and passes through operational amplifier U1, obtains stable ramp signal Vc.Primary current feedback signal Vs, oblique wave Thermal compensation signal Vc and ground signalling carry out partial pressure proportioning by resistance R6, resistance R4, resistance R5 and finally give oblique wave compensation superposition Signal Vs+c.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710836687.6A CN107453738A (en) | 2017-09-17 | 2017-09-17 | A kind of feedback signal slope compensation circuit based on digital current type PWM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710836687.6A CN107453738A (en) | 2017-09-17 | 2017-09-17 | A kind of feedback signal slope compensation circuit based on digital current type PWM |
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| CN107453738A true CN107453738A (en) | 2017-12-08 |
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| CN201710836687.6A Pending CN107453738A (en) | 2017-09-17 | 2017-09-17 | A kind of feedback signal slope compensation circuit based on digital current type PWM |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187227A (en) * | 2019-07-02 | 2021-01-05 | 德尔福技术知识产权有限公司 | Compensator circuit and method for oxygen sensor |
| CN112366955A (en) * | 2020-10-30 | 2021-02-12 | 上海空间电源研究所 | Constant current control circuit and method based on push-pull circuit |
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|---|---|---|---|---|
| CN101964587A (en) * | 2009-04-06 | 2011-02-02 | 成都芯源系统有限公司 | Direct current converter and control circuit and method for direct current converter |
| US20140159686A1 (en) * | 2012-12-11 | 2014-06-12 | Samsung Electronics Co., Ltd. | Current mode pwm boost converter |
| CN104539157A (en) * | 2014-12-12 | 2015-04-22 | 杭州凯尔达电焊机有限公司 | Slope compensation control method and circuit for inverted welding power source with peak current control mode |
| CN105553264A (en) * | 2015-12-30 | 2016-05-04 | 山东大学 | Single chip machine controlled peak current mode switching power supply |
| CN107104592A (en) * | 2017-04-27 | 2017-08-29 | 电子科技大学 | A kind of slope compensation circuit |
-
2017
- 2017-09-17 CN CN201710836687.6A patent/CN107453738A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964587A (en) * | 2009-04-06 | 2011-02-02 | 成都芯源系统有限公司 | Direct current converter and control circuit and method for direct current converter |
| US20140159686A1 (en) * | 2012-12-11 | 2014-06-12 | Samsung Electronics Co., Ltd. | Current mode pwm boost converter |
| CN104539157A (en) * | 2014-12-12 | 2015-04-22 | 杭州凯尔达电焊机有限公司 | Slope compensation control method and circuit for inverted welding power source with peak current control mode |
| CN105553264A (en) * | 2015-12-30 | 2016-05-04 | 山东大学 | Single chip machine controlled peak current mode switching power supply |
| CN107104592A (en) * | 2017-04-27 | 2017-08-29 | 电子科技大学 | A kind of slope compensation circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187227A (en) * | 2019-07-02 | 2021-01-05 | 德尔福技术知识产权有限公司 | Compensator circuit and method for oxygen sensor |
| CN112366955A (en) * | 2020-10-30 | 2021-02-12 | 上海空间电源研究所 | Constant current control circuit and method based on push-pull circuit |
| CN112366955B (en) * | 2020-10-30 | 2022-04-08 | 上海空间电源研究所 | Constant current control circuit and method based on push-pull circuit |
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Application publication date: 20171208 |