CN106787638A - A kind of dynamic compensated line suitable for loop Current-type PWM Controller - Google Patents
A kind of dynamic compensated line suitable for loop Current-type PWM Controller Download PDFInfo
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- CN106787638A CN106787638A CN201710081603.2A CN201710081603A CN106787638A CN 106787638 A CN106787638 A CN 106787638A CN 201710081603 A CN201710081603 A CN 201710081603A CN 106787638 A CN106787638 A CN 106787638A
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- resistance
- diode
- current
- electric capacity
- pwm control
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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
- 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
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of dynamic compensated line suitable for loop Current-type PWM Controller, the driving pin of its pwm control circuit is connected with R1, R5 one end respectively, and grid of the R1 other ends respectively with R2 one end, switch transistor T 1 is connected, R2 other ends ground connection；The drain electrode of switch transistor T 1 is connected with one end of transformer BT1 armature windings, and the BT1 armature windings other end is connected with input+Vin；The source electrode of T1 is connected with resistance R4 one end, resistance R3 one end, diode D1 negative electrodes respectively；Diode D1 anodes are connected with the resistance R5 other ends, resistance R4 other ends ground connection；The current detecting end of pwm control circuit is connected with the anode of one end of resistance R3, diode D2, and the negative electrode of diode D2 is connected with resistance R6 one end, electric capacity C2 one end respectively, and resistance R6 and the electric capacity C2 other ends are grounded.The present invention effectively reduces the loss of compensation resistance, and the overcurrent protection function of power module is sensitiveer so that PWM current mode working methods are more suitable for high input voltage and high power D C/DC power modules.
Description
Technical field
The invention belongs to electronic circuit field, it is related to high input voltage DC/DC power supplys, and in particular to one kind is applied to current mode
The dynamic compensated line of PWM controller.
Background technology
PWM current-mode control modes being used current high input voltage DC/DC power supplys more.The advantage of current-mode control mode is：
Bandwidth is high, and transient state closed loop response is fast, also very fast to input voltage and the response of the transient changing of output loading.But a disadvantage is that electric current
Loop, when high powe design is applied to, because the compensation under underloading is not enough, can be caused generally using input positive feedback compensation
Loop work is unstable, causes output waveform to vibrate.Compensate network simultaneously has certain power consumption in itself, and can be with input voltage
Raise and increase.Also it is unfavorable for the application under high input voltage.At present, Switching Power Supply control mode has three kinds, i.e. pulse width
Modulation system (PWM), pulse frequency modulated mode (PFC) and compound modulation.Wherein PWM control modes are at present using most
Extensive control mode.PWM is divided into two kinds of voltage-type and current mode again.As shown in figure 1, using voltage type PWM control only one
Individual Voltage Feedback closed loop, the output voltage with power supply as feedback signal, with the deviation of set-point through comparator put by the feedback signal
Compare generation control pulse after big with sawtooth waveforms.The advantage of voltage type PWM controller is to use single feedback voltage closed loop design,
Debugging is easier, and has the disadvantage slow to the change dynamic response of input voltage.Current type PWM control principle is as shown in Fig. 2 electric current
Type PWM is double closed-loop control system, is to constitute current closed-loop by sampled feedback signal of switching tube source current, with Voltage Feedback
Signal constitutes outer voltage, and the output bias of outer voltage compare product with current feedback signal as the set-point of current inner loop
Raw control pulse.Current type PWM control advantage be：Bandwidth is high, and transient state closed loop response is fast, change and output to input voltage
The change transient response of load is also very fast.The mode of current-mode control ring sampling has two kinds, small-power as shown in figure 3, resistance takes
The circuit diagram of sample, it is high-power as shown in figure 4, using current transformer.Because many control loops of current-mode control, to ring
Road debugging brings certain difficulty.For reinforcing feedback stability, it will usually increase a feedforward compensation in current loop, such as
Shown in Fig. 5, R5 is connected to input in figure, for current detecting end provides an extra current compensation.It is existing as can be seen from above
Although compensation way circuit structure is simple, shortcoming it is also obvious that be exactly that the resistance can consume certain power, particularly in height
During input voltage, it is often necessary to multiple resistant series, while the feedback current of the resistance can change and change with input voltage,
Current compensation reduces under low input, is unfavorable for ensureing the stabilization of loop.
The content of the invention
The present invention is directed under high-power range of application, and current type PWM control circuit compensation mode is lost big asking
A kind of topic, it is proposed that dynamic compensated line suitable for loop Current-type PWM Controller.
The present invention is adopted the following technical scheme that：A kind of dynamic compensated line suitable for loop Current-type PWM Controller, including
The current detecting end for driving pin and pwm control circuit of pwm control circuit, the driving pin of pwm control circuit respectively with R1, R5
One end be connected, the other end of R1 one end respectively with R2, the grid of switch transistor T 1 are connected, and the other end of R2 is grounded；Switching tube
The drain electrode of T1 is connected with one end of the armature winding of transformer BT1, and the other end of BT1 armature windings is connected with input+Vin；
The source electrode of T1 one end respectively with resistance R4, one end of resistance R3, the negative electrode of diode D1 are connected；The anode of diode D1 and electricity
The other end for hindering R5 is connected, the other end ground connection of resistance R4；The current detecting end of pwm control circuit and one end, two of resistance R3
The anode of pole pipe D2 is connected, and the negative electrode of diode D2 one end respectively with resistance R6, one end of electric capacity C2 are connected, resistance R6 with
The other end ground connection of electric capacity C2.
A kind of dynamic compensation method for being applied to loop Current-type PWM Controller using above-mentioned compensated line, pwm control circuit
Drive end is set to the square-wave signal of frequency fixation, and the square-wave signal provides a dynamic compensation, diode D1 for current detecting end
Prevent from driving pin sourcing current to impact current detecting end；Electric capacity C2 and resistance R3 constitutes RC filtering, and diode D2 is used for
When drive end is low level, prevents C2 electric capacity from passing through resistance R3 and discharged to resistance R4；R6 is the discharge resistance of electric capacity C2；R5 resistance
Circuit drives end is connected on, the frequency and amplitude for driving square wave are fixed value, it is steady by obtaining one after several cycles on C2
Fixed voltage magnitude, for current loop provides compensation.
The beneficial effects of the invention are as follows：The present invention is big for original compensation network power consumption, is unfavorable for high-power power supply
Shortcoming, it is proposed that a kind of dynamic compensated line, be lost it is very small.Network, the excessively stream of power module are compensated using this kind simultaneously
Defencive function can be sensitiveer so that PWM current mode working methods are more suitable for high input voltage and high power D C/DC power supply moulds
Block.The present invention provides dynamic current compensation using drive end to the compensation resistance between current detecting end；Using on decoupling capacitor
Series diode prevent from electric current backflow on electric capacity from triggering protecting by mistake.The present invention merely add a small amount of component, just obtain
Lossless current compensation, while the compensation electric current will not change with input voltage so that loop is more stablized；Effectively drop of the invention
The loss of low compensation resistance, while when excessively stream, input over-current signal is superimposed with thermal compensation signal so that overcurrent protection response
Faster.The circuit is highly suitable for the application scenario of high-power.
Brief description of the drawings
Fig. 1 voltage type PWM control principle drawings of the prior art；
Fig. 2 current type PWM control principle drawings of the prior art；
The circuit diagram of Fig. 3 resistance samplings of the prior art；
Fig. 4 current transformer sample circuit figures of the prior art；
Fig. 5 current sampling circuit figures with feedforward compensation of the prior art；
The dynamic compensated line of Fig. 6 loop Current-type PWM Controllers of the invention.
Specific embodiment
As shown in fig. 6, according to the circuit diagram gone out given in Fig. 6, the circuit connection described between following each component is closed
System, including pwm control circuit the current detecting end for driving pin and pwm control circuit, the driving pin difference of pwm control circuit
It is connected with one end of R1, R5, the other end of R1 one end respectively with R2, the grid of switch transistor T 1 are connected, the other end ground connection of R2；
The drain electrode of switch transistor T 1 is connected with one end of the armature winding of transformer BT1, the other end and the input+Vin of BT1 armature windings
It is connected；The source electrode of T1 one end respectively with resistance R4, one end of resistance R3, the negative electrode of diode D1 are connected；The sun of diode D1
Pole is connected with the other end of resistance R5, the other end ground connection of resistance R4；The current detecting end of pwm control circuit and the one of resistance R3
End, the anode of diode D2 are connected, and the negative electrode of diode D2 one end respectively with resistance R6, one end of electric capacity C2 are connected, resistance
The other end ground connection of R6 and electric capacity C2.
As seen from Figure 6, resistance R5 and diode D1 series connection is connected to the drive end of pwm control circuit, pwm control circuit
Drive end be a square-wave signal that frequency is fixed, the square-wave signal is that current detecting end provides one and dynamically compensates, diode
D1 prevents from driving pin sourcing current to impact current detecting end；Electric capacity C2 and resistance R3 constitutes RC filtering, and diode D2 is used for
When drive end is low level, prevents C2 electric capacity from passing through resistance R3 and discharged to resistance R4, so as to avoid the occurrence of protection by mistake.R6 is electricity
Hold the discharge resistance of C2.Circuit R5 resistance is connected on circuit drives end, and the frequency and amplitude for driving square wave are all fixed values, are passed through
A voltage magnitude for stabilization can be obtained after several cycles on C2, for current loop provides compensation.Simultaneously because the electricity
It is square-wave signal to press, therefore loss will not be produced on R5 resistance.When there is excessively stream, the voltage on detection resistance R4 can mended
Superposition on the basis of voltage is repaid, so that overcurrent protection is sensitiveer, response is faster.
Claims (2)
1. driving pin and the PWM control of a kind of dynamic compensated line suitable for loop Current-type PWM Controller, including pwm control circuit
The current detecting end of circuit processed, it is characterised in that：The driving pin of pwm control circuit is connected with one end of R1, R5 respectively, and R1's is another
One end one end respectively with R2, the grid of switch transistor T 1 are connected, the other end ground connection of R2；The drain electrode of switch transistor T 1 and transformer
One end of the armature winding of BT1 is connected, and the other end of BT1 armature windings is connected with input+Vin；The source electrode of T1 respectively with electricity
One end of resistance R4, one end of resistance R3, the negative electrode of diode D1 are connected；The other end phase of the anode of diode D1 and resistance R5
Even, the other end ground connection of resistance R4；The current detecting end of pwm control circuit and one end of resistance R3, the anode phase of diode D2
Even, the negative electrode of diode D2 one end respectively with resistance R6, one end of electric capacity C2 are connected, the other end of resistance R6 and electric capacity C2
Ground connection.
2. the dynamic compensation method of loop Current-type PWM Controller, its feature are applied to using compensated line as claimed in claim 1
It is：Specifically include following steps：The drive end of pwm control circuit is set to the square-wave signal of frequency fixation, and the square-wave signal is
Current detecting end provides a dynamic compensation, and diode D1 prevents from driving pin sourcing current to impact current detecting end；Electric capacity
C2 and resistance R3 constitutes RC filtering, and diode D2 is used to, when drive end is low level, prevent C2 electric capacity from passing through resistance R3 to electricity
Resistance R4 electric discharges；R6 is the discharge resistance of electric capacity C2；R5 resistance is connected on circuit drives end, drives the frequency and amplitude of square wave to fix
Value, by obtaining a voltage magnitude for stabilization after several cycles on C2, for current loop provides compensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710081603.2A CN106787638B (en) | 2017-02-15 | 2017-02-15 | A kind of dynamic compensated line suitable for loop Current-type PWM Controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710081603.2A CN106787638B (en) | 2017-02-15 | 2017-02-15 | A kind of dynamic compensated line suitable for loop Current-type PWM Controller |
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| Publication Number | Publication Date |
|---|---|
| CN106787638A true CN106787638A (en) | 2017-05-31 |
| CN106787638B CN106787638B (en) | 2019-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710081603.2A Active CN106787638B (en) | 2017-02-15 | 2017-02-15 | A kind of dynamic compensated line suitable for loop Current-type PWM Controller |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202587486U (en) * | 2012-03-19 | 2012-12-05 | 叶军 | LED drive chip and circuit with power compensation |
| JP2013004959A (en) * | 2011-06-16 | 2013-01-07 | Samsung Electro-Mechanics Co Ltd | Light emitting diode driver having offset voltage compensating function |
| CN203562941U (en) * | 2013-07-16 | 2014-04-23 | 西子电梯集团有限公司 | A switching power supply circuit with a driving chip power overvoltage protection function |
-
2017
- 2017-02-15 CN CN201710081603.2A patent/CN106787638B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013004959A (en) * | 2011-06-16 | 2013-01-07 | Samsung Electro-Mechanics Co Ltd | Light emitting diode driver having offset voltage compensating function |
| CN202587486U (en) * | 2012-03-19 | 2012-12-05 | 叶军 | LED drive chip and circuit with power compensation |
| CN203562941U (en) * | 2013-07-16 | 2014-04-23 | 西子电梯集团有限公司 | A switching power supply circuit with a driving chip power overvoltage protection function |
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| Publication number | Publication date |
|---|---|
| CN106787638B (en) | 2019-05-10 |
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