CN104836420B - Voltage conversion circuit, voltage conversion controller and parameter setting method thereof - Google Patents
Voltage conversion circuit, voltage conversion controller and parameter setting method thereof Download PDFInfo
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Abstract
The invention relates to a voltage conversion circuit, comprising: the power switch is used for generating a pulse width modulation signal to drive a current load, and the pulse width modulation signal is switched between a first potential and a second potential; a sensing pin, receiving the first sensing signal when the pulse width modulation signal is at a first potential, and receiving the second sensing signal when the pulse width modulation signal is at a second potential; the parameter sampling setting unit is provided with an input end coupled to the sensing pin, generates preset current or preset voltage on the sensing pin when the pulse width modulation signal is at the second potential, samples the second sensing signal to generate a sampling signal, and keeps the sampling signal when the pulse width modulation signal is at the first potential so as to set the parameter of the voltage conversion circuit.
Description
Technical field
The present invention relates to a kind of voltage conversion circuit and voltage conversion controller, particularly one kind to be not required to additionally increase
On the premise of stitch, the voltage conversion circuit and voltage that can be set with the hardware resource of saving to the parameter of integrated circuit
Switching controller.
Background technology
It refer to U.S. Patent number US7,315,190.Its voltage conversion controller 200 is real in a manner of integrated circuit
It is existing, to reduce the actual size of voltage conversion circuit, it can also reduce cost.In order to set in voltage conversion controller 200
Portion's circuit parameter, this prior art are connected to the output stitch P4 of power component driving stage using the resistive element Roc of outside, and
Starting at the beginning before being introduced into normal operating state in voltage conversion controller 200, utilizing voltage conversion controller 200
Internal predetermined current source, in forming a voltage on resistive element Roc, then sample and keep the voltage and turn to set voltage
The internal circuit parameter of changer controller 200.Such voltage conversion controller 200 does not need extra stitch to carry out internal circuit
The setting of parameter, furthermore the i.e. adjustable corresponding internal circuit parameter of resistance value for changing resistive element Roc.
The startup stage that above-mentioned prior art can not yet enter before normal operating in circuit carries out internal circuit parameter setting,
But internal circuit parameter setting can not be carried out under normal operating condition.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art and defect, proposes a kind of voltage conversion circuit and voltage
Switching controller, can be on the premise of being not required to additionally increase stitch, can be with the hardware resource of saving to voltage conversion controller
Parameter is set.The present invention can carry out internal circuit parameter setting in startup stage, can also enter under normal operating condition
Row internal circuit parameter setting, alternatively or it can have concurrently.
For the above-mentioned purpose, the present invention proposes a kind of voltage conversion controller, applied to voltage conversion circuit.Voltage conversion
Circuit produces pulse width modulation signal to operate a power switch therein, is loaded to driving current.Pulse width modulation signal is in
One current potential toggles with the second current potential, and voltage conversion circuit includes first resistor and second resistance, voltage conversion controller
Including sensing pin and parameter sampling setup unit.
When pulse width modulation signal is the first current potential, sensing pin receives the first sensing signal, and works as pulse width modulation signal
For the second current potential when, sensing pin receive second sensing signal.Parameter sampling setup unit there is input to be coupled to sensing connect
Pin, and when pulse width modulation signal is the second current potential, parameter sampling setup unit produces predetermined current or predeterminated voltage in sensing
Pin samples the second sensing signal to produce sample signal to produce the second sensing signal, and when pulse width modulation signal is the
During one current potential, parameter sampling setup unit keeps sample signal, to set the parameter of voltage conversion controller.
For the above-mentioned purpose, the present invention proposes a kind of voltage conversion circuit, including power switch, first resistor, second again
Resistance, sensing pin and parameter sampling setup unit.Power switch is controlled by a pulse width modulation signal and born with driving current
Carry, pulse width modulation signal toggles in the first current potential and the second current potential.It is the first current potential that pin, which is sensed, in pulse width modulation signal
When, the first sensing signal is received, and when pulse width modulation signal is the second current potential, receive the second sensing signal.Parameter sampling is set
There is order member input to be coupled to sensing pin, when pulse width modulation signal is the second current potential, parameter sampling setup unit production
Raw predetermined current or predeterminated voltage, to produce the second sensing signal, and sample the second sensing signal to produce sampling in sensing pin
Signal, and when pulse width modulation signal is the first current potential, parameter sampling setup unit keeps sample signal, turns to set voltage
Change the parameter of circuit.
For the above-mentioned purpose, the present invention proposes a kind of parameter setting method of voltage conversion circuit, voltage conversion electricity again
Road has a voltage conversion controller, and it produces a pulse width modulation signal to operate a power switch to carry out voltage conversion, should
Voltage conversion controller includes a sensing pin to detect a sensing electric current, and the voltage conversion controller receives a power supply, should
Parameter setting method includes：In the circuit start stage, when the power supply rises above a preset reference level, the voltage conversion control
Device processed sends out an electric current through the sensing pin to outside；And the voltage according to the sensing pin, set voltage conversion control
The parameter of device.
The effect of of the invention, is, in the startup stage of voltage conversion circuit work or each cycle of normal operating
In, when the sensing pin on voltage conversion controller and when being not used for feedback control, electricity is coordinated with predetermined current or predeterminated voltage
Resistance element produces a signal on sensing pin, and carries out receiving the signal on sensing pin with parameter sampling setup unit,
To set the parameter of voltage conversion controller.So not only it is not required to additionally increase stitch, moreover it is possible to the hardware resource pair of saving
The parameter of voltage conversion controller is set.
Feature, implementation and effect for the present invention, accompanying drawing is now coordinated to make most preferred embodiment detailed description as follows.
Brief description of the drawings
Fig. 1 is the schematic diagram of the voltage conversion circuit of first embodiment disclosed in this invention；
Fig. 2 is the schematic diagram of the voltage conversion circuit of second embodiment disclosed in this invention；
Fig. 3 is the schematic diagram of the voltage conversion circuit of 3rd embodiment disclosed in this invention；
Fig. 4 is the schematic diagram for the embodiment that parameter disclosed in this invention samples setup unit；
Fig. 5 is the schematic diagram for another embodiment that parameter disclosed in this invention samples setup unit；
Fig. 6 is the schematic diagram of the embodiment of current sampling holding circuit disclosed in this invention.；
Fig. 7 is that parameter samples the reality that setup unit is applied to the switch controller of power supply of a flyback switch power converter
Illustration is applied to be intended to；
For Fig. 8 by taking Fig. 1 embodiment as an example, display carries out the waveform diagram of parameter setting under normal operating condition；
Fig. 9 is shown in the waveform diagram of startup stage progress parameter setting by taking Fig. 1 embodiment as an example.
Symbol description in figure
100th, 200,300 voltage conversion circuit
110th, 210,310,710 power switch control unit
120th, 220,320,325,720 power switch driver element
130th, 230,330,400,500 parameters sampling setup unit
140th, 240,340,740 first resistor
150th, 250,350,750 second resistance
160 conversion transformers
170th, 270 output diode
180th, 280,360,380,780 power switch
190th, 290,390 sensing pin
195th, 295,395,795 voltage conversion controller
260th, 370 conversion inductance
400 parameters sample setup unit
410 setting electric current sources
420 configuration switch
430 input buffer stages
440 voltage sampling holding circuits
441st, 541 input
442nd, 542 output end
443rd, 543 control terminal
445 the first output ends of parameter
450 output buffer stages
460 Voltage-current conversion circuits
470 parameter setting voltage signals
480th, 560 control terminal
485 parameter setting current signals
490th, 590 parameter input end
510 setting reference voltages
520 voltage circuit amplifiers
521 Enable Pins
530 voltage circuit transistors
540 current sampling holding circuits
550 parameter outputs
551 output current signals
591 second sensing signals
610 current input transistors
620 electric current output transistors
630 current samplings switch
640 current sampling electric capacity
650 supply-voltage sources
660 input currents
670 output currents
700 flyback switch power converters
730 output driving setting electric currents
731st, 761 switchings are closed
760 output driving predetermined currents
Embodiment
In specification and claims, " coupling " one word includes any direct and is indirectly electrically connected hand herein
Section.Therefore, if the first device of described in the text one is coupled to a second device, can be directly electrically connected in by representing first device
Two devices, or be electrically connected indirectly to second device by other devices or connection means.In addition, the word of transistor unit one,
Refer to a kind of solid semiconductor element, at least with three end points, a passage, the 3rd end points are formed between two of which end points
For control terminal, the conducting as control passage is used with the degree ended；Transistor can be used for amplification signal, switch, voltage stabilizing, news
Number modulation and the work of other analog signals and digital signal processing, its purposes can obtain easily for those skilled in the art
Know.
Fig. 1 is the schematic diagram of the voltage conversion circuit 100 of first embodiment disclosed in this invention.Do not included in Fig. 1
Complete voltage conversion circuit, only illustrate so that the main element of the spirit of present invention part can be described in detail and illustrate it.Electricity
Voltage conversion circuit 100 is the sample of a flyback switch power converter (flyback switching power converter)
State, the operation that an input voltage source is boosted or is depressured is produced into a VD, and promoted in output end
Current loading.Voltage conversion circuit 100 includes power switch control unit 110, power switch driver element 120, parameter
Sample setup unit 130, first resistor 140, second resistance 150, conversion transformer 160, output diode 170, power switch
180 and sensing pin 190.Voltage conversion circuit 100 utilizes a feedback circuit (not shown), determines power switch component
The ON operation cycle (duty cycle) of 180 passage.Power switch control unit 110 produces control signal and gives power switch
Driver element 120, driving voltage or driving current signal needed for driving power switch 180 are produced, to control power switch
The on or off of 180 passage, and in the secondary side of conversion transformer 160, that is, it is coupled to the one of output diode 170
Side, a pulse wave width modulation signal is produced, and exported via output diode 170 to drive a current loading (not shown).
Further illustrate, when the passage of power switch 180 is turns on, the secondary side of conversion transformer 160 does not produce electricity
Stream, and the pulse width modulation signal of described secondary side is now the first current potential, it is related to the magnitude of voltage of input voltage source.And work as work(
When the passage of rate switch 180 is ends, the secondary side of conversion transformer 160 produces electric current, and the pulsewidth of described secondary side is adjusted
Become signal now into the second current potential, it is related to the magnitude of voltage of VD.Because the passage of power switch 180 carries out the cycle
Turn on and end to property, therefore described pulse width modulation signal switches to and fro in the first current potential and the second current potential.
As shown in figure 1, wherein power switch control unit 110, power switch driver element 120 and parameter sampling are set
Order member 130 can be the component units of voltage conversion controller 195, and voltage conversion controller 195 can utilize semiconductor
The integrated circuit that processing procedure is produced, to reduce the actual size of voltage conversion circuit 100, it can also reduce cost.Voltage conversion control
Device 195 processed also comprising sensing pin 190, is coupled to second resistance 150 and parameter samples the input of setup unit 130.
In the prior art, pin 190 is sensed to detect the first sensing signal related to feedback control, such as when power switch 180
Passage for conducting when, flow through the sensing electric current of power switch 180 as sensing and be used, and sense electric current and the current loading
Size is related；But when the passage of power switch 180 is ends, sense and do not produced on pin 190 or to detect intentionally
The signal of justice.The spirit of the present invention, it is in each cycle of pulse width modulation signal, when the passage of power switch 180 is cut-off
When, coordinate resistive element to produce a signal on sensing pin 190 with a predetermined current or predeterminated voltage, and sampled with parameter
Setup unit 130 carries out receiving the signal on sensing pin 190, to set the parameter of the voltage conversion controller 195.
As shown in figure 1, when the passage of power switch 180 is cut-off, that is, described pulse width modulation signal is the second current potential
When, parameter sampling setup unit 130 produces a predetermined current or a predeterminated voltage in sensing pin 190, and combines first resistor
140 and the series circuit of second resistance 150 form one second sensing signal in sensing pin 190, such as predetermined current flows through
The series circuit of first resistor 140 and second resistance 150 and the second sensing signal for forming a voltage pattern, or default electricity
Pressure is biased in the series circuit of first resistor 140 and second resistance 150 and forms the second sensing signal of an electric current pattern.This
When parameter sampling setup unit 130 received by sensing pin 190 and sample the second sensing signal to produce a sample signal.And
When the passage of power switch 180 is conducting, that is, when pulse width modulation signal be the first current potential, foregoing predetermined current or preset
Voltage is closed, while parameter sampling setup unit 130 keeps foregoing sample signal, and to set voltage conversion controller
195 parameter, and the sensing electric current on the passage of power switch 180 flows through first resistor 140, and in the upper of first resistor 140
The voltage of the first sensing signal is formed, sensing pin 190 coupled to the first sensing signal and is connect by second resistance 150
Receive, to be used as feedback control.
Fig. 2 is the schematic diagram of the voltage conversion circuit 200 of second embodiment disclosed in this invention.Voltage conversion circuit
200 be the pattern of a booster switcher power supply changeover device (boost switching power converter), by an input electricity
Operation that potential source is boosted and produce a VD, and promote the current loading in output end.Voltage conversion
Circuit 200 includes power switch control unit 210, power switch driver element 220, parameter sampling setup unit 230, first
Resistance 240, second resistance 250, conversion inductance 260, output diode 270, power switch 280 and sensing pin 290.Its
Middle power switch control unit 210, power switch driver element 220 and parameter sampling setup unit 230 can be that voltage turns
The component units of changer controller 295, and its function refers to unit corresponding in voltage conversion controller 195.Voltage conversion
The one feedback circuit (not shown) of utilization of circuit 200, the ON operation cycle of the passage of decision power switch component 280, and in
The tie point for changing inductance 260 and output diode 270 forms a pulse wave width modulation signal, defeated via output diode 170
Go out to drive a current loading (not shown).
In the prior art, when power switch 280 passage for cut-off when, sense pin 290 on not produce or to
Detect significant signal.Second embodiment disclosed in this invention, it is in each cycle of pulse width modulation signal, works as power
When the passage of switch 280 is ends, resistive element is coordinated to be produced on sensing pin 290 with a predetermined current or predeterminated voltage
One signal, and carry out receiving the signal on sensing pin 290 with parameter sampling setup unit 230, to set the voltage conversion
The parameter of controller 295.
As shown in Fig. 2 when the passage of power switch 280 is cut-off, parameter sampling setup unit 230 produces a predetermined current
Or one predeterminated voltage in sensing pin 290, and the series circuit for combining first resistor 240 and second resistance 250 forms one the
Two sensing signals flow through the series circuit of first resistor 240 and second resistance 250 in sensing pin 290, such as predetermined current
And the second sensing signal of a voltage pattern is formed, or predeterminated voltage is biased in first resistor 240 and second resistance 250
Series circuit and formed an electric current pattern second sensing signal.Now parameter samples setup unit 230 by sensing pin 290
Receive and sample the second sensing signal to produce a sample signal.And when the passage of power switch 280 is conducting, foregoing is default
Electric current or predeterminated voltage are closed, while parameter sampling setup unit 230 keeps foregoing sample signal, and are turned to set voltage
The parameter of changer controller 295, and the sensing electric current on the passage of power switch 280 flows through first resistor 240, and in first resistor
The voltage of the first sensing signal is formed on 240, sensing pin 290 is coupled to the first sensing signal simultaneously through second resistance 250
Received, to be used as feedback control.
Fig. 3 is the schematic diagram of the voltage conversion circuit 300 of 3rd embodiment disclosed in this invention.Voltage conversion circuit
300 be the pattern of a step down switching regulator converter (buck switching power converter), by an input electricity
Operation that potential source is depressured and produce a VD, and promote the current loading in output end.Voltage conversion
Circuit 300 includes power switch control unit 310, power switch driver element 320, power switch driver element 325, parameter
Sample setup unit 330, first resistor 340, second resistance 350, conversion inductance 370, power switch 360, power switch 380,
And sensing pin 390.Wherein power switch control unit 310, power switch driver element 320, power switch driver element
325 and parameter sampling setup unit 330 can be voltage conversion controller 395 component units, and its function refers to electricity
Press unit corresponding in switching controller 195.Voltage conversion circuit 300 utilizes a feedback circuit (not shown), determines work(
The ON operation cycle of the passage of rate switch element 360 and switch element 380, and in switch element 360 and switch element
380 tie point forms a pulse wave width modulation signal, is exported via conversion inductance 370 to drive a current loading (in figure not
Show).
In the prior art, when power switch 380 passage for cut-off when, sense pin 390 on not produce or to
Detect significant signal.3rd embodiment disclosed in this invention, in each cycle of pulse width modulation signal, when power is opened
When the passage for closing 380 is cut-off, resistive element is coordinated to produce one on sensing pin 390 with a predetermined current or predeterminated voltage
Signal, and carry out receiving the signal on sensing pin 390 with parameter sampling setup unit 330, to set the voltage conversion control
The parameter of device 395 processed.
As shown in figure 3, when the passage of power switch 380 is cut-off, parameter sampling setup unit 330 produces a predetermined current
Or one predeterminated voltage in sensing pin 390, and the series circuit for combining first resistor 340 and second resistance 350 forms one the
Two sensing signals flow through the series circuit of first resistor 340 and second resistance 350 in sensing pin 390, such as predetermined current
And the second sensing signal of a voltage pattern is formed, or predeterminated voltage is biased in first resistor 340 and second resistance 350
Series circuit and formed an electric current pattern second sensing signal.Now parameter samples setup unit 330 by sensing pin 390
Receive and sample the second sensing signal to produce a sample signal.And when the passage of power switch 380 is conducting, foregoing is default
Electric current or predeterminated voltage are closed, while parameter sampling setup unit 330 keeps foregoing sample signal, and are turned to set voltage
The parameter of changer controller 395, and the sensing electric current on the passage of power switch 380 flows through first resistor 340, and in first resistor
340 upper formation first senses the voltage of signal, and sensing pin 390 senses signal simultaneously through second resistance 350 coupled to first
Received, to be used as feedback control.
The size of second sensing signal in voltage conversion controller 195/295/395 in three above embodiment, by pre-
If the electricity of the size of electric current or predeterminated voltage, the resistance value of first resistor 140/240/340 and second resistance 150/250/350
Resistance determines.Such as predetermined current or the size of predeterminated voltage can be fixed in design, and by changing first resistor 140/
240/340 or the resistance value of second resistance 150/250/350, you can the voltage that adjustment is determined by the size of the second sensing signal
The parameter of switching controller 195/295/395.Such as the output driving electricity of power switch driver element 120/220/320/325
Stream, or the overcurrent protection unit (not shown) in voltage conversion controller 195/295/395, have an overcurrent
Threshold values, determined by the second sensing signal, and when load current is more than overcurrent threshold values, voltage conversion controller 195/295/
The 395 i.e. passage of stop power switch 180/280/360/380.
In addition, in an embodiment, it is sampled with parameter sampling setup unit 130/230/330 and keeps the second sensing
The action of signal, occur in each cycle of pulse wave width modulation signal, it is equivalent on be updated periodically, therefore can be with
The influence of electrical leakage problems is minimized, and the second sensing signal can be handled in a manner of Analog Circuit Design and is subject to profit
With, it also avoid needing to keep the signal received in a digital manner with the larger circuit of analog-digital converter etc,
Thus save the area of circuit and required power consumption.By taking Fig. 1 embodiment as an example, referring to Fig. 8, using power switch
The electric current that the time (grid signal of power switch 180 is the first current potential) of 180 channel conductive carries out needed for normal operating is detectd
Survey time awards, and enters using the time (grid signal of power switch 180 is the second current potential) of the passage cut-off of power switch 180
Row parameter setting.
In another embodiment, parameter samples setup unit 130/230/330 when circuit start, carries out parameter sampling and sets
It is fixed.If it is necessary, then setting value can store in any way, such as be converted to digital value storage.Carry out parameter sampling setting also
It may only need setting once without storing.By taking Fig. 1 embodiment as an example, referring to Fig. 9, can be in voltage conversion controller
When 195 power supplys received are higher than a preset reference level, parameter setting is carried out；This parameter setting such as, but not limited to can be from ginseng
Number sampling setup unit 130 sends out an electric current through sensing pin 190 to outside, is flow to via second, first resistor 150,140
Ground, and the voltage for sensing pin 190 is detected by parameter sampling setup unit 130, it can so be carried out by second resistance 150
Parameter setting.
Furthermore when the integrated circuit that voltage conversion controller 195/295/395 is realized by manufacture of semiconductor, it need to pass through
Stitch in encapsulation makees electrical connection with applications circuit.But under the consideration of size and cost, the stitch in encapsulation
It is for the trend in design that number, which minimizes,.The sensing pin of voltage conversion controller 195/295/395 disclosed in this invention
190/290/390 design, it make use of all types of switch power converters (switching power converter) spy
Property, and on the premise of not increasing stitch number and not influenceing the work of switch power converter circuit, can be with minimum hardware
Resource and the parameter setting that voltage conversion controller is carried out with the parameter of outer member, therefore substantially increase electricity of the invention
Switching controller is pressed to apply upper elasticity, and the competitiveness of product in itself.
It is worth noting that, the voltage conversion controller 195/295/395 in three above embodiment is only used as explanation originally
Invention is used, and not limiting scope disclosed in this invention, such as voltage conversion controller 195/295/395 can be profit
The integrated circuit realized with manufacture of semiconductor, or the equivalent circuit realized by other techniques, voltage conversion controller
195/295/395 can also further include power switch 180/280/360/380 or other element, art technology
Skill that cost consideration and advanced technology when personnel can all apply upper actual demand according to it, design are introduced etc., and
According to spirit disclosed in this invention, implement voltage conversion controller 195/295/395 according to this.
Fig. 4 is the embodiment that parameter disclosed in this invention samples setup unit, and parameter sampling setup unit 400 shows
It is intended to.The parameter sampling setup unit that parameter sampling setup unit 400 can be applied in voltage conversion controller 195/295/395
130/230/330.Parameter sampling setup unit 400 includes setting electric current source 410, configuration switch 420, input buffer stage 430, electricity
Press sample-and-hold circuit 440, parameter input end 490, the first output end of parameter 445 and control terminal 480.
As shown in figure 4, parameter input end 490 is the input that parameter samples setup unit 400, voltage conversion control is coupled to
The sensing pin 190/290/390 of device 195/295/395 processed.Setting electric current source 410 is producing a predetermined current.Configuration switch
420 passage is coupled between setting electric current source 410 and parameter input end 490, and the control terminal of configuration switch 420 is coupled to
Control terminal 480, the signal of control terminal 480 can be with the power component control unit in voltage conversion controller 195/295/395
110/210/310 control signal interlocks, and makes configuration switch 420 when pulse width modulation signal is the first current potential, configuration switch 420
Passage be cut-off, and when pulse width modulation signal be the second current potential, the passage of configuration switch 420 is conducting, and now setting is electric
The predetermined current in stream source 410 flows to parameter input end 490, that is, senses pin 190/290/390, and coordinates first resistor
140/240/340 and second resistance 150/250/350 formed second sensing signal.The corresponding relevant design side of this section of narration
Formula should be those skilled in the art can apparent person, therefore it will not go into details.
As shown in figure 4, the voltage signal of the input response parameter input 490 of buffer stage 430 gives voltage sampling holding circuit
440, input buffer stage 430 can set a voltage gain, voltage sampling holding circuit 440 is had the matter of preferable input signal
Amount.It is worth noting that, input buffer stage 430 and the necessary element of nonparametric sampling setup unit 400, herein as explanation most
Good embodiment is used, and those skilled in the art are contemplated that the choice of hardware cost and signal quality and decide whether that adding input delays
Level 430 is rushed, therefore designs also removable input buffer stage 430, and directly connects the input of voltage sampling holding circuit 440
It is connected to parameter input end 490.
As shown in figure 4, voltage sampling holding circuit 440 has an input 441, an output end 442 and a control terminal
443, input 441 is coupled to the output end of input buffer stage 430, and output end 442 is coupled to the first output end of parameter 445, controls
End 443 processed is coupled to control terminal 480.When pulse width modulation signal is the second current potential, voltage sampling holding circuit 440 is sampling
The signal of parameter input end 490, that is, the second sensing signal, and a sample signal is produced, and be first in pulse width modulation signal
During current potential, voltage sampling holding circuit 440 keeps described sample signal in the first output end of parameter 445.Parameter first exports
The signal at end 445 can be used to set the parameter of voltage conversion controller 195/295/395, such as setting overcurrent protection
The overcurrent threshold values of unit so that when detecting load current and being more than overcurrent threshold values, voltage conversion controller 195/295/
The 395 i.e. passage of stop power switch 180/280/360/380.
In addition, parameter sampling setup unit 400 can further include output buffer stage 450 and voltage turns electric current electricity
Road 460.Output buffer stage 450 has an input and an output end, and the input for exporting buffer stage 450 is coupled to parameter the
One output end 445, the output end for exporting buffer stage 450 then produce parameter setting voltage signal 470 according to the signal of its input,
To set the parameter of voltage conversion controller 195/295/395, such as the overcurrent threshold values of overcurrent protection unit.Output is slow
The size that a voltage gain sets voltage signal 470 with suitably adjusting parameter can be designed by rushing level 450.Voltage-current conversion circuit
460 have an input and an output end, and the input of Voltage-current conversion circuit 460 is coupled to the first output end of parameter 445,
The output end of Voltage-current conversion circuit 460 then produces a parameter setting current signal 485 according to the signal of its input, to set
Determine the parameter of voltage conversion controller 195/295/395, such as the output of power switch driver element 120/220/320/325 is driven
Streaming current.
Fig. 5 is another embodiment that parameter disclosed in this invention samples setup unit, parameter sampling setup unit 500
Schematic diagram.The parameter sampling setting that parameter sampling setup unit 500 can be applied in voltage conversion controller 195/295/395 is single
Member 130/230/330.Parameter sampling setup unit 500 includes setting reference voltage 510, voltage circuit amplifier 520, voltage and returned
Road transistor 530, current sampling holding circuit 540, parameter input end 590, parameter output 550 and control terminal 560.
As shown in figure 5, parameter input end 590 is the input that parameter samples setup unit 500, voltage conversion control is coupled to
The sensing pin 190/290/390 of device 195/295/395 processed.Reference voltage 510 is set to produce a predeterminated voltage.Voltage returns
Road amplifier 520 has two inputs, an output end and Enable Pin 521, and its two input is respectively coupled to setting with reference to electricity
Pressure 510 and parameter input end 590, Enable Pin 521 are coupled to control terminal 560, and the signal of control terminal 560 can be with voltage conversion
The control signal of power component control unit 110/210/310 in controller 195/295/395 interlocks so that works as PWM
When signal is the first current potential, to close, and when pulse width modulation signal is the second current potential, voltage returns voltage circuit amplifier 520
Road amplifier 520 is unlatching.Voltage circuit transistor 530 is a transistor unit, and one end of its passage is coupled to parameter input
End 590, its control terminal is coupled to the output end of voltage circuit amplifier 520.When voltage circuit amplifier 520 is opens, its
The negative feedback loop formed with voltage circuit transistor 530 causes parameter input end 590, that is, senses pin 190/290/
390 voltage, also be setting reference voltage 510 caused by predeterminated voltage value, and coordinate first resistor 140/240/340 with
And second resistance 150/250/350 forms the second sensing signal 591 of electric current pattern.
As shown in figure 5, current sampling holding circuit 540, has input 541, output end 542 and control terminal 543, it is defeated
Enter the other end that end 541 is coupled to the passage of voltage circuit transistor 530, output end 542 is coupled to parameter output 550, controlled
End 543 processed is coupled to control terminal 560.When pulse width modulation signal is the second current potential, current sampling holding circuit 540 is sampling
Second sensing signal 591 simultaneously produces a sample signal, and when pulse width modulation signal is first current potential, current sampling keeps electricity
Road 540 keeps described sample signal in output end 542.The output current signal 551 of parameter output 550 can be used to set
The parameter of voltage conversion controller 195/295/395, such as the output driving of power switch driver element 120/220/320/325
Electric current.
Fig. 6 is the schematic diagram of the embodiment of current sampling holding circuit 540 disclosed in this invention.Current sampling keeps electricity
Road 540 further comprises current input transistor 610, electric current output transistor 620, current sampling switch 630, current sampling electricity
Hold 640 and supply-voltage source 650.
As shown in fig. 6, the passage of current input transistor 610 is coupled between supply-voltage source 650 and input 541,
The control terminal of current input transistor 610 is then coupled to one end of the passage of current sampling switch 630.Electric current output transistor
620 passage is coupled between supply-voltage source 650 and output end 542, and the control terminal of electric current output transistor 620 is then coupled to
The other end and current sampling electric capacity 640 of the passage of current sampling switch 630.The control terminal coupling of current sampling switch 630
In control terminal 543.When the signal of control terminal 543 makes the passage of current sampling switch 630 to turn on, current input transistor
610 and electric current output transistor 620 formed a current mirror (current mirror) circuit, current input transistor 610
On input current 660 reacted for the output current 670 on electric current output transistor 620, imply that current sampling keeps electricity
Road 540 is right against the action that the second sensing signal 591 is sampled, and produces a sample signal, i.e. output current 670.Wherein
Output current 670 for input current 660 enlargement ratio then with current input transistor 610 and electric current output transistor
620 dimensional parameters are related.And when the signal of control terminal 543 changes during the passage of cut-off current sampling switch 630, electric current is defeated
The voltage signal gone out in the control terminal of transistor 620 is kept by current sampling electric capacity 640, therefore output current 670 is kept not
Become, imply that current sampling holding circuit 540 keeps described sample signal, until next cyclomorphosis electricity of pulse width modulation signal
The state of sampling switch 630 is flowed, current sampling holding circuit 540 repeats the action of sampling again.And due in PWM
Under the cycle of signal, the voltage change caused by the leakage current of current sampling electric capacity 640 is quite small, therefore can ignore electric capacity
The effect of leakage current.
Fig. 7 is that parameter samples the Power convert control that setup unit 500 is applied to a flyback switch power converter 700
The embodiment schematic diagram of device 795.The associative operation of flyback switch power converter 700 refers to voltage conversion circuit 100
Explanation.Simply the power switch 780 in flyback switch power converter 700 is bipolar junction transistor (bipolar
Junction transistor, BJT), therefore power switch driver element 720 need to export a driving current and be opened with conducting power
Close 780 passage.If this right driving current is too big in design, then unnecessary power wastage is caused, if too small, then
The service speed of flyback switch power converter 700 and the sacrifice of conversion efficiency are caused, therefore causes the choice in design.
Switch controller of power supply 795 i.e. application parameter disclosed in this invention sampling setup unit 500, using adjusting first resistor 740
Or the resistance value of second resistance 750, change output current signal 551, and to set the output of power switch driver element 720
The value of setting electric current 730 is driven, to determine the output driving current of power switch driver element 720, makes power switch driving single
The characteristic that member 720 is directed to various power switch 780 in different application carries out optimized setting, to meet the work(of different application
The demand of consumption, service speed and conversion efficiency.
In addition, switch controller of power supply 795 can also include output driving predetermined current 760, switching switch 731 and cut
Change switch 761.The passage of switching switch 731 be coupled to output driving setting electric current 730 and power switch driver element 720 it
Between.The passage of switching switch 761 is coupled between output driving predetermined current 760 and power switch driver element 720.Output
Drive the current source that predetermined current 760 is a fixed size.By the conducting for controlling switching switch 731 and switching switch 761
Or cut-off, in that case it can be decided that the output driving current of power switch driver element 720 determines by output driving setting electric current 730, or
It is to be determined by output driving predetermined current 760, or by output driving setting electric current 730 and output driving predetermined current 760
Together decide on.
It is worth noting that, all of above embodiment is of the invention as an example, not limiting institute of the present invention
Scope of disclosure, those skilled in the art all can be according to them using the cost consideration and advanced when upper actual demand, design
Improvement element that technology is introduced etc., and according to spirit disclosed in this invention, implement the present invention according to this.
The effect of of the invention, is, in the startup stage of voltage conversion circuit work or each cycle of normal operating
In, when one on voltage conversion controller senses pin and is not used for feedback control, matched somebody with somebody with a predetermined current or predeterminated voltage
Close resistive element and a signal is produced on sensing pin, and carry out receiving the news on sensing pin with parameter sampling setup unit
Number, to set the parameter of voltage conversion controller.So not only it is not required to additionally increase stitch, moreover it is possible to the hardware more saved
Resource is set to the parameter of voltage conversion controller.Compared with prior art U.S. Patent number US 7,315,190, should
Prior art be using power switch control pin carry out parameter setting, it is of the invention then be using sense pin progress parameter set
Fixed, in addition to pin difference, the present invention can carry out parameter setting in startup stage or each cycle of normal operating, and
The prior art is only capable of carrying out parameter setting in startup stage, therefore the present invention is more extensive compared with the application of the prior art.
Although embodiments of the invention are disclosed as described above, be so not limited to the present invention, any people in the art
Member, without departing from the spirit and scope of the present invention, such as according to the shape described in the claims in the present invention, construction, feature and number
Amount, which is worked as, can do a little change, therefore the scope of patent protection of the present invention must be defined depending on this specification appended claims
Person is defined.
Claims (23)
1. a kind of voltage conversion controller, applied to a voltage conversion circuit, the voltage conversion circuit produces PWM news
Number to operate a power switch therein, to drive a current loading, the pulse width modulation signal is in one first current potential and one
Two current potentials toggle, it is characterised in that the voltage conversion controller includes：
One sensing pin, when the pulse width modulation signal is first current potential, the sensing pin receives one first sensing signal, and
When the pulse width modulation signal is second current potential, the sensing pin receives one second sensing signal；And
One parameter sample setup unit, have an input be coupled to the sensing pin, when the pulse width modulation signal for this second
During current potential, parameter sampling setup unit produces a predetermined current or a predeterminated voltage in the sensing pin to produce second sense
Signal is surveyed, and samples the second sensing signal to produce a sample signal, and when the pulse width modulation signal is first current potential,
Parameter sampling setup unit keeps the sample signal, to set the parameter of the voltage conversion controller.
2. voltage conversion controller as claimed in claim 1, wherein, the voltage conversion circuit also includes a first resistor, should
First sensing signal is voltage signal, and flowing through the first resistor by a sensing electric current is formed, and the sensing electric current and the electric current
The size of load is related.
3. voltage conversion controller as claimed in claim 1, wherein, the voltage conversion circuit also comprising a first resistor and
One second resistance, the second sensing signal is voltage signal, and the first resistor and the second resistance are flowed through by the predetermined current
Series circuit is formed, and the size of the predetermined current is a fixed value.
4. voltage conversion controller as claimed in claim 1, wherein, the voltage conversion circuit also comprising a first resistor and
One second resistance, the second sensing signal is current signal, and the first resistor and the second resistance are biased in by the predeterminated voltage
Series circuit formed, and the size of the predeterminated voltage is a fixed value.
5. voltage conversion controller as claimed in claim 1, wherein, also comprising a power switch driver element, to drive
The power switch, and the output driving current of the power switch driver element is determined by the second sensing signal.
6. voltage conversion controller as claimed in claim 1, wherein, it is excessively electric with one also comprising an overcurrent protection unit
Threshold values is flowed, is determined by the second sensing signal, and when the load current is more than the overcurrent threshold values, the voltage conversion controller
End the passage of the power switch.
7. voltage conversion controller as claimed in claim 3, wherein, parameter sampling setup unit also includes：
One setting electric current source, to produce the predetermined current；
One configuration switch, its passage are coupled between the setting electric current source and the sensing pin, and work as the pulse width modulation signal
For first current potential when, the passage of the configuration switch is cut-off, and when the pulse width modulation signal is second current potential, the setting
The passage of switch is conducting；And
One voltage sampling holding circuit, there is an input and an output end, the input coupling of the voltage sampling holding circuit
Be connected to the sensing pin, when the pulse width modulation signal is second current potential, the voltage sampling holding circuit to sample this
Two sensing signals simultaneously produce the sample signal, and when the pulse width modulation signal is first current potential, the voltage sampling keeps electricity
Lu Yuqi output ends export and keep the sample signal.
8. voltage conversion controller as claimed in claim 7, wherein, parameter sampling setup unit also includes：
One output buffer stage, has an input and an output end, the input of the output buffer stage is coupled to the voltage and taken
The output end of sample holding circuit, the output end of the output buffer stage then produce a parameter setting voltage according to the signal of its input
Signal, to set the parameter of the voltage conversion controller；And
One Voltage-current conversion circuit, has an input and an output end, and the input of the Voltage-current conversion circuit is coupled to
The output end of the voltage sampling holding circuit, the output end of the Voltage-current conversion circuit then produce one according to the signal of its input
Parameter setting current signal, to set the parameter of the voltage conversion controller.
9. voltage conversion controller as claimed in claim 4, wherein, parameter sampling setup unit also includes：
One setting reference voltage, to produce the predeterminated voltage；
One voltage circuit amplifier, has two inputs and an output end, and its two input is respectively coupled to setting reference
Voltage and the sensing pin；
One voltage circuit transistor, it is a transistor, one end of its passage is coupled to the sensing pin, and its control terminal is coupled to this
The output end of voltage circuit amplifier；And
One current sampling holding circuit, there is an input and an output end, the input coupling of the current sampling holding circuit
The other end of the passage of the voltage circuit transistor is connected to, when the pulse width modulation signal is second current potential, the current sampling
Holding circuit signal and produces the sample signal to sample second sensing, and when the pulse width modulation signal is first current potential
When, the current sampling holding circuit keeps the sample signal in its output end.
10. voltage conversion controller as claimed in claim 1, wherein, the voltage conversion circuit turns for flyback Switching Power Supply
Parallel operation, booster switcher power supply changeover device or step down switching regulator converter.
11. a kind of voltage conversion circuit, it is characterised in that include：
One power switch, it is controlled by a pulse width modulation signal to drive a current loading, the pulse width modulation signal is in one first electricity
Position toggles with one second current potential；
One sensing pin, when the pulse width modulation signal is first current potential, the sensing pin receives one first sensing signal, and
When the pulse width modulation signal is second current potential, the sensing pin receives one second sensing signal；And
One parameter sample setup unit, have an input be coupled to the sensing pin, when the pulse width modulation signal for this second
During current potential, parameter sampling setup unit produces a predetermined current or a predeterminated voltage in the sensing pin to produce second sense
Signal is surveyed, and samples the second sensing signal to produce a sample signal, and when the pulse width modulation signal is first current potential,
Parameter sampling setup unit keeps the sample signal, to set the parameter of the voltage conversion circuit.
12. voltage conversion circuit as claimed in claim 11, wherein, the voltage conversion circuit also includes a first resistor, should
First sensing signal is voltage signal, and flowing through the first resistor by a sensing electric current is formed, and the sensing electric current and the electric current
The size of load is related.
13. voltage conversion circuit as claimed in claim 11, wherein, the voltage conversion circuit also comprising a first resistor and
One second resistance, the second sensing signal is voltage signal, and the first resistor and the second resistance are flowed through by the predetermined current
Series circuit is formed, and the size of the predetermined current is a fixed value.
14. voltage conversion circuit as claimed in claim 11, wherein, the voltage conversion circuit also comprising a first resistor and
One second resistance, the second sensing signal is current signal, and the first resistor and the second resistance are biased in by the predeterminated voltage
Series circuit formed, and the size of the predeterminated voltage is a fixed value.
15. voltage conversion circuit as claimed in claim 11, wherein, also comprising a power switch driver element, to drive
The power switch, and the output driving current of the power switch driver element is determined by the second sensing signal.
16. voltage conversion circuit as claimed in claim 11, wherein, it is excessively electric with one also comprising an overcurrent protection unit
Threshold values is flowed, is determined by the second sensing signal, and when the load current is more than the overcurrent threshold values, the passage of the power switch
Cut-off.
17. voltage conversion circuit as claimed in claim 13, wherein, parameter sampling setup unit also includes：
One setting electric current source, to produce the predetermined current；
One configuration switch, its passage are coupled between the setting electric current source and the sensing pin, and work as the pulse width modulation signal
For first current potential when, the passage of the configuration switch is cut-off, and when the pulse width modulation signal is second current potential, the setting
The passage of switch is conducting；And
One voltage sampling holding circuit, there is an input and an output end, its input is coupled to the sensing pin, when this
When pulse width modulation signal is second current potential, the voltage sampling holding circuit takes to sample the second sensing signal and produce this
Sample signal, and when the pulse width modulation signal is first current potential, the voltage sampling holding circuit keeps this to take in its output end
Sample signal.
18. voltage conversion circuit as claimed in claim 17, wherein, parameter sampling setup unit also includes：
One voltage buffer level, has an input and an output end, and the input of the output buffer stage is coupled to the voltage and taken
The output end of sample holding circuit, the output end of the output buffer stage then produce a parameter setting voltage according to the signal of its input
Signal, to set the parameter of the voltage conversion circuit；And
One Voltage-current conversion circuit, has an input and an output end, and the input of the Voltage-current conversion circuit is coupled to
The output end of the voltage sampling holding circuit, the output end of the Voltage-current conversion circuit then produce one according to the signal of its input
Parameter setting current signal, to set the parameter of the voltage conversion circuit.
19. voltage conversion circuit as claimed in claim 14, wherein, parameter sampling setup unit also includes：
One setting reference voltage, to determine the size of the predeterminated voltage；
One voltage circuit amplifier, has two inputs and an output end, and its two input is respectively coupled to setting reference
Voltage and the sensing pin；
One voltage circuit transistor, it is a transistor, one end of its passage is coupled to the sensing pin, and its control terminal is coupled to this
The output end of voltage circuit amplifier；And
One current sampling holding circuit, there is an input and an output end, the input coupling of the current sampling holding circuit
The other end of the passage of the voltage circuit transistor is connected to, when the pulse width modulation signal is second current potential, the current sampling
Holding circuit signal and produces the sample signal to sample second sensing, and when the pulse width modulation signal is first current potential
When, the current sampling holding circuit keeps the sample signal in its output end.
20. voltage conversion circuit as claimed in claim 11, wherein, the voltage conversion circuit is changed for flyback Switching Power Supply
Device, booster switcher power supply changeover device or step down switching regulator converter.
21. a kind of parameter setting method of voltage conversion circuit, the voltage conversion circuit has a voltage conversion controller, and it is produced
For a raw pulse width modulation signal to operate a power switch to carry out voltage conversion, the voltage conversion controller includes a sensing pin
With the sensing electric current of detecting one, and the voltage conversion controller receives a power supply, it is characterised in that the parameter setting method includes：
In the circuit start stage, when the power supply rises above a preset reference level, the voltage conversion controller is through the sensing
Pin sends out a setting electric current to outside；And
According to the voltage of the sensing pin, the parameter of the voltage conversion controller is set.
22. the parameter setting method of voltage conversion circuit as claimed in claim 21, wherein, the voltage conversion circuit is to speed to return
Formula switch power converter, booster switcher power supply changeover device or step down switching regulator converter.
23. the parameter setting method of voltage conversion circuit as claimed in claim 21, wherein, the voltage conversion circuit is to speed to return
Formula switch power converter, the power switch controlling the primary side of a transformer of the flyback switch power converter and
Induced-current is produced in the secondary side of the transformer, and the sensing pin detects the electric current of the primary side.
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| TW103104199 | 2014-02-10 | ||
| TW103104199A TWI509968B (en) | 2013-02-08 | 2014-02-10 | Voltage converter circuit and voltage converter controller and parameter setting method therefor |
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| CN104836420B true CN104836420B (en) | 2018-03-06 |
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| CN102055357A (en) * | 2009-10-27 | 2011-05-11 | 聚辰半导体(上海)有限公司 | Switch power supply controller circuit and switch power supply system |
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| TWI255088B (en) * | 2004-05-24 | 2006-05-11 | Anpec Electronics Corp | DC converting controller with mode-switching and over-current protection by using multifunctional pin and its method |
| US7315190B1 (en) * | 2006-06-16 | 2008-01-01 | Richtek Technology Corp. | PWM circuit and PWM integrated circuit for use in PWM circuit |
| CN101093986B (en) * | 2006-06-19 | 2010-05-12 | 立锜科技股份有限公司 | Pulse width modulation (PDM) circuit, and PDM integrate circuit in use for the PDM circuit |
| US8120931B2 (en) * | 2008-11-18 | 2012-02-21 | Leadtrend Technology Corp. | Power converter with control circuit and related control method |
| CN102244378B (en) * | 2010-05-11 | 2015-06-10 | 立锜科技股份有限公司 | Device and method for protecting IC (integrated circuit) |
| CN102255613B (en) * | 2010-05-18 | 2015-05-27 | 立锜科技股份有限公司 | Parameter setting circuit and method for integrated circuit |
| US8988902B2 (en) * | 2011-11-15 | 2015-03-24 | Dialog Semiconductor, Inc. | Power converter controller IC having pins with multiple functions |
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| CN102055357A (en) * | 2009-10-27 | 2011-05-11 | 聚辰半导体(上海)有限公司 | Switch power supply controller circuit and switch power supply system |
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