CN103856058B - Voltage conversion circuit and voltage conversion controller - Google Patents
Voltage conversion circuit and voltage conversion controller Download PDFInfo
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- CN103856058B CN103856058B CN201310178681.6A CN201310178681A CN103856058B CN 103856058 B CN103856058 B CN 103856058B CN 201310178681 A CN201310178681 A CN 201310178681A CN 103856058 B CN103856058 B CN 103856058B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 112
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Abstract
The invention relates to a voltage conversion circuit, which comprises an application circuit and a voltage conversion controller. The application circuit comprises an output end, a feedback end and a feedback capacitor coupled to the feedback end. The output terminal has an output voltage and is coupled to a current load. The voltage conversion controller has a feedback terminal pin coupled to the feedback terminal. The voltage conversion controller has a first mode and a second mode. In the first mode, the output terminal provides a regulated output voltage and supplies current to the current load, and the feedback pin receives a feedback signal. In the second mode, the output voltage is not regulated, the feedback pin provides a constant periodic counting frequency signal, and the period of the counting frequency signal is determined by the capacitance of the feedback capacitor.
Description
[technical field]
The present invention is about a kind of voltage conversion circuit, and a kind of voltage conversion comprising multi-functional single stitch is controlled
The voltage conversion circuit of device processed.
[background technology]
Refer to U.S. Patent number US7,848,124.Voltage conversion controller is to be applied to a flyback Switching Power Supply turn
Change among circuit (fly-back switching power converter).Flyback switch power converter is voltage conversion
The one of circuit configurations, its purpose is providing a stable output voltage.When described flyback Switching Power Supply change-over circuit is in
During steady state operation, described voltage conversion controller is controlled by negative feedback, is adjusted for its output voltage
(regulation), to provide a stable and specified output voltage values and output electric current to give a current loading.Now it is born
Back coupling controls have a signal on the back coupling point IN3 on path, is the signal exporting size of current linear correlation for it, institute
State voltage conversion controller and i.e. carry out negative feedback control according to the signal feedback on some IN3.And when described flyback Switching Power Supply
When change-over circuit is in non-steady state operation, such as, carry out load current excessive protection operation, or electricity when load current is excessive
During the soft start operation of road initial start, the most specified output voltage values does not also set up, and feedbacks on some IN3 due to described
Signal is relevant to the signal of outfan, and the signal now feedback on an IN3, after the transient response that experience is of short duration, is finally one
Continuous print DC voltage signal, and circuit operation is not provided to the function with real benefit.
In current mainstream applications, voltage conversion controller generally realizes with integrated circuit, and coordinates the application of outside
Circuit composition voltage conversion circuit, to reach cost, circuit volume and to use the optimization in elasticity.Described integrated circuit bag
Containing the stitch (pins) being electrical connected with external electronic components, and it is this optimization with volume of hoping for success, is not affecting use elasticity
On the premise of, the stitch number of integrated circuit can more better.The most in design, if stitch can be allowed to make at all of circuit
Under state, it is provided that have the function of real benefit, it it is i.e. the Optimum utilization to stitch.With the prior art of the example above and
Speech, the stitch of its representative back coupling point, when voltage conversion controller is in non-steady state operation, does not provide on circuit operation
Having the function of real benefit, this is the universal phenomenon of the most general voltage conversion controller integrated circuit.
[summary of the invention]
In view of this, the present invention provides a kind of voltage conversion circuit, comprises a voltage conversion controller, is an integrated electricity
Road, and described voltage conversion controller is provided that have multi-functional single stitch, optimizes the utilization to stitch according to this.
The voltage conversion circuit that disclosed herein, comprises an application circuit and a voltage conversion controller.Application circuit
Comprise an outfan, a feedback end and be coupled to a back coupling electric capacity of feedback end.Outfan has an output voltage, and couples one
Current loading.Voltage conversion controller has a feedback end stitch, is coupled to described feedback end.Voltage conversion controller has one
First mode and one second pattern.When described first mode, described outfan provides modulated output voltage and supplies
Electric current gives current loading, and feedback end stitch receives a feedback signal.When described second pattern, described output voltage is the most modulated
Joint, and described feedback end stitch provide fixed cycle property a count frequency signal, the cycle size of count frequency signal be by
The capacitance of back coupling electric capacity is determined.
Effect of the present invention is, the technical characteristic that disclosed herein can save the usage amount of integrated circuit stitch,
Thus can be the most cost-effective；And the voltage conversion controller of same design can be used in various different application, also because of
And reduce the version quantity that integrated circuit package is derived in response to various different application, and simplify manufacturer's production, stock, management
Problem.
Feature for the present invention, implementation and effect, hereby coordinate graphic most preferred embodiment of making to describe in detail as follows.
[accompanying drawing explanation]
Fig. 1 is the circuit diagram of the electric pressure converter of the present invention.
Fig. 2 is the composition function block schematic diagram of the voltage conversion controller of the present invention.
Fig. 3 is the voltage conversion controller of present invention when carrying out soft start operation, the voltage waveform signal of each primary endpoint
Figure.
Fig. 4 is the voltage waveform view of Tu3Zhong local magnification region.
Fig. 5 is the voltage conversion controller of present invention when carrying out exporting overcurrent protection operation, the voltage of each primary endpoint
Waveform diagram.
Fig. 6 is among the voltage conversion controller of the present invention, the circuit diagram of oscillating controller.
Primary clustering symbol description:
100 electric pressure converter 151 optical sensing subassemblies
110 power-supply unit 243 second current switches
111 bridge full wave rectifier 244 second current components
112 input electric capacity of voltage regulation 245 internal source voltages
113 first siding ring 251 enumerators
130 output unit 252 SS (soft start) control circuits
131 second siding ring 253 overload protection control circuits
Logic circuit closed by 132 outfan diodes 254
133 output electric capacity of voltage regulation 255 oscillating controllers
134 first feedback resistance 280 charge-discharge circuits
135 second feedback resistance 310 output voltage waveforms
The output waveform of 136 current-limiting resistance 320 oscillating controllers
The voltage waveform of 137 light emitting diode 330 feedback end stitch
First comparing voltage value of 138 three-terminal shunt regulator 331 oscillating controllers
Second comparing voltage value of 150 feedback circuit unit 332 oscillating controllers
Output 241 first current components of 340 threshold currents controlled stages
Waveform 242 first current switch
341 threshold currents controlled stages are in the voltage waveform of stable state 350 induced current voltage foot
Equivalent threshold currents under Cao Zuo
Magnitude of voltage
The region of 152 back coupling electric capacity 360 340 and 350 partial enlargement waveforms
The output waveform of 170 power switch unit 510 overload protection control circuits
171 power switch 520 oscillating controller output waveforms
The voltage waveform of 172 induced current resistance 530 feedback end stitch
First comparing voltage value of 200 voltage conversion controller 531 oscillating controllers
210 power switch control the second comparing voltage value of foot 532 oscillating controller
The output waveform of 211 power switch driving stage 540 threshold currents controlled stages
The voltage waveform of 212 PWM latch unit 550 induced current voltage feet
213 internal oscillator 610 controller inputs
214 PWM comparator 620 controller output ends
215 threshold currents controlled stage 630 first comparators
220 induced current voltage foot 640 second comparators
221 gain stages 650 first compare voltage
230 grounding legs 660 second compare voltage
240 feedback end stitch 670 set and reset latch unit
[detailed description of the invention]
In the middle of description and follow-up claim, " coupling " word at this be comprise any directly and indirectly
Electrical connection.Therefore, if a first device is coupled to one second device described in literary composition, then representing described first device can be straight
Connect and be electrically connected in described second device, or be indirectly electrically connected to described second dress by other device or connection means
Put.
Fig. 1 is the circuit diagram of a voltage conversion circuit 100.Voltage conversion circuit 100 is a flyback Switching Power Supply
The configuration of change-over circuit.Voltage conversion circuit 100 comprises voltage conversion controller 200 and an application circuit of the present invention.Should
An outfan and feedback end COMP is comprised with circuit.Outfan has an output voltage, and couples a current loading.Voltage turns
Changer controller 200 further includes power-supply unit 110, output unit 130, feedback circuit unit 150 and a power
Switch element 170.
As it is shown in figure 1, power-supply unit 110 include one bridge full wave rectifier 111, an input electric capacity of voltage regulation 112, with
And a first siding ring 113.
Bridge full wave rectifier 111 is alternating current power supply VAC that inputs to be carried out all wave rectification and provide an all wave rectification
Result exports in it.
Input electric capacity of voltage regulation 112 is coupled to the output of bridge full wave rectifier 111, and carries out all wave rectification result surely
Pressure, to produce an input voltage VIN on input electric capacity of voltage regulation 112.
First siding ring 113 has the first end points and the second end points, and the first end points is coupled to input electric capacity of voltage regulation 112.
The main function of power-supply unit 110 is to provide input voltage VIN to give first siding ring 113.
As it is shown in figure 1, output unit 130 comprises second siding ring 131, outfan diode 132, output voltage stabilizing
Electric capacity 133,1 first feedback resistance 134,1 second feedback resistance 135, current-limiting resistance 136, light emitting diode 137, with
And a three-terminal shunt regulator 138.
Second siding ring 131 has the first end points and the second end points, and has mutual inductance relationships with first siding ring 113 and formed
One transformer device.
The positive terminal of outfan diode 132 is coupled to the first end points of second siding ring 131.Outfan diode 132
Negative pole end be coupled to export one end of electric capacity of voltage regulation 133, and form the anode VOP of an outfan.
The other end of output electric capacity of voltage regulation 133 is coupled to the second end points of second siding ring 131, and forms an outfan
Negative terminal VON.Wherein provide an output voltage between the anode VOP and the negative terminal VON of outfan of outfan.
First feedback resistance 134 is coupled between the anode VOP of outfan and one end of the second feedback resistance 135.Second
The other end of feedback resistance 135 is coupled to the negative terminal VON of outfan.First feedback resistance 134 and the company of the second feedback resistance 135
Contact provides output voltage dividing potential drop VFB, and is coupled to the input of three-terminal shunt regulator 138.
One end of current-limiting resistance 136 is coupled to the anode VOP of outfan, and the other end is just being coupled to light emitting diode 137
End.
The negative terminal of light emitting diode 137 is coupled to the output plus terminal of three-terminal shunt regulator 138.Three-terminal shunt regulator
The output negative terminal of 138 is coupled to the negative terminal VON of outfan.
As it is shown in figure 1, three-terminal shunt regulator 138 comprises a reference voltage level, when the voltage of input is more than described ginseng
Examine magnitude of voltage, be the state of a conducting between output plus terminal and the output negative terminal of three-terminal shunt regulator 138.Anti-, when it is defeated
Enter the voltage of end less than described reference voltage level, be not one not between output plus terminal and the output negative terminal of three-terminal shunt regulator 138
The state of conducting.Therefore, when output voltage dividing potential drop VFB is more than described reference voltage level, the output of three-terminal shunt regulator 138
Conducting, and on light emitting diode 137, form electric current, and size of current is limited by current-limiting resistance 136, now light-emitting diodes
Pipe 137 forms the light source of a luminescence；And when output voltage dividing potential drop VFB is less than described reference voltage level, three-terminal shunt regulator
The output of 138 is not turned on, and light emitting diode 137 does not have electric current, that is light emitting diode 137 is the most luminous.
As it is shown in figure 1, power switch unit 170 comprises power switch 171 and an induced current resistance 172.Power switch
The output of 171 is connected in series with induced current resistance 172, and is coupled between the second end points and the earth terminal of first siding ring 113.When
When power switch 171 is opened, input electric capacity of voltage regulation 112, first siding ring 113, power switch 171 and induced current resistance 172 are i.e.
Form a current loop.Owing to first siding ring 113 is an inductive assembly, the formation of the most described current loop will store
Energy is on first siding ring 113.It addition, the current signal on described current loop is transferred to voltage news by induced current resistance 172
Number VCS.When power switch 171 is closed, the storage energy on first siding ring 113 is by being formed with second siding ring 131
Transformer device, discharge to second siding ring 131 and form an electric current thereon, and be in stable state in voltage conversion circuit 100
During operation, between the anode and negative terminal of outfan, set up specified output voltage VO UT, and provide electric current give be serially connected with defeated
Go out the current loading (not shown) between anode and the negative terminal of end.
As it is shown in figure 1, feedback circuit unit 150 comprises optical sensing subassembly 151 and a back coupling electric capacity 152.Light sensing
Assembly 151 and light emitting diode 137 form the configuration of a photo-coupler, when light emitting diode 137 forms the light source of a luminescence, light
Sensing component 151 i.e. detects described light source and forms an electric current thereon, and the intensity of described size of current and described light source
Proportional.It follows that utilize described transformator and described photo-coupler, can by the side of input ac power with
The side of outfan makees the isolation on electrically completely.
As it is shown in figure 1, optical sensing subassembly 151 is connected in parallel with back coupling electric capacity 152 and is coupled to the feedback end of application circuit
Between COMP and earth terminal.Described voltage conversion controller 200 is an integrated circuit unit, and has multiple stitch.Stitch bag
Foot 210, induced current voltage foot 220, grounding leg 230 and feedback end stitch 240 is controlled containing power switch.Power switch controls foot
The 210 control ends being coupled to power switch 171, use the open and close controlling power switch 171.Induced current voltage foot 220 connects
By voltage signal VCS produced by induced current resistance 172.Grounding leg 230 is then coupled to earth terminal.Feedback end stitch 240 then couples
In feedback end COMP.
Fig. 2 is the composition function block schematic diagram of voltage conversion controller 200.Voltage conversion controller 200 further includes one
First current components 241,1 first current switch 242,1 second current switch 243,1 second current components 244, is internal
Voltage source 245, one enumerator 251, SS (soft start) control circuit 252, overload protection control circuit 253, closes logic electricity
Road 254, one oscillating controller 255, power switch driving stage 211, PWM latch unit 212, internal oscillator
213, PWM comparator 214, threshold currents controlled stage 215 and a gain stage 221.
First current components 241 is coupled to internal source voltage 245 and one end of the first current switch 242.
The other end of the first current switch 242 is coupled to feedback end stitch 240.
First current components 241 defines a switching current assembly with concatenating of the first current switch 242, wherein the first electricity
Stream assembly 241 can be resistor assembly or be current source assembly.
Second current components 244 is coupled to grounding leg 230 and one end of the second current switch 243.Second current switch 243
The other end be coupled to feedback end stitch 240.
Second current components 244 defines another switching current assembly with concatenating of the second current switch 243, and wherein second
Current components 244 can be resistor assembly or be current source assembly.
The input of oscillating controller 255 is coupled to feedback end stitch 240, and the unstable state behaviour of voltage conversion circuit 100
When making, produce a period frequency signal in its outfan, use control the first current switch 242 and the second current switch 243
Unlatching and closedown.
The outfan of oscillating controller 255 is also coupled to enumerator 251.Enumerator 251 is non-voltage conversion circuit 100
During steady state operation, export a result and give SS (soft start) control circuit 252 and export another result and give overload protection control circuit 253.
Overload protection control circuit 253, then according to setting, controls to close logic circuit 254, to decide whether temporary close
Voltage conversion controller 200.
It is defeated that PWM comparator 214 has an anode input, one first negative terminal input, one second negative terminal input and one
Go out.The input of its first negative terminal is coupled to feedback end stitch 240.Its output is coupled to enumerator 251.
The input of gain stage 221 is coupled to induced current voltage foot 220, and the output of gain stage 221 is coupled to PWM and compares
The anode input of device 214.Gain stage 221 is to be inputted signal to export after suitable linear amplification again.Threshold currents controlled stage
215 provide the magnitude of voltage of an equivalence threshold currents to export in it, and are coupled to the second negative terminal input of PWM comparator 214.
PWM latch unit 212 has a set input, replacement input and an outfan.Reset input
It is coupled to the output of PWM comparator 214.Internal oscillator 213 provides a PWM operation frequency, and is coupled to arteries and veins
The set input of width modulation latch unit 212.
Power switch driving stage 211 has an input and an outfan, and its input is coupled to PWM breech lock
The outfan of device 212, the outfan of power switch driving stage 211 is coupled to power switch and controls foot 210, and according to its input
Input signal drive power switch 171 to control the capacity load of end.
Voltage conversion controller 200 fit applications circuit, to set up voltage conversion circuit 100 as shown in Figure 1.Voltage turns
Changer controller 200 at least has first mode and the second pattern, such as steady state operation and non-steady state operation.And at the first mould
Under formula, feedback end stitch 240 receives a feedback signal, and under the second mode, feedback end stitch 240 provides count frequency news
Number.No matter described feedback signal and described count frequency signal all have difference in the mode formed and operational effect.
When the steady state operation of voltage conversion circuit 100, voltage conversion controller 200 is just feedbacking control and regulation outfan
Current loading between end VOP and negative terminal VON, and provide a modulated rated output voltage VOUT in output voltage.So-called
Modulated person, refers to when applications circuit and each parameter of current loading produce the change being in specification limit, voltage
Switching controller 200 all can react with its negative feedback control mechanism coordinating applications circuit to be set up, so that output
Voltage is maintained at a specified VOUT.
When voltage conversion circuit 100 is in non-steady state operation, voltage conversion controller 200 fit applications circuit, will enter
What row was necessary reacts with each assembly in protection voltage conversion controller 200, application circuit and current loading, makes to answer electricity consumption
Road avoids causing device breakdown or other misoperation because of overvoltage or the situation of overcurrent.Common non-steady state operation anti-
The locking of soft start, input voltage deficiency, the too high protection of output voltage, output overcurrent protection etc. should be included.The reality of the present invention
Execute example by the steady state operation with voltage conversion circuit 100, and the non-steady state operation of soft start, output overcurrent protection carries out skill
The explanation of art feature, is hereby described as follows.
When voltage conversion circuit 100 is in steady state operation, output voltage is a ripple wave shape, and described ripple wave shape
Average voltage is rated output voltage VOUT.Cycle behavior and the voltage conversion controller of described ripple wave shape is explained in examination
The regulation action of 200 is as follows.
Cycle, the internal oscillator 213 of voltage conversion controller 200 exported pulse wave, to trigger PWM at the beginning
The set input of latch unit 212 and produce signal " 1 " in triggering the outfan of PWM latch unit 212, now power is opened
Closing driving stage 211 then drives the control end of power switch 171 to open power switch 171, and forms a current loop and stores
Energy is on first siding ring 113.The most described transformator then do not provide electric current in described outfan, therefore the electric current on outfan
The required electric charge of load comes from exporting electric capacity of voltage regulation 133, and the most described output voltage linearly declines.And due to first siding ring
Electric current on electric current on 113, that is power switch 171 persistently rises, therefore the voltage signal VCS on induced current voltage foot 220
The most persistently rise, until VCS is more than the magnitude of voltage on feedback end stitch 240, now PWM comparator 214 output signal
" 1 " produces signal " 0 " in the outfan of PWM latch unit 212, merit to the replacement input of PWM latch unit 212
Rate switch drive level 211 thus closes off power switch 171.Storage energy on first siding ring 113 then by with secondary side line
The transformer devices that formed of circle 131, discharge to second siding ring 131 and form an electric current thereon, and use offer electric current and give
Output electric capacity of voltage regulation 133 is also charged by load current.The most described output voltage linearly rises, until internal oscillator
213 produce next pulse wave, and open power switch 171.Voltage conversion circuit 100 the most periodically operates.
And when the current value of load current increases, enough electric currents temporarily cannot be provided to give due to voltage conversion circuit 100
Load current, therefore by exporting the additional charge that electric capacity of voltage regulation 133 provides required, thus result in output voltage and decline.Now export
When dividing potential drop VFB of voltage is less than the reference voltage of three-terminal shunt regulator 138, the output plus terminal of three end parallel connection depressors 138 with
It is not turned between output negative terminal, that is the output of light emitting diode 137 does not have electric current and the most luminous.Optical sensing subassembly 151 is the most not
Detect light source, thus on it, the most do not have electric current.And when steady state operation, the first current switch 242 switch conduction, and the second electricity
Stream switch 243 then switchs cut-off.When optical sensing subassembly 151 does not has electric current, the first current components 241 provides an electric current to back coupling
Electric capacity 152 charges, and the magnitude of voltage on feedback end stitch 240 rises, and causes when first siding ring 113 carries out storing energy,
Upper current limit of its operation improves, and also can store relatively multi-energy, thus when the lower half cycle, release was to second siding ring 131 energy
Offer one bigger electric current is needed for providing output unit 130, and is adjusted output voltage, to reply its rated voltage
VOUT。
Otherwise, when the current value of load current reduces, owing to voltage conversion circuit 100 provides too much electric current to give outfan,
Output electric capacity of voltage regulation 133 is i.e. charged by unnecessary electric current, and causes output voltage to rise.Now dividing potential drop VFB of output voltage is big
When the reference voltage of three end parallel connection depressors 138, lead between output plus terminal and the output negative terminal of three end parallel connection depressors 138
Logical, that is light emitting diode 137 forms electric current and luminous.Optical sensing subassembly 151 detects light source, thus forms electric current on it,
And cause back coupling electric capacity 152 to discharge.Magnitude of voltage on feedback end stitch 240 declines, that is when first siding ring 113 stores
During energy, the upper current limit of its operation declines, that is stores less energy, thus discharges to second siding ring in the lower half cycle
There is provided a less electric current to give output unit 130 when 131, thereby output voltage is adjusted, to reply its rated voltage
VOUT.By the transient behavior caused by the change of above load current, voltage conversion controller 200 be can be observed and utilize itself and application
The negative feedback control mechanism that circuit is set up, can make the operation of correspondence, and be adjusted output voltage, so that output voltage
It is maintained at a specified voltage VOUT.Or claim voltage conversion circuit 100 to be now in the state of a steady state operation.It addition, by upper
Stating operation to understand, the magnitude of voltage on feedback end stitch 240 is linear to the size of current of described load current relevant, and this is an electricity
Stream mode controls the characteristic that the electric pressure converter of (current-mode control) is had.But in other voltage conversion
In device configuration, such as, control in the electric pressure converter of (voltage-mode control) at a voltage mode, feedback end stitch
Magnitude of voltage on 240 is then linear to output voltage size relevant, and this technical characteristic disclosed for prior art is the most another at this
Repeat.
And when described voltage conversion controller 200 just starts to start, the steady state operation of output voltage is not yet set up, that is
Voltage conversion circuit 100 is in the state of a non-steady state operation.The most described voltage conversion controller 200 i.e. carries out soft start behaviour
Make, and set up the steady state operation of output voltage, so that voltage conversion circuit 100 reaches the state of steady state operation.Soft start operation
Can be effectively prevented from circuit when just starting to start, in circuit, each assembly operates in extreme condition and reduces its service life, and
In surging produced by power-supply unit 110 when can reduce circuit start.The time that soft start operation allows is the longest, its energy
Better, but the circuit start time must take into the system specification in application and generally has a maximum protected effect reached
Limit, thus form the choice in design.The soft start operation of voltage conversion controller 200 will coordinate the oscillogram explanation of Fig. 3
's.
Fig. 3 is voltage conversion controller 200 when carrying out soft start operation, the voltage waveform view of each primary endpoint.Its
In 310 be output voltage waveforms, 320 is the output waveform of oscillating controller 255, and 330 is the voltage wave on feedback end stitch 240
Shape, 331 is one first comparing voltage value of oscillating controller 255, and 332 is one second comparing voltage value of oscillating controller 255,
340 output waveforms being limited current control level 215,341 current control level 215 that are limited are in stable state at voltage conversion circuit 100
The magnitude of voltage of the equivalent threshold currents under Cao Zuo, 350 is the voltage waveform on induced current voltage foot 220, i.e. the voltage waveform of VCS, 360
For 340 shown in Fig. 4 and the region of 350 partial enlargement waveforms.
As it is shown on figure 3, owing to the output of oscillating controller 255 is to control to open the first current switch 242 and the second electricity
The one of both of stream switch 243, and when voltage conversion controller 200 starts at the beginning, the voltage on feedback end stitch 240 is little
In the first comparing voltage value 331, therefore the first current switch 242 is unlocked, and the first current components 241 provides an electric current to flow into back
Award the end points of end stitch 240, due to output voltage and do not set up, react to optical sensing subassembly 151 that i.e. it does not have an electric current, therefore the
Back coupling electric capacity 152 is i.e. charged by the electric current that one current components 241 provides, and therefore the voltage on feedback end stitch 240 persistently rises,
Until more than the first comparing voltage value 331, the now output of oscillating controller 255 changes, the first current switch 242 switch cuts
Stop, and the second current switch 243 switch conduction.Now the second current components 244 provides an electric current to flow out feedback end stitch 240
End points, causes back coupling electric capacity 152 to discharge, and therefore the voltage on feedback end stitch 240 starts continuous decrease, until less than the second ratio
Relatively magnitude of voltage 332, the now output of oscillating controller 255 changes, the first current switch 242 switch conduction, and the second electric current is opened
Close 243 switch cut-offs, and the voltage on feedback end stitch 240 starts persistently to rise, and eventually forms periodic wave as indicated at 330
Shape part.And the output of oscillating controller 255 also forms periodic waveform part as shown at 320.It addition, the described cycle is big
I is directly determined by the capacitance of back coupling electric capacity 152.
Further illustrate, oscillating controller the 255, first current components the 241, first current switch the 242, second current switch
243 and second the combination of current components 244 form a charge-discharge circuit 280, as shown in Figure 2.Described charge-discharge circuit
280 is when the second pattern, described back coupling electric capacity 152 is carried out periodic discharge and recharge, to form aforesaid periodic waveform.
Wherein oscillating controller 255 rises to the first comparing voltage value 331 respectively at the voltage of back coupling electric capacity 152 and drops to the second ratio
Relatively during magnitude of voltage 332, change the outputting level of oscillating controller 255.
As it is shown on figure 3, under soft start operation, the output of threshold currents controlled stage 215 is the most at the beginning as shown in 341
Magnitude of voltage, but in the way of segment increasing, carry out the threshold currents size of setting power switch 171, to reach the guarantor of soft start
Protection circuit assembly and the purpose of minimizing circuit surging.Fig. 4 show the region 360 of 340 and 350 partial enlargement waveforms in Fig. 3.
When internal oscillator 213 sends pulse wave to open power switch 171, the now voltage waveform 350 on induced current voltage foot 220,
I.e. VCS, is a waveform ramped, until more than the value set by threshold currents controlled stage 215, that is 340 in figure so that
PWM comparator 214 exports " 1 ", and closes described power switch 171, until internal oscillator 213 sends arteries and veins next time
Ripple.The periodicity signal of the VCS in therefore defining such as figure.
Go back to Fig. 3.As it is shown on figure 3, the enumerator 251 in voltage conversion controller 200 can utilize aforementioned vibration control
The periodic waveform that the output of device 255 processed is formed, carry out counting and and by result export to SS (soft start) control circuit 252, soft
Start control circuit 252 i.e. progressively the output of threshold currents controlled stage 215 to be increased according to the result of counting, to reach soft start
Operation.It should be noted that the cycle of the output of oscillating controller 255, by determining the time span of soft start operation, therefore exist
In circuit application, user can set by directly changing the capacitance of the back coupling electric capacity 152 outside voltage conversion controller 200
The time of meter soft start operation, and make the voltage conversion controller 200 of same design can be used in various different application, because of
And reduce the version quantity that integrated circuit package is derived in response to various different application, and simplify manufacturer's production, stock, management
Problem.
It addition, when voltage conversion circuit 100 is in steady state operation, if load current increases, and more than voltage conversion electricity
The output electric current that road 100 can be supplied, now can carry out exporting the unstable state of overcurrent protection by trigger voltage switching controller 200
Operation.The purpose of output overcurrent protection, is that preventing circuit unit to be constantly in damages under too high current practice situation
Ruin, even cause burning to cause using the anxiety of safety.The output overcurrent protection operation of voltage conversion controller 200 will
Coordinate the oscillogram explanation of Fig. 5.
Fig. 5 be voltage conversion controller 200 carry out export overcurrent protection operation time, the voltage waveform of each primary endpoint shows
It is intended to.Wherein 510 is the output waveform of described overload protection control circuit 253, and 520 is the output waveform of oscillating controller 255,
530 is the voltage waveform on feedback end stitch 240, and 531 is one first comparing voltage value of oscillating controller 255, and 532 is vibration
One second comparing voltage value of controller 255,540 output waveforms being limited current control level 215,550 is induced current voltage foot 220
On voltage waveform, i.e. the voltage waveform of VCS.
As it is shown in figure 5, voltage conversion circuit 100 is in the state of steady state operation at the beginning.When a time point t1, it is defeated
The load current going out end increases, and the output electric current can supplied more than voltage conversion circuit 100, now due to voltage conversion electricity
The supply current capacity on road 100 is not enough, causes output voltage to be consistently less than rated output voltage VOUT.Reaction is to optical sensing subassembly
151 is not detect light source, thus does not have electric current on it.Therefore back coupling electric capacity 152 held by the electric current of the first current components 241
Continuous charging, the voltage on feedback end stitch 240 persistently rises, until more than the first comparing voltage value 531, now oscillating controller
The output of 255 changes, and closes the first current switch 242, and opens the second current switch 243.
Now the second current components 244 provides an electric current to flow out the end points of feedback end stitch 240, causes back coupling electric capacity 152
Electric discharge, therefore the voltage on feedback end stitch 240 starts continuous decrease, until less than the second comparing voltage value 532, now vibrating
The output of controller 255 changes, and opens the first current switch 242, and closes the second current switch 243, and feedback end stitch
Voltage on 240 starts persistently to rise, and eventually forms periodic waveform part as indicated at 530.And oscillating controller 255 is defeated
Go out the periodic waveform part also formed as depicted 520.It addition, the big I in described cycle is directly by the electricity of back coupling electric capacity 152
Capacitance determines.
As it is shown in figure 5, the enumerator 251 in voltage conversion controller 200 can utilize the defeated of aforementioned oscillating controller 255
Go out formed periodic waveform to count, and send signal when reaching a pre-set count values and give overload protection control circuit
253, carry out exporting the action of overcurrent protection, such as notice and close logic circuit 254, with continuously off power switch 171
No longer export electric current.As shown during t2 in Fig. 5, now the output waveform 510 of overload protection control circuit 253 sends pulse wave,
Power switch 171 ends, the voltage waveform 550 on induced current voltage foot 220, i.e. the voltage of VCS is then continuously 0.
From the operation of the present embodiment, when voltage conversion circuit 100 is in the state of steady state operation, described back coupling is interrogated
Number, that is the voltage signal on feedback end stitch 240, it is linearly related to export size of current, to provide voltage conversion controller
200 negative feedbacks being adjusted output voltage control required signal, or also may be interpreted as the voltage signal on feedback end stitch 240
It is the loop controlled by described negative feedback and associated component is produced.And PWM comparator 214 receives feedback end stitch
Voltage signal on 240, to carry out dynamic operation.And when voltage conversion circuit 100 is in the state of non-steady state operation, described
Voltage signal on count frequency signal, that is feedback end stitch 240, then be a periodic signal, and cycle size be by outward
The capacitance of the back coupling electric capacity 152 in portion determines, thus provides a frequency size and be relatively accurately available for the frequency news of counting
Number, needed for non-steady state operation, or also to may be interpreted as the voltage signal on feedback end stitch 240 be by the first current components
241, first current switch the 242, second current switch the 243, second current components 244, internal source voltage 245, oscillating controller
255 and feedback electric capacity 152 produced.And oscillating controller 255 receives the voltage on feedback end stitch 240, and carry out dynamically
Operation.Understand the voltage signal on feedback end stitch 240 under two kinds of modes of operation of voltage conversion circuit 100, be by described
Voltage conversion controller circuit composition different from described application circuit is produced, and each provides difference in functionality but for electric
Signal necessary to dataway operation gives two electronic circuits in voltage conversion controller 200, i.e. PWM comparator 214 and shaking
Swing controller 255.Review the voltage on the feedback end stitch of voltage conversion controller in prior art then under any state all
Produced by same circuits composition, and be only capable of when electric pressure converter is at steady state operation providing significant signal for utilization.
Therefore the technical characteristic that disclosed herein can save the usage amount of integrated circuit stitch, thus can be the most cost-effective；And
The voltage conversion controller of same design can be used in various different application, also thus reduce integrated circuit package in response to respectively
Plant the version quantity that different application is derived, and simplify manufacturer's production, stock, the problem of management.
Fig. 6 show among voltage conversion controller 200, described in swing a circuit embodiments of controller 255.Vibrational control
Device 255 comprise controller input 610, controller output end 620,1 first comparator 630,1 second comparator 640,
One first compares voltage 650,1 second compares voltage 660 and a setting replacement latch unit 670.Controller input 610 coupling
It is connected to feedback end stitch 240, and the signal of controller output end 620 is opened with the second electric current in order to control the first current switch 242
Close the on or off of 243.First comparator 630 has a positive input terminal, a negative input end and an outfan, wherein said
Positive input terminal is coupled to controller input 610, and described negative input end is coupled to first and compares voltage 650.Second comparator
640 have a positive input terminal, a negative input end and an outfan, and wherein said negative input end is coupled to controller input
610, and described positive input terminal is coupled to second and compares voltage 660.Set reset latch unit 670 have a set input, one
Resetting input and an outfan, wherein said set input is coupled to the outfan of the first comparator 630, described heavy
Put input and be coupled to the outfan of the second comparator 640, and set and reset the outfan of latch unit 670 to be coupled to controller defeated
Go out end 620.
As shown in Figure 6, it is commonly designed first to compare voltage 650 and compare voltage 660 more than second.When controller input
When the voltage of 610 compares voltage 660 less than second, the second comparator 640 exports " 1 " and gives the replacement setting replacement latch unit 670
Input, thus controller output end 620 is output as " 0 ".When the voltage of controller input 610 compares voltage more than first
When 650, the first comparator 630 exports " 1 " and gives and set the set input resetting latch unit 670, thus controller output end 620
It is output as " 1 ".Compare between voltage 660 with second when voltage circle of controller input 610 compares voltage 650 in first
Time, the first comparator 630 and the second comparator 640 all export " 0 ", set the output resetting latch unit 670, that is controller is defeated
The output going out end 620 then remains unchanged.
Although embodiments of the invention are disclosed above described, so it is not limited to the present invention, any is familiar with related art techniques
Person, without departing from the spirit and scope of the present invention, such as according to shape, structure, feature and the number described in the present patent application scope
Amount is when doing a little change, and therefore the scope of patent protection of the present invention must regard claim institute circle appended by this specification
The person of determining is as the criterion.
Claims (12)
1. a voltage conversion controller, is applied to a voltage conversion circuit, and described voltage conversion circuit operates a merit therein
Rate switchs, and an input voltage to be converted to an output voltage in an outfan, and produces a feedback signal, described feedback signal
It is coupled to a back coupling electric capacity, it is characterised in that described voltage conversion controller includes:
One feedback end stitch, is coupled to described back coupling electric capacity, and is used for receiving described feedback signal or providing count frequency news
Number；And
One power switch controls foot, in order to control the operation of power switch described in described voltage conversion circuit；
Wherein said voltage conversion controller has a first mode and one second pattern；During wherein said first mode, described
Outfan provides modulated described output voltage and gives a current loading for induced current, and described feedback end stitch receives described
Feedback signal, described feedback signal is relevant to the size of current of described output voltage or described current loading；Described second pattern
Time, described output voltage is the most modulated, and described feedback end stitch provides the described count frequency signal of fixed cycle property, described
The cycle size of count frequency signal is to be determined by the capacitance of described back coupling electric capacity.
Voltage conversion controller the most according to claim 1, it is characterised in that wherein said second pattern is a soft start
Operation or a load current excessive protection operation.
Voltage conversion controller the most according to claim 1, it is characterised in that wherein said count frequency signal is in one
Soft start operation or a load current excessive protection operation among, as calculate time span frequency, described soft to determine
The time span of the protection operation that startup operates or described load current is excessive.
Voltage conversion controller the most according to claim 1, it is characterised in that wherein said voltage conversion circuit is to speed
Return formula switch power converter.
Voltage conversion controller the most according to claim 1, it is characterised in that described voltage conversion controller further includes
One charge-discharge circuit, when described second pattern, carries out periodic discharge and recharge to described back coupling electric capacity.
Voltage conversion controller the most according to claim 5, it is characterised in that wherein said charge-discharge circuit further includes:
One first switching current assembly, is coupled to described feedback end stitch, and the sense of current is for flowing into described feedback end stitch；With
And
One second switch current components, is coupled to described feedback end stitch, and the sense of current is for flowing out described feedback end stitch.
Voltage conversion controller the most according to claim 6, it is characterised in that wherein said first switching current assembly bag
Containing a switch module, and a current source assembly or a resistor assembly, or described second switch current components comprises a switches set
Part, and a current source assembly or a resistor assembly.
Voltage conversion controller the most according to claim 6, it is characterised in that wherein further include an oscillating controller and
One enumerator；When electric pressure converter works in described second pattern, described oscillating controller utilizes and controls described first switch
Current components and the on or off of described second switch current components, carry out periodic discharge and recharge to described back coupling electric capacity,
And form the described count frequency signal of fixed cycle property, in order to the frequency source as described enumerator.
Voltage conversion controller the most according to claim 5, it is characterised in that wherein said charge-discharge circuit further includes one
Oscillating controller, described oscillating controller rises to one first comparing voltage value and decline respectively at the voltage of described back coupling electric capacity
During to second comparing voltage value, change the outputting level of described oscillating controller.
Voltage conversion controller the most according to claim 8, it is characterised in that wherein said oscillating controller comprises:
One controller input, is coupled to described feedback end stitch；
One controller output end, in order to export a signal to control described first switching current assembly and described second switch electric current
The on or off of assembly；
One first comparator, has two inputs and an outfan, and its two input is respectively coupled to the input of described controller
End and one first compares voltage；
One second comparator, has two inputs and an outfan, and its two input is respectively coupled to the input of described controller
End and one second compares voltage；And
One sets replacement latch unit, has a set input, replacement input and an outfan, a wherein said setting
Input is coupled to the outfan of described first comparator, and described replacement input is coupled to the output of described second comparator
Hold, and the described outfan setting replacement latch unit is coupled to described controller output end.
11. 1 kinds of voltage conversion circuits, it is characterised in that described voltage conversion circuit comprises:
One application circuit, and described application circuit comprises an outfan, a feedback end and is coupled to one time of described feedback end
Award electric capacity；Described outfan has an output voltage, and couples a current loading；And
One voltage conversion controller, has a feedback end stitch, is coupled to described feedback end；Wherein said voltage conversion controller
There is a first mode and one second pattern；
During wherein said first mode, described outfan provides modulated described output voltage and gives described electric current for induced current
Load, and described feedback end stitch provides a feedback signal, described feedback signal and described output voltage or described current loading
Size of current be correlated with；During described second pattern, described output voltage is the most modulated, and described feedback end stitch receives fixing week
One count frequency signal of phase property, the cycle size of described count frequency signal is to be determined by the capacitance of described back coupling electric capacity
Fixed.
12. voltage conversion circuits according to claim 11, it is characterised in that described voltage conversion circuit is one flyback
Switch power converter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101145749 | 2012-12-05 | ||
| TW101145749A TWI465015B (en) | 2012-12-05 | 2012-12-05 | Voltage converter circuit and voltage converter controller |
Publications (2)
| Publication Number | Publication Date |
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| CN103856058A CN103856058A (en) | 2014-06-11 |
| CN103856058B true CN103856058B (en) | 2017-01-11 |
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| CN201310178681.6A Expired - Fee Related CN103856058B (en) | 2012-12-05 | 2013-05-15 | Voltage conversion circuit and voltage conversion controller |
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| TW (1) | TWI465015B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9774252B2 (en) * | 2014-06-30 | 2017-09-26 | Skyworks Solutions, Inc. | Mode control device, voltage converter, and mode control method |
| TWI548186B (en) * | 2014-08-15 | 2016-09-01 | Richtek Technology Corp | Quick Start Circuit and Method of Chi - back Power Supply |
| TWI549407B (en) | 2014-09-09 | 2016-09-11 | 鴻海精密工業股份有限公司 | Multiphase power circuit |
| CN106329929B (en) * | 2015-07-03 | 2018-12-04 | 立锜科技股份有限公司 | Voltage conversion circuit and voltage conversion controller |
| TWI645657B (en) * | 2017-09-29 | 2018-12-21 | 台達電子工業股份有限公司 | Power conversion device and voltage regulating feedback circuit |
| CN109669061B (en) * | 2019-01-31 | 2021-02-23 | 广州金升阳科技有限公司 | Current sampling compensation circuit |
| US10666233B1 (en) * | 2019-02-14 | 2020-05-26 | Winbond Electronics Corp. | Power drop reset circuit for power supply chip and power drop reset signal generating method |
| TWI830355B (en) * | 2022-08-31 | 2024-01-21 | 通嘉科技股份有限公司 | Control methods for interleaved power converter |
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| TW432779B (en) * | 1999-11-03 | 2001-05-01 | Jang Wei Shiu | Small-area and low-power low-frequency oscillator |
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| KR101365753B1 (en) * | 2007-04-23 | 2014-02-21 | 페어차일드코리아반도체 주식회사 | Converter and the driving method thereof |
| TWM441272U (en) * | 2012-07-05 | 2012-11-11 | Excelliance Mos Corp | Fly-back power converting apparatus |
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| TW432779B (en) * | 1999-11-03 | 2001-05-01 | Jang Wei Shiu | Small-area and low-power low-frequency oscillator |
| CN101228685A (en) * | 2005-03-18 | 2008-07-23 | 美国快捷半导体有限公司 | Terminal for multiple functions in a power supply |
| CN101582643A (en) * | 2008-05-14 | 2009-11-18 | 富士电机电子技术株式会社 | Switching power supply |
| CN101594064A (en) * | 2009-05-31 | 2009-12-02 | 成都芯源系统有限公司 | Switching power supply controller |
| CN101599701A (en) * | 2009-07-02 | 2009-12-09 | 成都芯源系统有限公司 | Switching power supply with fault protection function and control method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201424216A (en) | 2014-06-16 |
| TWI465015B (en) | 2014-12-11 |
| CN103856058A (en) | 2014-06-11 |
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