CN104242623B - A kind of quick start method of Switching Power Supply and quick start control circuit - Google Patents
A kind of quick start method of Switching Power Supply and quick start control circuit Download PDFInfo
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- CN104242623B CN104242623B CN201410451636.8A CN201410451636A CN104242623B CN 104242623 B CN104242623 B CN 104242623B CN 201410451636 A CN201410451636 A CN 201410451636A CN 104242623 B CN104242623 B CN 104242623B
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Abstract
Circuit is controlled the invention discloses a kind of Switching Power Supply quick start method and quick start, by setting conversion voltage, when switch power source output voltage is less than conversion voltage, it is setting inductive current to control inductive current；When switch power source output voltage is higher than conversion voltage, controlling switch electric power output voltage voltage stabilizing work.A kind of scheme is to use analog circuit mode first to control inductive current to give inductive current in startup stage, after output voltage reaches conversion voltage, then controls output voltage stabilization.Another scheme is to replace analog circuit to complete same control process with MCU control circuit.The beneficial effect that Switching Power Supply quickly starts is：Digital circuit can be made to be supported on electricity and reliable reset and reliably working during Voltage Drop；Feature load equipment such as Laser Power Devices, high power DC servomotor etc. of Switching Power Supply can be made quickly to start；This influence for falling the load to Switching Power Supply can be reduced in grid voltage sags.
Description
Technical field
The invention belongs to field of switch power, open more particularly, to a kind of Switching Power Supply quick start method and quickly
Dynamic control circuit.
Background technology
Because switched power output has very big electric capacity, start-up course includes the process that output capacitance charges, voltage
Rising causes charging current bigger sooner.To prevent excessive charging current, Switching Power Supply routine Starting mode is to use
Soft starting mode.I.e. in power initiation, dutycycle is slowly increased up switch power source output voltage by zero and reaches rated voltage.
Switching device when soft Starting Technology can prevent from starting in Switching Power Supply is damaged because of excessively stream, but soft start also causes opening simultaneously
The output voltage of dynamic stage switch power supply rises slow.The soft start of usual Switching Power Supply cause the output voltage of Switching Power Supply from
Zero setup time for arriving rated voltage is a few tens of milliseconds to hundreds of milliseconds.
Traditional Switching Power Supply generally uses voltage mode (or voltage-type) pulsewidth modulation (PWM) technology, and in recent years
Current-mode (or current mode) PWM technologies are developed rapidly, comparison with voltage pattern PWM, and current mode PWM has more preferable
Voltage regulation factor and load regulation, the stability and dynamic characteristic of system are also obviously improved.
Voltage type PWM is controlled and current type PWM control belongs to simulation control, digital control with its many advantage at present
Just progressively substitution simulation control in some aspects.Digital PWM controller obtains more designs freely, can easily realize each
Plant the digital algorithm of complicated intelligence.
Application scenario below, the quick startup of Switching Power Supply has specific advantage：
(1) processing after the electrification reset and supply voltage of digital circuit fall
When the load circuit of Switching Power Supply is digital circuit (including microprocessor and its peripheral circuit), to make digital electricity
Road obtains the complete logic state in Dingan County of the stabilization of determination after the power-up, and it is usually produced by supply voltage rising edge resets letter
Number.It if supply voltage rising is excessively slow, can not know the state of circuit after electrification reset.Showing for this problem is solved at present
It is to use special reset circuit to have method, and comparison threshold value is set to supply voltage, when supply voltage exceeds threshold value, is resetted
Circuit just produces rising edge precipitous duration sufficiently long reset signal.In actual use, even if using this kind of multiple
Position circuit, can also have electrification reset and make a mistake.
Another situation is, when its supply voltage of the digital circuit of normal work falls suddenly, at this moment in digital circuit simultaneously
Being connected to the electric capacity of both ends of power can maintain a period of time to power, if supply voltage drop-out time is held time beyond this, number
Word circuit will be in unstable logic state.The existing method for solving this problem is to use special power supply monitoring circuit.The electricity
The function on road is, when Voltage Drop, to produce rising edge precipitous duration sufficiently long reset signal, reset digital circuit
To obtain the working condition completely determined.Even if using special power supply monitoring circuit, there are still power supply electricity in actual applications
Pressure is fallen, the chaotic situation of digital circuit state.
(2) when the load of Switching Power Supply is high-power function device, such as high power DC electric machine or high power laser power supply
Deng Switching Power Supply uses soft starting mode, and these function devices are accomplished by being lot more time to starting.In case of emergency, have
When need these equipment quickly to devote oneself to work.
(3) Voltage Drop can be caused when other powerful device starts on power network, such as high power DC electric machine starts and led
The Voltage Drop of cause, this fall can influence the Switching Power Supply in same supply line.After input voltage falls, in order to the greatest extent
Amount reduces influence to on-line apparatus, it is necessary to Switching Power Supply can quickly start, and quickly DC voltage is gone back up to normal value.
The content of the invention
It for the defect of prior art, can quickly start it is an object of the invention to provide one kind, can allow derailing switch again
Part does not produce the Switching Power Supply quick start method of excessively stream and quick start controls circuit.
The invention provides a kind of Switching Power Supply quick start method, comprise the steps：
(1) in electric current ascent stage, inductive current is lifted with maximum allowable dutycycle, until inductive current reaches setting electricity
Inducing current；
(2) in the constant current operation stage, inductive current is controlled by the dutycycle of controlling switch device so that the inductance
Electric current maintains the setting inductive current, until the output voltage of Switching Power Supply is conversion voltage；
(3) in voltage stabilizing working stage, the output voltage of the Switching Power Supply is caused by the dutycycle of controlling switch device
Rated voltage is maintained to realize that Switching Power Supply quickly starts.
Wherein, in step (1), the maximum allowable dutycycle is the maximum duty that Switching Power Supply main circuit can allow
Than；When the converter in the Switching Power Supply main circuit is decompression DC/DC converter, the maximum allowable dutycycle is 1；When
Converter in the Switching Power Supply main circuit is bridge-type non-isolated converter, half-bridge or during full-bridge isolated converter, it is described most
It is big to allow dutycycle to subtract dead time part for 0.5；When the converter in the Switching Power Supply main circuit becomes for single-ended reverse exciting
When parallel operation or single-ended forward converter, the maximum allowable dutycycle is 0.5.
Wherein, the setting inductive current is equal to maximum trouble free service electric current Ist(0.5-0.9) times.
Wherein, (0.85-1) times for changing voltage into rated voltage.
Quickly start control circuit present invention also offers a kind of Switching Power Supply, including comparator U1, voltage comparator U2,
Analog switch U3, current regulator U6, rest-set flip-flop U7, PWM output module U8, oscillator U9, resistance Rf, resistance RjAnd electric capacity
Cf；The first input end connection conversion voltage V of the comparator U1t, the second input connection output voltage of the comparator U1
V0；The resistance RjOne end be used for receive output voltage V0, the resistance RjThe other end be connected to the voltage comparator U2
First input end, the second input of the voltage comparator U2 is used to connect reference voltage Vf, the resistance RfWith the electricity
Hold CfIt is sequentially connected in series between the first input end of the voltage comparator U2 and the output end of the voltage comparator U2；
The first input end of the analog switch U3 is connected to the output end of the voltage comparator U2, the second of the analog switch U3
Input is used to connect setting inductive current Is；The control end of the analog switch U3 is connected to comparator U1 output end；Institute
The first input end for stating current regulator U6 is connected to analog switch U3 output end, the second input of the current regulator U6
End connection inductive current IL；The R ends of the rest-set flip-flop U7 are connected to the output end of the current regulator U6, the RS triggerings
Device U7 S ends connect the oscillator U9；The input of the PWM output modules U8 is connected to the Q ends of the rest-set flip-flop U7,
The output end of the PWM output modules U8 is used to export pwm control signal and controlling switch device break-make.
Wherein, the setting inductive current IsEqual to maximum trouble free service electric current Ist(0.5-0.9) times.
Wherein, the conversion voltage VtFor (0.85-1) times of rated voltage.
Wherein, the reference voltage VfFor the set-point needed for switch power source output voltage.
Quickly start control circuit, including MCU control module present invention also offers a kind of Switching Power Supply, be connected to described
The voltage sample module and current sample module of the input of MCU control module, and it is connected to the defeated of the MCU control module
Go out the PWM generator at end；The MCU control module include subtracter, voltage regulator, voltage comparator, switch, subtracter and
Current regulator；The first input end connection reference voltage V of the subtracterf, the second input is for receiving output voltage V0,
The output end connection voltage regulator of the subtracter, the first input end of the output end connecting valve of voltage regulator, switch
The second input be used to connect setting inductive current Is, the first input end of the output end connection subtracter of switch, subtracter
The second input be used for connect inductive current IL, the input of the output end connection current regulator of subtracter, electric current regulation
The output end of device is used for output duty cycle controlling switch device.
Wherein, the setting inductive current IsEqual to maximum trouble free service electric current Ist(0.5-0.9) times.
In the present invention, switching device electric current is set to be rapidly achieved maximum trouble free service electric current, Ran Houwei first in startup stage
Hold this electric current, it is ensured that the energy absorbed in the unit interval from input and the energy provided to output are maximum, until output voltage
Close to rated output voltage value；Can so cause switching device trouble free service not excessively stream while quickly provide energy.
Brief description of the drawings
Fig. 1 is simplification structural representation of the Switching Power Supply centered on inductance；
Fig. 2 is Switching Power Supply performance during rapid starting period analysis schematic diagram；Wherein (a) be startup stage inductance peak point current at any time
Between change schematic diagram, (b) is that startup stage output voltage changes over time schematic diagram, and (c) is startup stage dutycycle with the time
Change schematic diagram；
Fig. 3 is the theory structure block diagram for quickly starting control circuit using the electric current PWM Switching Power Supplies controlled；
Fig. 4 is the theory structure block diagram for quickly starting control circuit using the Switching Power Supply of digital PWM control；
Fig. 5 is the internal structure for quickly starting MCU control module in control circuit using the Switching Power Supply of digital PWM control
Schematic diagram；
Fig. 6 is the Switching Power Supply fast starting sequence schematic flow sheet using digital PWM control.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Switching Power Supply in the present invention, is that its input is direct current or exchange, output is direct current；Its input and output can pass through
Transformer isolation, can not also isolate.Switching device in the present invention refers to the switch triode in Switching Power Supply, typically such as
Power bipolar transistor, power MOS, IGBT etc., its turn-on and turn-off is controllable.
The present invention relates to the knowledge altogether of Switching Power Supply inductance energy storage exoergic：Switching device in Switching Power Supply is worked in out
Off status, when switch device conductive, inductive energy storage, by input power energy stores in inductance；When switching device is turned off, electricity
Feel exoergic.For single-ended reverse exciting circuit, the transformer that inductance is known as, in other converters, inductance is exactly output filter
Ripple inductance.
Several inductive currents being related in the present invention, are defined as below.Inductance ratings electric current：Refer to that Switching Power Supply works
Rated current is exported under rated power, that is, rated voltage, now in inductance electric current peak value.Maximum trouble free service electric current
Ist：When the switching device operating current in Switching Power Supply exceedes the maximum allowable operating current of device, switching device may be damaged
Bad, the maximum allowable operating current of switching device designed in engineering is known, now can obtain correspondence by experiment or calculating
Inductance current peak, that is, defined herein maximum trouble free service electric current Ist。ImIt is the limiting value of inductive current, if electric
Inducing current exceeds this value, and Switching Power Supply may be damaged.
Soft start can make switching device not excessively stream on startup, and according to conventional quick start method, switching device will
There is excessively stream dangerous.Therefore the technical problem to be solved in the present invention is：Should quickly start, that is, reduce switch power source output voltage from
The time above freezing for being raised to normal value, but otherwise allow switching device not produce excessively stream danger, i.e. switching device in maximum safety electricity
Flow down work.
Namely startup stage quickly must absorb energy from input and provide energy to output, and on the one hand these energy are given
Output voltage is quickly set up in output capacitance quick charge, on the other hand provides energy to load；Simultaneously it is noted that quickly providing energy
The precondition of amount is that switching device wants trouble free service to be unable to excessively stream.To reach that giving one in this target, the present invention sets
Determine inductive current, this setting inductor current value is between inductance ratings electric current and maximum trouble free service electric current.Starting rank
Duan Shouxian makes switching device electric current be rapidly achieved setting inductive current, then maintains this electric current, it is ensured that from defeated in the unit interval
The energy for entering the energy of absorption and being provided to output is maximum, until output voltage is close to rated output voltage value.
Such as Fig. 1, Switching Power Supply can be reduced to converter, inductance L, output capacitance C, load R.Switching device in converter
Inductive current increase, inductive energy storage during conducting；When switching device is turned off in converter, inductive current reduction, inductance is to output
Electric capacity and load exoergic.There is corresponding relation in inductive current size and switching device size of current.The maximum functional of switching device
It is maximum trouble free service electric current I that electric current, which has corresponded to inductive current,st.The present invention makes full use of inductive energy storage exoergic mistake in Switching Power Supply
Journey, solves above-mentioned technical problem.Its course of work is divided into three phases.
(1) electric current ascent stage, lifts inductive current, until inductive current reaches setting inductance with maximum allowable dutycycle
Electric current.Here maximum allowable dutycycle is the maximum duty cycle that Switching Power Supply main circuit can allow, and is become for decompression DC/DC
Parallel operation is 1, for boosting DC/DC converters 1, is 0.5 to subtract for bridge-type non-isolated converter, half-bridge or full-bridge isolated converter
Dead time part is gone to, is 0.5 for single end flyback converter, single-ended forward converter.Set inductive current and be less than inductance
Maximum trouble free service electric current Ist, preferred proportion coefficient is 0.5-0.9.The too small Switching Power Supply that can increase of this coefficient starts the time,
The danger that too conference increase switching device is damaged.This stage switch electric power output voltage is relatively low.
(2) the constant current operation stage, terminate rear inductive current on last stage and reach setting inductive current, pass through controlling switch device
The make-and-break time of part, typically dutycycle, control inductive current, and it is setting inductive current to maintain inductive current, until switch electricity
The output voltage in source is close to rated output voltage, and this voltage is referred to as changing voltage.Change voltage and be less than rated output voltage, turn
The preferred proportion for changing voltage and rated output voltage is 0.85-1.This ratio is too small to make power supply overall startup time lengthening,
It is too big to cause output voltage overshoot.Set inductor current value bigger in first stage, output voltage rises in second stage
Time it is shorter.
(3) at the end of voltage stabilizing working stage, constant-current phase, the output voltage of Switching Power Supply is conversion voltage, then switch
Power supply enters the voltage stabilizing stage, using switch power source output voltage stabilization in rated voltage as control targe, by controlling dutycycle
Switching Power Supply voltage stabilizing is set to work, this stage inductive current can decline, when accessing nominal load, last inductive current is worked in
Inductance ratings electric current.
The present invention Switching Power Supply quick start method realize one of circuit be using current type PWM control.Current mode
PWM controls include the voltage control loop as outer shroud and the current regulator as inner ring.Current regulator is used for controlling inductance
The size of electric current, when output voltage is less than conversion voltage, voltage error amplifier is stopped, and gives electric current and inductive current
As two input signals of current regulator, current regulator output produces pwm signal pulse, and it is setting to control inductive current
Inductor current value；When output voltage reaches conversion voltage, voltage error amplifier is devoted oneself to work, and voltage error amplifier is defeated
Go out two input signals as current regulator with inductive current, current regulator output produces pwm signal pulse, controlled defeated
Go out voltage for rated output voltage value.
Another implementation of the Switching Power Supply quick start method of the present invention is to use digital PWM controller.Numeral
PWM controller includes the voltage control loop as outer shroud and the electric current loop as inner ring.When output voltage is less than conversion voltage,
Running current control ring, the pulse conducting width of operation result control pwm signal, it is setting inductance electricity to control inductive current peak
Flow valuve；When output voltage, which is equal to, is more than conversion voltage, working voltage control ring and current regulator carry out double -loop control, computing
The pulse conducting width of output control pwm signal, it is rated output voltage value to control output voltage.
The method and circuit of the present invention can be such that Switching Power Supply quickly starts so that Switching Power Supply has following advantage：
(1) when electric in digital circuit, or supplying digital circuits voltage when falling suddenly, quickly makes supply voltage from above freezing
Normal value is raised to, digital circuit can be reduced and the possibility of nondeterministic statement occur.
(2) when the load of Switching Power Supply is high-power function device, the quick startup of Switching Power Supply can supply Switching Power Supply
The loading functional equipment of electricity is quickly devoted oneself to work, and for example high-voltage laser power supply, which quickly starts, laser equipment is quickly put into work
Make；The quick startup of the power supply driving power supply of high power DC servomotor can make servo-drive system quickly put into operation.
(3) Voltage Drop can be caused when other powerful device starts on power network, such as high power DC electric machine starts and led
The Voltage Drop of cause, this fall can influence the Switching Power Supply in same supply line.It is quick extensive after input voltage falls
The Switching Power Supply of work of returning to work can reduce this influence for falling the load to Switching Power Supply.
As shown in Fig. 2 (a), which is startup stage inductive current iL, changes over time schematic diagram, (b) is startup stage dutycycle
ɑ changes over time schematic diagram, and (c) is that startup stage output voltage uo changes over time schematic diagram.Complete the switch electricity of the present invention
The startup in source is divided into three phases, and its time is respectively T1, T2, T3.
T1 stages in electric current ascent stage, such as figure, this stage lifts inductive current with maximum allowable dutycycle, until
Current peak reaches setting inductive current.Inductance is smaller, and inductive current rises faster during switch device conductive.Switching device
During shut-off, output voltage is lower, and inductive current decline is fewer, and now output voltage is almost nil, the switching device shut-off phase
Between inductive current hardly decline.This stage, by big space rate, can be such that inductive current rises quickly.Inductive current rises must
There must be a limit value, inductive current is in this value, Switching Power Supply energy trouble free service, here it is setting inductance electricity in the present invention
Flow valuve.When inductive current is below setting inductor current value or setting inductor current value, the safe work of switching device is now corresponded to
Make.
Under normal loading conditions there is the specified device operation current value of one, correspondence normal loading conditions in switching device
Under there is also an inductance ratings electric current.In addition, there is a maximum working current value in the absolute rating of switching device, open
Closing device operation current may damage beyond this value, so during selected switching device, maximum operating currenbt limiting value will be stayed
Have that the maximum working current value of switching device is chosen in enough surpluses, engineer applied is the 2.5 of specified working current value to arrive
3.5 again.For inductance, that is, maximum trouble free service electric current is 2.5 to 3.5 times of inductance ratings electric current.
The maximum corresponding inductance peak current value of operating current of switching device is referred to as maximum trouble free service current value, sets
Inductive current IsValue should be less than maximum trouble free service current value, preferably set inductive current IsValue and maximum trouble free service electric current Ist
The proportionality coefficient of value is 0.5-0.9.The too small Switching Power Supply that can increase of this coefficient starts time, too conference increase switching device
The danger of damage.
The T2 stages in constant current operation stage, such as Fig. 2.This stage, by the make-and-break time of controlling switch device, is typically
Dutycycle, controls inductive current, and it is setting inductor current value to maintain inductive current peak.Constant current operation stage inductive current is maintained
It is that the technology that Switching Power Supply quickly starts ensures in setting inductor current value.Set inductor current value bigger, the constant current operation stage
Switch power source output voltage rise the time spent in it is shorter.
When output voltage is close to rated output voltage, second stage terminates；Output voltage now is referred to as changing voltage.
Conversion voltage should be less than rated output voltage, and the preferred proportion for changing voltage and rated output voltage is 0.85-1.This ratio
It is too small to make power supply overall startup time lengthening, it may cause when constant current operation step transition is to voltage stabilizing working stage greatly very much
Output voltage exceeds rated output voltage, and this does not allow in many Switching Power Supplies in engineer applied.
In the T3 stages in voltage stabilizing working stage, such as Fig. 2, output voltage has equalized to conversion at the end of the constant current operation stage
Voltage, voltage stabilizing working stage using output voltage stabilization in rated operational voltage as control targe.Into after voltage stabilizing working stage, electricity
Inducing current can decline, until Switching Power Supply steady operation.So far, Switching Power Supply start-up course terminates.
The present invention Switching Power Supply quick start method realize one of circuit be using current type PWM control circuit.Such as
Shown in Fig. 3, the quick startup control circuit of Switching Power Supply includes：Comparator U1, voltage comparator U2, analog switch U3, electric current
Adjuster U6, rest-set flip-flop U7, PWM output module U8, oscillator U9, resistance Rf, resistance RjWith electric capacity Cf；Wherein comparator U1
First input end connection conversion voltage Vt, comparator U1 the second input connection output voltage V0；Resistance RjOne end be used for
Receive output voltage V0, resistance RjThe other end be connected to voltage comparator U2 first input end, the second of voltage comparator U2
Input is used to connect reference voltage Vf, resistance RfWith electric capacity CfIt is sequentially connected in series the first input end in voltage comparator U2
Between voltage comparator U2 output end；Analog switch U3 first input end is connected to voltage comparator U2 output end,
Analog switch U3 the second input is used to connect setting inductive current Is；Analog switch U3 control end is connected to comparator U1
Output end；Current regulator U6 first input end is connected to analog switch U3 output end, the second of current regulator U6
Input connection inductive current IL；Rest-set flip-flop U7 R ends are connected to current regulator U6 output end, rest-set flip-flop U7 S
Hold connection oscillator U9；PWM output modules U8 input is connected to rest-set flip-flop U7 Q ends, PWM output modules U8 output
Hold for exporting pwm control signal controlling switch device break-make.
Wherein, U2 can be voltage error amplifier, constitute voltage regulator, and two input signal is switch electricity respectively
Source output voltage V0With reference voltage Vf.The control targe of existing Switching Power Supply be all by output voltage stabilization in reference voltage, when
When reference voltage changes, by controlling dutycycle size, switch power source output voltage also changes.General Switching Power Supply reference
Voltage has 10% an or so change, and such as experiment of special key power supply is with Switching Power Supply reference voltage from zero to specified value changes.Adopt
The institute for examining voltage required for being joined with the Switching Power Supply of the present invention to existing Switching Power Supply is functional.U6 is electric current regulation
Device, one input signal comes from analog switch U3, and another input comes from inductor current signal IL.U3 is that a simulation is opened
Close, two input signal one is the output of voltage regulator, another comes from setting inductive current Is；Analog switch U3
Its output of a conduct is selected in two input signals.U1 is a comparator, by output voltage V0With conversion voltage VtCarry out
Compare, the output control analog switch U3 of comparator.U9 is oscillator, and U7 is rest-set flip-flop, for producing pwm signal.Vibration
Device U9 output connection rest-set flip-flops U7 S ends, current regulator U6 output connection rest-set flip-flop U7 R ends.PWM width with
Current regulator U6 output voltages change and changed.U8 is PWM output modules, and it can be PWM or two all the way that it, which is exported,
The complementary PWM outputs in road.
As a whole, current type PWM control includes the voltage control loop as outer shroud and the current control as inner ring
Ring.Current regulator is used for controlling the size of inductive current, when output voltage is less than conversion voltage VtWhen, comparator U1 by than
Signal is switched to setting inductive current I by relatively control analog switch U3s, now voltage regulator on output duty cycle without influence,
Current regulator will adjust dutycycle.If inductive current ILLess than set point inductive current Is, dutycycle is then maximum duty cycle,
Here it is electric current ascent stage；As inductive current ILReach setting inductive current IsWhen, current regulator makes inductive current ILIt is constant
In setting inductive current Is.Now voltage error amplifier is stopped.
When output voltage reaches conversion voltage VtWhen, comparator U1 is switched to signal by comparing control analog switch U3
Voltage regulator is exported, and now voltage error amplifier U2 devotes oneself to work, and voltage error amplifier output and inductive current are made
For current regulator U6 two input signals, the pulse for producing pwm signal by the output control trigger of current comparator is led
Logical width, controls dutycycle to make output voltage be rated output voltage value.
Another implementation of the Switching Power Supply quick start method of the present invention is to use digital PWM controller, and it is former
Reason signal is as shown in Figure 4.Using this scheme, the quick startup control circuit of Switching Power Supply includes：Voltage sample module 3, electricity
Flow sampling module 4, MCU control module 5 and PWM generator 6；The output voltage respectively to Switching Power Supply of MCU control module 5,
Inductive current is sampled, and passes through computing output pwm signal, controlling switch device break-make.The voltage sample module 3 and electric current
The sample rate of sampling module 4 controls frequency more than four times higher than PWM, to ensure that both can obtain some row instantaneous values at sampling,
MCU control module can obtain peak value or average value from these instantaneous values.
As shown in figure 5, MCU control module 5 includes：Subtracter 50, voltage regulator 51, voltage comparator 52, switch 53,
Subtracter 55 and current regulator 54, the first input end connection reference voltage V of subtracter 50f, the second input is for receiving
Output voltage V0, the output end connection voltage regulator 51 of subtracter 50, the output end connecting valve 53 of voltage regulator 51
First input end, the second input of switch 53 is setting inductive current Is, the first of the output connection subtracter 55 of switch 53
Input, the second input of subtracter 55 is inductive current IL, the output of subtracter 55 is current regulator 54, electric current regulation
The output duty cycle controlling switch device of device 54.Output voltage V0Connect the first input end of comparator 52, conversion voltage VtConnection ratio
Compared with the second input of device, the control end of the output connecting valve 53 of comparator, the output end of the control section energy controlling switch 53
Connected with first input end or the second input.
Voltage regulator 51 is by reference voltage VfWith output voltage V0Difference carry out computing, operation result is sent to software switch
53, another input of software switch 53 is setting inductive current Is；Voltage comparator 52 is by output voltage V0With conversion voltage
VtIt is compared, its output control switch 53.Switch 53 can be the software switch of alternative, as output voltage V0Less than conversion
Voltage VtWhen namely Switching Power Supply is in startup stage, switch 53 gates Is, when output voltage is higher than VstNamely switch electricity
At the end of source starts, software switch selects the output of voltage regulator.53 output and inductive current I will be switchedLDifference progress
Computing, its output control PWM generator, the controllable pwm signal of output duty cycle.PWM generator, its output can be all the way
PWM or the complementary PWM outputs of two-way.
Digital PWM controller program bag contains voltage regulator, current regulator.Program circuit schematic diagram is as shown in Figure 6.When
When output voltage is less than conversion voltage, set-point is setting inductive current Is, then carry out electric current regulation computing, running current control
Ring processed, the pulse conducting width of operation result control pwm signal, it is setting electric current value to control inductive current peak；When output electricity
When pressure is equal to more than conversion voltage, output voltage is subjected to voltage-regulation computing, working voltage control ring and current regulator enter
Row double -loop control, the pulse conducting width of operation result control pwm signal, it is rated output voltage value to control output voltage.
In embodiment more than in the present invention, the sampled point of electric current is using inductive current as embodiment, in fact
There can also be other sampled points in the application of border, other sampled points be carried out with current sample with carrying out electric current use to inductance, it is obtained
To current value it is only proportional on change, to the quick Starting mode of the Switching Power Supply in the present invention and two kinds of Switching Power Supplies
The quick implementation that starts does not have other influences.For specific switching power converters, its current sample point is described as follows：
For decompression DC/DC converters, its current sample point can be switching device electric current or inductive current or they
With reference to；
For boosting DC/DC converters, its current sample point can be switching device electric current or inductive current or they
With reference to；
For bridge-type non-isolated converter, its current sample point can be inductive current；
For single end flyback converter, its current sample point can be switching device electric current or primary side current of transformer or it
Combination；
For single-ended forward converter, its current sample point can be switching device electric current or primary side current of transformer or change
Depressor secondary side or inductive current or their combination；
For half-bridge or full-bridge isolated converter, its current sample point can be primary side current of transformer or transformer secondary side
Electric current or inductive current or their combination.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (9)
1. a kind of Switching Power Supply quickly starts control circuit, it is characterised in that including comparator U1, voltage comparator U2, simulation
Switch U3, current regulator U6, rest-set flip-flop U7, PWM output module U8, oscillator U9, resistance Rf, resistance RjWith electric capacity Cf；
The first input end connection conversion voltage V of the comparator U1t, the second input connecting valve electricity of the comparator U1
The output voltage V in source0；The resistance RjOne end be used to receive the output voltage V of Switching Power Supply0, the resistance RjThe other end
The first input end of the voltage comparator U2 is connected to, the second input of the voltage comparator U2 is used to connect with reference to electricity
Press Vf, the resistance RfWith the electric capacity CfIt is sequentially connected in series the first input end and the electricity in the voltage comparator U2
Between the output end for pressing comparator U2；The first input end of the analog switch U3 is connected to the output of the voltage comparator U2
End, the second input of the analog switch U3 is used to connect setting inductive current Is；The control end of the analog switch U3 connects
It is connected to comparator U1 output end；The first input end of the current regulator U6 is connected to analog switch U3 output end, institute
State current regulator U6 the second input connection inductive current IL；The R ends of the rest-set flip-flop U7 are connected to the electric current and adjusted
Device U6 output end is saved, the S ends of the rest-set flip-flop U7 connect the oscillator U9；The input of the PWM output modules U8
The Q ends of the rest-set flip-flop U7 are connected to, the output end of the PWM output modules U8 is used to export pwm control signal and control
Switching device break-make.
2. Switching Power Supply as claimed in claim 1 quickly starts control circuit, it is characterised in that the setting inductive current Is
Equal to maximum trouble free service electric current Ist0.5 times -0.9 times.
3. Switching Power Supply as claimed in claim 1 or 2 quickly starts control circuit, it is characterised in that the conversion voltage VtFor
0.85 times -1 times of rated voltage.
4. a kind of Switching Power Supply based on described in claim 1 quickly starts the Switching Power Supply quick start method of control circuit,
It is characterised in that it includes following step：
(1) in electric current ascent stage, with maximum allowable dutycycle lifting inductive current IL, until inductive current ILReach setting electricity
Inducing current Is；
(2) in the constant current operation stage, inductive current I is controlled by the dutycycle of controlling switch deviceLSo that the inductive current
ILMaintain the setting inductive current Is, until the output voltage V of Switching Power Supply0For conversion voltage Vt；
(3) in voltage stabilizing working stage, the output voltage V of the Switching Power Supply is caused by the dutycycle of controlling switch device0Maintain
In rated voltage so as to realize that Switching Power Supply quickly starts.
5. Switching Power Supply quick start method as claimed in claim 4, it is characterised in that described maximum allowable in step (1)
Dutycycle is the maximum duty cycle that Switching Power Supply main circuit can allow；When the converter in the Switching Power Supply main circuit is drop
When pressing DC/DC converters, the maximum allowable dutycycle is 1；When the converter in the Switching Power Supply main circuit is that bridge-type is non-
When isolated converter, half-bridge or full-bridge isolated converter, the maximum allowable dutycycle subtracts dead time part for 0.5；When
It is described maximum allowable to account for when converter in the Switching Power Supply main circuit is single end flyback converter or single-ended forward converter
Sky is than being 0.5.
6. Switching Power Supply quick start method as claimed in claim 4, it is characterised in that the setting inductive current IsIt is equal to
Maximum trouble free service electric current Ist0.5 times -0.9 times.
7. Switching Power Supply quick start method as claimed in claim 4, it is characterised in that the conversion voltage VtFor specified electricity
0.85 times -1 times of pressure.
8. a kind of Switching Power Supply quickly starts control circuit, it is characterised in that including MCU control module (5), it is connected to described
The voltage sample module (3) and current sample module (4) of the input of MCU control module (5), and it is connected to the MCU controls
The PWM generator (6) of the output end of molding block (5)；
The MCU control module (5) includes the first subtracter (50), voltage regulator (51), voltage comparator (52), switch
(53), the second subtracter (55) and current regulator (54)；
The first input end connection reference voltage V of first subtracter (50)f, the second input is for receiving output voltage V0,
The output end connection voltage regulator (51) of first subtracter (50), the output end connecting valve of voltage regulator (51)
(53) first input end, the second input of switch (53) is used to connect setting inductive current Is, switch the output end of (53)
The first input end of the second subtracter (55) is connected, the second input of the second subtracter (55) is used to connect inductive current IL,
The input of the output end connection current regulator (54) of second subtracter (55), the output end of current regulator (54) is for defeated
Go out Duty ratio control switching device；The output voltage V of Switching Power Supply0The first input end of the voltage comparator (52) is connected,
Change voltage VtThe second input of the voltage comparator (52) is connected, the output connection of the voltage comparator (52) is described
The control end of (53) is switched, the control end can control the output end and the first input end of the switch (53) of the switch (53)
Or second input connection.
9. Switching Power Supply as claimed in claim 8 quickly starts control circuit, it is characterised in that the setting inductive current Is
Equal to maximum trouble free service electric current Ist0.5 times -0.9 times.
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| US9584012B2 (en) | 2015-02-14 | 2017-02-28 | Skyworks Solutions, Inc. | Quick-start high-voltage boost |
| CN104767372B (en) * | 2015-04-24 | 2017-12-19 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and apply its inverse excitation type converter |
| CN106452042B (en) * | 2016-11-18 | 2019-02-05 | 南京航空航天大学 | Suitable for analog control system downconverter SS (soft start) control circuit and control method |
| US11476806B2 (en) | 2019-10-03 | 2022-10-18 | Skyworks Solutions, Inc. | Jump-start power amplifier boost converter |
| CN111585421B (en) * | 2020-05-28 | 2023-08-04 | 陕西工业职业技术学院 | Light switching power supply with variable voltage output and low switching loss |
| CN112098978B (en) * | 2020-09-14 | 2024-03-26 | 哈工大机器人（合肥）国际创新研究院 | System and method for improving turn-on speed of TOF camera laser and reducing driving power consumption |
| CN115549461A (en) * | 2022-09-30 | 2022-12-30 | 圣邦微电子(苏州)有限责任公司 | DC-DC converter and control method thereof |
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| US7990123B2 (en) * | 2008-03-28 | 2011-08-02 | Panasonic Corporation | DCDC converter with soft-startup and soft-transition for adjustable output voltage |
| CN101969218A (en) * | 2010-10-29 | 2011-02-09 | 重庆长安汽车股份有限公司 | Intelligent charging method for pure electric automobile |
| US9379643B2 (en) * | 2010-12-23 | 2016-06-28 | The Regents Of The University Of Colorado, A Body Corporate | Electrosurgical generator controller for regulation of electrosurgical generator output power |
| JP5772020B2 (en) * | 2011-02-03 | 2015-09-02 | 株式会社デンソー | Switching control device |
| US9667240B2 (en) * | 2011-12-02 | 2017-05-30 | Cypress Semiconductor Corporation | Systems and methods for starting up analog circuits |
| CN203014666U (en) * | 2012-12-28 | 2013-06-19 | 杭州士兰微电子股份有限公司 | Quick start gate driving device and control module thereof |
| CN203086362U (en) * | 2013-01-25 | 2013-07-24 | 杭州士兰微电子股份有限公司 | Switching power supply and controller thereof |
| CN104022641B (en) * | 2014-06-05 | 2016-09-07 | 辉芒微电子（深圳）有限公司 | Anti-cross punching and the fast charge pump circuit started and anti-cross punching start method soon |
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