CN102694459A - Startup control circuit possessing acceleration startup function and operation method thereof - Google Patents

Startup control circuit possessing acceleration startup function and operation method thereof Download PDF

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Publication number
CN102694459A
CN102694459A CN2011100733174A CN201110073317A CN102694459A CN 102694459 A CN102694459 A CN 102694459A CN 2011100733174 A CN2011100733174 A CN 2011100733174A CN 201110073317 A CN201110073317 A CN 201110073317A CN 102694459 A CN102694459 A CN 102694459A
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China
Prior art keywords
power supply
supply unit
power
control circuit
voltage
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CN2011100733174A
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Chinese (zh)
Inventor
曾任辉
李清澔
李建和
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Neoenergy Microelectronics Inc
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Neoenergy Microelectronics Inc
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Priority to CN2011100733174A priority Critical patent/CN102694459A/en
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Abstract

A startup control circuit possessing an acceleration startup function and an operation method thereof are applied in a power supply. A primary side winding is coupled with a transformer through a power switch so as to switch and control the transformer, and then an output voltage of the power supply is adjusted. The startup control circuit comprises a capacitor and a startup control apparatus. The startup control apparatus comprises an enabling switch unit and a power supply control unit. Through controlling conduction and cut-off of the enabling switch unit of the startup control apparatus, the control of the acceleration startup of the power supply can be provided and power supply stability of the power supply can be ensured.

Description

Have start-up control circuit and the method for operation thereof of quickening to start function
Technical field
The present invention relates to a kind of start-up control circuit and method of operation thereof, relate in particular to a kind of start-up control circuit and method of operation thereof of quickening to start function that have that is applied to power supply unit.
Background technology
The pulse wave width modulation technology is an existing technology, is to be used for controlling and the stable power output of adjusting power supply unit.Power supply unit must provide various defencive functions, like overvoltage, overcurrent and overpower protection, is used for protecting power supply unit and peripheral circuit, to avoid causing nonvolatil injury.
U.S. Pat 6,587,357 disclose a kind of power source starting apparatus that is used for switched power supply.Seeing also Figure 1A and Figure 1B and be respectively the existing circuit block diagram and the output waveform figure of this power-supply controller of electric internal circuit with power supply changeover device of a power-supply controller of electric, is Fig. 1 and the Fig. 2 that distinguishes corresponding U.S. Pat 6,587,357.This switched power supply comprises primary side circuit 20, secondary side circuit 30 and a power-supply controller of electric 40.This power-supply controller of electric 40 mainly comprises a controllable power 42, a comparator 44, an electric capacity 46, a controller 48, a power switch 52 and a reference voltage 56.This controller 48 receives the responsibility cycle (duty cycle) of a feedback signal to control this power switch 52 that is transmitted by a feedback circuit 38, and then control flows is through the electric current of the first side winding of this primary side circuit 20.In addition, this reference voltage 56 provide with the voltage ratio in an operating voltage loop 54, and determine the output of this comparator 44.
The action of this switched power supply is described below: when this power supply unit power supply unit starts; These electric capacity 46 not energy storage; Because this electric capacity 46 connects these operating voltage loops 54, therefore, the voltage in this operating voltage loop 54 then with this electric capacity 46 on the cross-pressure size identical; So the voltage in this operating voltage loop 54 is zero.At this moment, these comparator 44 output high potential signals make this controllable power 42 electrically connect this electric capacity 46.Therefore, the starting current of system is flowed through this controllable power 42 with to these electric capacity 46 chargings, makes the voltage in this operating voltage loop 54 increase gradually.
When the voltage in this operating voltage loop 54 increases and when reaching this second voltage level, these comparator 44 output low-potential signals make this controllable power 42 break off the electric connection with this electric capacity 46.At this moment, 46 discharges of this electric capacity are to provide these power-supply controller of electric 40 internal circuit energy needed (or provided by another auxiliary winding terminal), and therefore, the voltage in this operating voltage loop 54 reduces gradually.When the voltage in this operating voltage loop 54 reduces and when reaching this first voltage level, this comparator 44 is exported high potential signal again, makes this controllable power 42 electrically connect this electric capacity 46 again.As aforementioned, at this moment, this controllable power 42 provides electric current and again to these electric capacity 46 chargings, makes the voltage in this operating voltage loop 54 increase gradually.Under normal operation, the operation that cycle repeats is above-mentioned is stopped power supply and is shut down up to this switched power supply.
In addition, U.S. Pat 6,480,402 disclose a kind of start-up circuit of power supply unit.See also Fig. 2 A and Fig. 2 B and be respectively existing circuit block diagram and the output waveform figure of this start-up circuit internal circuit, Fig. 4 and Fig. 5 of corresponding U.S. Pat 6,480,402 respectively with power supply changeover device of a start-up circuit.
This power supply unit mainly comprises a start-up circuit (starup circuit) 40, one long-pending body control circuit (integrated control circuit) CIC and a transformer (not shown).And a secondary side S of this transformer exports an alternating voltage, and through after a diode D rectification and the capacitor C s filtering, this long-pending body control circuit CIC is provided required power supply.This start-up circuit 40 comprises an input IN and an output OUT.This input IN connects a feeder line La; This output OUT connects a feed side (feeding terminal) Vcc and this capacitor C s of this long-pending body control circuit CIC.
This start-up circuit 40 also comprises one first current generator 41, one second current generator 42.This first current generator 41 provides a current value I, and this second current generator 42 provides K times of current value of this current value I, is the electric current of K * I, and wherein, the K value is more than or equal to 1, usually between 5~10.And this second current generator 42 electrically connects a control switch 44.This start-up circuit 40 also comprises an operational amplifier 43, and a non-inverting input of this operational amplifier 43 is to be imported by a direct current bias voltage V3.Wherein, this Dc bias V3 is set at a cut-ff voltage Voff less than this long-pending body control circuit CIC (being the minimum of this long-pending body control circuit CIC, the Voff that is indicated like Fig. 2 B).
Wherein embodiment with this patent illustrates.The output of this operational amplifier 43 is these control switchs 44 of control.When the voltage of this output OUT during less than this Dc bias V3, then this control switch 44 is conducting state (turned on); And when the voltage of this output OUT during more than or equal to this Dc bias V3, then this control switch 44 is cut-off state (turned off).
This start-up circuit 40 comprises a first control circuit 53 in order to control a control switch 51.This first control circuit 53 comprises an operational amplifier 46, and a non-inverting input of this operational amplifier 46 is imported by a direct current bias voltage V2, and an inverting input then connects the one activation/forbidden energy end DIS of this start-up circuit 40.
The output of this operational amplifier 46 is these control switchs 51 of control.When the voltage of this activation/forbidden energy end DIS during less than this Dc bias V2, then this control switch 51 is conducting state (turned on); And when the voltage of this activation/forbidden energy end DIS during greater than this Dc bias V2, then this control switch 51 is cut-off state (turned off).
Cooperation is referring to Fig. 2 B, and (from top to bottom) as shown in the figure has the output current Iout of this start-up circuit 40, the terminal voltage Vcc of this capacitor C s, the terminal voltage Vref of this activation/forbidden energy end DIS.The action of this switched power supply is described below: when this switched power supply is opened; This control switch 44 is conducting state (turned on) with this control switch 51; At this moment, flow through this output current Iout size of this output OUT is (K+1) * I.And this output current Iout is to this capacitor C s charging, at this moment; When the terminal voltage Vcc of this capacitor C s arrived this Dc bias V3, this control switch 44 was controlled as cut-off state (turned off), and; This output current Iout size of this output OUT of flowing through is I; And to this capacitor C s charging, therefore, the charging voltage curve that the output current Iout of then more aforementioned (the K+1) * I of charging voltage curve of this capacitor C s is produced comes gentlyer.Afterwards, when the terminal voltage Vcc of this capacitor C s arrived the starting resistor Von of this long-pending body control circuit CIC, this long-pending body control circuit CIC then began action.At this moment, the terminal voltage Vref of this activation/forbidden energy end DIS then bounces up and is high potential, and therefore, this control switch 51 is controlled as cut-off state (turned off), makes that this output current Iout of this output OUT is zero.Moreover, if when the terminal voltage Vcc of this capacitor C s is reduced to a minimum Voff, should long-pending body control circuit CIC be closed condition then, and the terminal voltage Vref of this activation/forbidden energy end DIS then drop to electronegative potential.Afterwards, this control switch 51 is controlled as conducting state, makes this start-up circuit 40 be activated once more; But because the terminal voltage Vcc of this capacitor C s is greater than this Dc bias V3, therefore, this control switch 44 still is a cut-off state; And this output current Iout of this output OUT that flows through size is I; And once more to this capacitor C s charging, so the terminal voltage Vcc of this capacitor C s also increases gradually again.Under normal operation, the operation that cycle repeats is above-mentioned is stopped power supply and is shut down up to this switched power supply.
This kind method can be through increasing current source, so that system boot speeds up.Yet, in actual application,, will cause area that the starting current source need expend bigger integrated circuit and become realization originally because current source is strengthened (K+1) mode doubly shorten the available machine time through utilizing.
In addition, U.S. Pat 7,525,819 disclose a kind of switched power supply.See also circuit block diagram and this switched power supply bias voltage and the switching current oscillogram under the bias voltage, Fig. 1 and Fig. 3 of corresponding U.S. Pat 7,525,819 respectively when starting that Fig. 3 A and Fig. 3 B are respectively existing switch type power converter.
This switched power supply comprises a power suppling part 100, an efferent 200, a feedback section 300, a switch controller 400 and an auxiliary winding supply department 500.Wherein, this auxiliary winding supply department 500 comprises auxiliary winding L 3, a diode D2, a capacitor C 2 of a transformer.
This switch controller 400 comprises a PWM controller 420, one an initial bias voltage feeding unit 440 and a main switch Qsw.Wherein, Should auxiliary winding L 3 pass through this start bias feeding unit 440 when start-up operation with this diode D2; Supply a bias voltage Vcc and give this capacitor C 2, also or through this PWM controller 420 see control signal off to close 2 power supplies of 440 pairs of these capacitor C of this start bias feeding unit.
This PWM controller 420 is accepted this a bias voltage Vcc and a feedback voltage Vfb.Cooperation is referring to Fig. 3 B, when this switched power supply is opened, and not conducting of this main switch Qsw, at this moment, this capacitor C 2 makes this bias voltage Vcc rise gradually through 440 chargings of this start bias feeding unit.Afterwards, as this bias voltage Vcc during greater than a reference voltage Vref, this PWM controller 420 outputs one signal is to switch this main switch Qsw, and therefore, this grid bias power supply supply department 500 also begins operation thereupon, and the voltage of this capacitor C 2 is also set up.Then; A Preset Time (being called Tdelay time of delay) after opening this main switch Qsw; This PWM controller 420 outputs one signal is to close this start bias feeding unit 440; At this moment, 2 of this capacitor C are passed through and should auxiliary winding supply department 500 be charged, so that this PWM controller 420 energy needed to be provided.Under normal operation, the operation that cycle repeats is above-mentioned is stopped power supply and is shut down up to this switched power supply.
The boost voltage of conventional start-up circuit system can't provide enough power supply capacities usually when beginning, so system boot and shutdown need between a voltage buffering area, give this PWM controller 420 through supply voltage electric capacity of voltage regulation and the common power supply of boost voltage.Yet this technology except above-mentioned two power supply sources, adds the starting current source again and supplies power together when start, thereby can reduce between system boot and shutdown needs one voltage buffering area.Therefore, through this kind mode, second voltage level that this reference voltage Vref can design than aforesaid U.S. Patent US 6,480,402 is low, thereby can shift to an earlier date start-up system.Relatively, under this designing technique, has disadvantage: 1, when starting current expends electric current greater than control chip is required, can make that supply voltage constantly promotes, finally can burn control chip or cause control chip to get into overvoltage protection; 2, when real the work; Owing to reduced between the voltage buffering area; And time of delay, circuit was fixing preset time of delay (predetermined delay time), when Different products is used, might cause time of delay after; Boost voltage and supply voltage electric capacity of voltage regulation still are not enough to supply control chip, cause supply voltage to cross low thereby shutdown system.
Prior art
20 primary side circuit
30 secondary side circuit
38 feedback circuits
40 power-supply controller of electric
42 controllable power
44 comparators
46 electric capacity
48 controllers
52 power switches
54 operating voltage loops
56 reference voltages
40 start-up circuits
41 first current generators
42 second current generators
43 operational amplifiers
44 control switchs
46 operational amplifiers
51 control switchs
53 first control circuits
CIC amasss the body control circuit
The secondary side of S transformer
The D diode
Cs electric capacity
The IN input
The OUT output
The La feeder line
Vcc feed side voltage
The Von starting resistor
The Voff cut-ff voltage
Vref activation/forbidden energy terminal voltage
The V2 Dc bias
The V3 Dc bias
The I current value
The Iout output current
DIS activation/forbidden energy end
100 power suppling parts
200 efferents
300 feedback section
400 switch controllers
420 PWM controllers
440 start bias feeding units
500 auxiliary winding supply departments
The auxiliary winding of L3 transformer
The D2 diode
C2 electric capacity
The Qsw main switch
The Vcc bias voltage
The Vfb feedback voltage
Tdelay time of delay
The present invention
The Qs power switch
Ca electric capacity
The Tr transformer
The Wpr first side winding
The Wse secondary side winding
Wau assists winding
10 start-up control devices
102 power control units
104 activation switch elements
The Vfb feedback signal
The Vcs current sensing signal
Vss delays enabling signal
The Vcc operating voltage
Vup upper limit critical voltage
Vlow lower limit critical voltage
The Von conducting voltage
The Vg control signal
The Ven enable signal
The Da diode
Rs detects resistance
The Op optical coupler
T0 start-up time
The t1 very first time
Second time of t2
The 3rd time of t3
The 4th time of t4
The 5th time of t5
The 6th time of t6
The 7th time of t7
The 8th time of t8
The 9th time of t9
S100~S302 step
Summary of the invention
In order to address the above problem; The object of the present invention is to provide a kind of start-up control circuit and method of operation thereof of quickening to start function that have that is applied to power supply unit; The conducting of the activation switch element through controlling a start-up control device with end; With the control that provides this power supply unit to quicken startup, and guarantee that the power supply of this power supply unit is stable.
To achieve these goals; The present invention provides a kind of start-up control circuit that quickens to start function that has, and is applied in the power supply unit, is coupled to the first side winding of transformer through power switch; With the switching controls transformer, and then the output voltage of adjustment power supply unit.The start-up control circuit comprises electric capacity and start-up control device.
Electric capacity provides operating voltage.The start-up control device electrically connects electric capacity and power switch.The start-up control device comprises activation switch element and power control unit.The activation switch element electrically connects the first side winding and the electric capacity of transformer.Power control unit electrically connects the activation switch element, and receives operating voltage, with the conducting of control activation switch element with end.
Wherein, after power supply unit started, when power supply unit got into upper limit critical voltage mode of operation, the enable signal of power control unit output electronegative potential with by the activation switch element, no longer continued to increase operating voltage; When power supply unit got into lower limit critical voltage mode of operation, the enable signal of power control unit output high potential with conducting activation switch element, made no longer continuous decrease of operating voltage; In addition, when power supply unit got into steady state operation, the enable signal of power control unit output electronegative potential was to end the activation switch element.
To achieve these goals; The present invention also provides a kind of start-up control circuit operation method of quickening to start function that has, and is applied in the power supply unit, is coupled to the first side winding of transformer through power switch; With the switching controls transformer, and then the output voltage of adjustment power supply unit.The method of operation of start-up control circuit comprises the following step: at first, judge whether power supply unit gets into the start mode of operation; Then, if power supply unit gets into the start mode of operation, then export control signal with the power controlling switch; Then, judge whether power supply unit gets into the abnormal voltage mode of operation; Then, if the non-entering abnormal voltage of power supply unit mode of operation judges then whether power supply unit gets into steady state operation; At last,, then export the enable signal of electronegative potential, to end the activation switch element if power supply unit gets into steady state operation.
Effect of the present invention is, the conducting of this activation switch element through controlling this start-up control device with end, quicken the control that starts so that this power supply unit to be provided; The conducting of this activation switch element through controlling this start-up control device with end, to guarantee the power supply stability of this power supply unit.
Accompanying drawing describes the present invention below in conjunction with accompanying drawing and specific embodiment, but not as to qualification of the present invention.
Description of drawings
Figure 1A is existing circuit block diagram with power supply changeover device of a power-supply controller of electric;
Figure 1B is the output waveform figure of existing this power-supply controller of electric internal circuit;
Fig. 2 A is existing circuit block diagram with power supply changeover device of a start-up circuit;
Fig. 2 B is the output waveform figure of existing this start-up circuit internal circuit;
Fig. 3 A is the circuit block diagram of existing switch type power converter;
Fig. 3 B is bias voltage and switching current oscillogram bias voltage under of existing this switched power supply when starting;
The start-up control circuit application that Fig. 4 A quickens to start function for the present invention has is in the circuit block diagram of the most preferred embodiment of a power supply unit;
Fig. 4 B is the output waveform figure of this start-up control inside circuit circuit of the present invention;
Fig. 4 C is the part output waveform figure of this start-up control inside circuit circuit of the present invention; And
Fig. 4 D quickens the flow chart of the start-up control circuit operation method of startup function for the present invention has.
Wherein, Reference numeral
Embodiment
Now relevant technology contents of the present invention and detailed description, conjunction with figs. is explained as follows:
See also start-up control circuit application that Fig. 4 A quicken to start function for the present invention has in the circuit block diagram of the most preferred embodiment of a power supply unit.This has the start-up control circuit that quicken to start function, is applied in the power supply unit, is coupled to the first side winding Wpr of a transformer Tr through a power switch Qs, with this transformer of switching controls Tr, and then adjusts the output voltage of this power supply unit.Wherein, this transformer Tr also comprises a secondary side winding Wse and an auxiliary winding Wau.
This start-up control circuit comprises a capacitor C a and a start-up control device 10.This capacitor C a should couple by auxiliary winding Wau through a diode Da and this transformer Tr's, so that an operating voltage Vcc to be provided.This start-up control device 10 electrically connects this first side winding Wpr, this capacitor C a and this power switch Qs of this transformer Tr.
This start-up control device 10 comprises an activation switch element 104 and a power control unit 102.This activation switch element 104 electrically connects this first side winding Wpr and this capacitor C a of this transformer Tr.This power control unit 102 electrically connects these activation switch elements 104, and receives this operating voltage Vcc, with the conducting of controlling this activation switch element 104 with end.Wherein, This start-up control device 10 inner lower limit critical voltage Vlow, a upper limit critical voltage Vup, a conducting voltage Von and slow enabling signal Vss of producing, with conducting that these power control unit 102 these activation switch elements 104 of control are provided with end.
This start-up control circuit also comprises an optical coupler Op and and detects resistance R s.This optical coupler Op electrically connects this power control unit 102 of this start-up control device 10, and produces a feedback signal Vfb, with conducting that these power control unit 102 these activation switch elements 104 of control are provided with end.This detects this power switch of resistance R s series connection Qs, and produces a current sensing signal Vcs, with conducting that these power control unit 102 these activation switch elements 104 of control are provided with end.
The detail operations explanation that this has the start-up control circuit that quickens the startup function please cooperate the output waveform figure for this start-up control inside circuit circuit of the present invention referring to Fig. 4 B.Fig. 4 B from top to bottom representes this operating voltage Vcc, this control signal Vg, this enable signal Ven and the oscillogram that should delay enabling signal Vss and this feedback signal Vfb respectively.In start-up time during t0, after this power supply unit started, this power control unit 102 can these activation switch elements 104 of conducting; At this moment, when these activation switch element 104 conductings, it acts on as a constant current source is provided; And then to this capacitor C a charging, so that this operating voltage Vcc to be provided.When this power supply unit gets into should start mode of operation the time, these power control unit 102 outputs one control signal Vg to be controlling this power switch Qs, and then switches this transformer Tr.That is, when a very first time t1, when this operating voltage Vcc is recharged greater than this conducting voltage Von, represent that then this power supply unit gets into this start mode of operation.At this moment, this power control unit 102 outputs one control signal Vg to be controlling this power switch Qs, and then switches this transformer Tr, and system begins to start.Yet; This moment, system was unstable as yet, when this power supply unit gets into this upper limit critical voltage mode of operation, and the enable signal Ven of this power control unit 102 outputs one electronegative potential; With by this activation switch element 104, this operating voltage Vcc is no longer continued to increase.That is, when one second time t2,, represent that then this power supply unit gets into this upper limit critical voltage mode of operation as this operating voltage Vcc during greater than this upper limit critical voltage Vup.So, constantly rise, cause, make this operating voltage Vcc no longer continue to raise by this activation switch element 104 for fear of supply voltage.Therefore; When this operating voltage Vcc surpasses this upper limit critical voltage Vup; The enable signal Ven of these power control unit 102 these electronegative potentials of output; To end this activation switch element 104, at this moment, this moment, this start-up control device 10 being supplied power through should assist winding Wau end and this capacitor C a of this transformer Tr jointly.Noticeable; This upper limit critical voltage Vup be not as this start-up control device 10 when abnormal overvoltage takes place; Close the basis for estimation of this start-up control device 10; But when this operating voltage Vcc surpasses this upper limit critical voltage Vup,, this operating voltage Vcc is no longer continued to increase through by this activation switch element 104.
At this moment, when this activation switch element 104 is ended, this capacitor C a no longer is recharged, and causes this operating voltage Vcc to descend gradually.Afterwards, when power supply unit got into this lower limit critical voltage mode of operation, the enable signal of this power control unit 102 outputs one high potential was with this activation switch element 104 of conducting.That is; When one the 3rd time t3; As this operating voltage Vcc during, represent that then this power supply unit gets into this lower limit critical voltage mode of operation, at this moment less than this lower limit critical voltage Vlow; This capacitor C a is recharged once again, and cause this operating voltage Vcc no longer continuous decrease rise gradually because of charging on the contrary.Afterwards, when one the 4th time t4, as aforesaid should very first time t1, as this operating voltage Vcc during, represent that then this power supply unit gets into this start mode of operation once again once more greater than this conducting voltage Von.Afterwards; When one the 5th time t5,, because being recharged once again, this electric capacity increases gradually as this operating voltage Vcc as aforesaid this second time t2; And during once more greater than this upper limit critical voltage Vup, represent that then this power supply unit gets into this upper limit critical voltage mode of operation once again.At this moment, this activation switch element 104 is ended, and this capacitor C a no longer is recharged, and causes this operating voltage Vcc to descend gradually once again.Afterwards, when one the 6th time t6,,, represent that then this power supply unit gets into this lower limit critical voltage mode of operation once again as this operating voltage Vcc during less than this lower limit critical voltage Vlow as aforesaid the 3rd time t3.At this moment, this capacitor C a is recharged once again, and cause this operating voltage Vcc no longer continuous decrease rise gradually because of charging on the contrary.Afterwards, at one the 7th time t7, as aforesaid should very first time t1 (or the 4th time t4), as this operating voltage Vcc during, represent that then this power supply unit gets into this start mode of operation once again once more greater than this conducting voltage Von.
This operating voltage Vcc is during again greater than this upper limit critical voltage Vup or this operating voltage Vcc during not again less than this lower limit critical voltage Vlow, when representing that then this power supply unit is in normal start-up operation.Please cooperate the part output waveform figure for this start-up control inside circuit circuit of the present invention referring to Fig. 4 C.Fig. 4 C from top to bottom representes the oscillogram of this slow enabling signal Vss, this feedback signal Vfb and this current sensing signal Vcs and this enable signal Ven respectively.It is aforementioned to continue, yet this moment, system was stable as yet, and this feedback signal Vfb can be pulled to a high potential, and this current sensing signal Vcs can do comparison with the slow enabling signal Vss of being somebody's turn to do of a bist signal, in order to the modulation pulse bandwidth.Wherein, this slow enabling signal Vss is used to prevent when the start of this power supply unit, because output voltage sets up as yet, because of responsibility cycle (duty cycle) moment of pulse bandwidth opens very greatly, causes the saturated or other problem of transformer to take place.
When this power supply unit got into this steady state operation, the enable signal Ven of these power control unit 102 these electronegative potentials of output was to end this activation switch element 104.That is when system feedback was set up, this feedback signal Vfb can be drawn back into a stabilization signal, and this moment, this feedback signal Vfb can be lower than this slow enabling signal Vss.That is, when one the 8th time t8, when this feedback signal Vfb friendship downwards should be delayed enabling signal Vss more, represent that then this power supply unit gets into this steady state operation.At this moment, this current sensing signal Vcs changes into this feedback signal Vfb relatively (but not with this slow enabling signal Vss), in order to the modulation pulse bandwidth.At this moment, when this power supply unit got into this steady state operation, the enable signal Ven of these power control unit 102 these electronegative potentials of output was to end this activation switch element 104.So, can confirm when system stability, just with this start-up control device 10 should supply power by auxiliary winding Wau end through this transformer Tr.In addition; On the enforcement aspect of other practical application, this power supply unit gets into the judgement of this steady state operation can basis, when one the 9th time t9; When handing over more, this feedback signal Vfb should delay enabling signal Vss downwards; And, when this current sensing signal Vcs reaches this feedback signal Vfb, represent that then this power supply unit gets into this steady state operation.Likewise, this current sensing signal Vcs changes into and this feedback signal Vfb comparison (and being and this slow enabling signal Vss), in order to the modulation pulse bandwidth.
By this, the conducting of this activation switch element 104 through controlling this start-up control device 10 with end, quicken the control that starts so that this power supply unit to be provided, and guarantee the power supply stability of this power supply unit.
See also Fig. 4 D quickens the start-up control circuit operation method of startup function for the present invention has flow chart.This start-up control circuit operation method is applied in the power supply unit, is coupled to the first side winding of a transformer through a power switch, with this transformer of switching controls, and then adjusts the output voltage of this power supply unit.
This start-up control circuit (not icon) comprises an electric capacity and a start-up control device.This electric capacity couples through an auxiliary winding of a diode and this transformer.This start-up control device electrically connects this first side winding, this electric capacity and this power switch of this transformer.
This start-up control device comprises an activation switch element and a power control unit.This activation switch element electrically connects this first side winding and this electric capacity of this transformer.This power control unit electrically connects this activation switch element; Receiving a feedback signal, a current sensing signal, a slow enabling signal, an operating voltage, a lower limit critical voltage, a upper limit critical voltage, a conducting voltage, so the conducting of controlling this activation switch element with end.Wherein, this lower limit critical voltage, this upper limit critical voltage, this conducting voltage and this slow enabling signal are produced by this start-up control device is inner.
This start-up control circuit also comprises an optical coupler and and detects resistance.This optical coupler electrically connects this power control unit of this start-up control device, so that this feedback signal to be provided.This detects this power switch of resistance series connection, so that this current sensing signal to be provided.
The method of operation of this start-up control circuit comprises the following step: at first, judge whether this power supply unit gets into a start mode of operation (S100).Wherein, when this operating voltage during, represent that then this power supply unit gets into this start mode of operation greater than this conducting voltage.If the non-entering of this power supply unit should start mode of operation, then execution in step (S100) again; Otherwise, if get into should start mode of operation for this power supply unit, then export a control signal controlling a power switch, and then switching transformer (S102).Then, judge whether this power supply unit gets into an abnormal voltage mode of operation (S200).Wherein, in step (S200), also comprise the following step: at first, judge whether this power supply unit gets into a upper limit critical voltage mode of operation (S202).Wherein, when this operating voltage during, represent that then this power supply unit gets into this upper limit critical voltage mode of operation greater than this upper limit critical voltage.If this power supply unit gets into this upper limit critical voltage mode of operation, then export the enable signal of this electronegative potential, to end an activation switch element (S206); Then, execution in step (S102) again again; Otherwise non-as if this power supply unit is upper limit critical voltage mode of operation, judges then whether this power supply unit gets into a lower limit critical voltage mode of operation (S204).Wherein, when this operating voltage during, represent that then this power supply unit gets into this lower limit critical voltage mode of operation less than this lower limit critical voltage.If this power supply unit gets into this lower limit critical voltage mode of operation, then export the enable signal of this high potential, with conducting one activation switch element (S208); Then, interrupt this control signal of output, and then stop to switch this transformer (S210); Then, execution in step (S100) again again.
Then, non-as if this power supply unit is the abnormal voltage mode of operation, judges then whether this power supply unit gets into a steady state operation (S300).That is, if this lower limit critical voltage mode of operation of the also non-entering of this upper limit critical voltage mode of operation of the non-entering of this power supply unit judges then whether this power supply unit gets into this steady state operation (S300).Wherein, when the friendship downwards of this feedback signal should be delayed enabling signal more, represent that then this power supply unit gets into this steady state operation.Perhaps, handing over downwards more when this feedback signal should slow enabling signal, and, when this current sensing signal reaches this feedback signal, represent that then this power supply unit gets into this steady state operation.
As if this steady state operation of the non-entering of this power supply unit, then export the enable signal of this high potential, with this activation switch element (S302) of conducting; Then, execution in step (S102) again.
At last,, then export the enable signal of this electronegative potential, to end this activation switch element if this power supply unit gets into this steady state operation; Then, execution in step (S102) again.
By this, through judging the mode of operation of this power supply unit, quicken the control that starts, and guarantee the power supply stability of this power supply unit so that this power supply unit to be provided.
Comprehensive the above, the present invention has following advantage:
1, the conducting of this activation switch element through controlling this start-up control device with end, quicken the control that starts so that this power supply unit to be provided;
2, the conducting of this activation switch element through controlling this start-up control device with end, to guarantee the power supply stability of this power supply unit.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (19)

1. one kind has the start-up control circuit that quicken to start function, is applied in the power supply unit, is coupled to the first side winding of a transformer through a power switch, with this transformer of switching controls, and then adjusts the output voltage of this power supply unit; It is characterized in that this start-up control circuit comprises:
One electric capacity provides an operating voltage; And
One start-up control device electrically connects this electric capacity and this power switch; This start-up control device comprises again:
One activation switch element electrically connects first side winding and this electric capacity of this transformer; And
One power control unit electrically connects this activation switch element, and receives this operating voltage, with the conducting of controlling this activation switch element with end;
Wherein, after this power supply unit started, when this power supply unit got into a upper limit critical voltage mode of operation, this power control unit was exported the enable signal of an electronegative potential, with by this activation switch element, this operating voltage was no longer continued to increase; When this power supply unit got into a lower limit critical voltage mode of operation, this power control unit was exported the enable signal of a high potential, with this activation switch element of conducting, made no longer continuous decrease of this operating voltage; In addition, when this power supply unit got into a steady state operation, the enable signal of this this electronegative potential of power control unit output was to end this activation switch element.
2. the start-up control circuit with acceleration startup function according to claim 1 is characterized in that this start-up control circuit also comprises:
One optical coupler electrically connects this power control unit of this start-up control device, and produces a feedback signal, with conducting that this activation switch element of this power control unit control is provided with end; And
One detects resistance, this power switch of connecting, and produce a current sensing signal, with conducting that this this activation switch element of power control unit control is provided with end.
3. the start-up control circuit with acceleration startup function according to claim 1; It is characterized in that; An inner lower limit critical voltage, a upper limit critical voltage, a conducting voltage and the slow enabling signal of producing of this start-up control device, with conducting that this this activation switch element of power control unit control is provided with end.
4. according to claim 1 have a start-up control circuit that quicken to start function, it is characterized in that, when received this operating voltage of this power control unit during greater than this conducting voltage, then get into should the start mode of operation for this power supply unit.
5. the start-up control circuit with acceleration startup function according to claim 1; It is characterized in that; When received this operating voltage of this power control unit during greater than this upper limit critical voltage, then this power supply unit gets into this upper limit critical voltage mode of operation.
6. the start-up control circuit with acceleration startup function according to claim 1; It is characterized in that; When received this operating voltage of this power control unit during less than this lower limit critical voltage, then this power supply unit gets into this lower limit critical voltage mode of operation.
7. according to claim 1 have a start-up control circuit that quicken to start function, it is characterized in that, handing over downwards more when received this feedback signal of this power control unit should be slow during enabling signal, and then this power supply unit is for getting into this steady state operation.
8. the start-up control circuit with acceleration startup function according to claim 1; It is characterized in that; When the friendship downwards of received this feedback signal of this power control unit should be delayed enabling signal more; And when received this current sensing signal of this power control unit reached this feedback signal, then this power supply unit got into this steady state operation.
9. one kind has the start-up control circuit operation method that quicken to start function, is applied in the power supply unit, is coupled to the first side winding of a transformer through a power switch, with this transformer of switching controls, and then adjusts the output voltage of this power supply unit; It is characterized in that the method for operation of this start-up control circuit comprises the following step:
(a) judge whether this power supply unit gets into a start mode of operation;
(b) if this power supply unit gets into the mode of operation of should starting shooting, then export a control signal to control a power switch;
(c) judge whether this power supply unit gets into an abnormal voltage mode of operation;
(d) if this abnormal voltage mode of operation of the non-entering of this power supply unit judges then whether this power supply unit gets into a steady state operation; And
(e) if this power supply unit gets into this steady state operation, then export the enable signal of an electronegative potential, to end an activation switch element.
10. the start-up control circuit operation method with acceleration startup function according to claim 1 is characterized in that, in step (c), also comprises the following step:
(c1) judge whether this power supply unit gets into a upper limit critical voltage mode of operation; And
(c2) if this upper limit critical voltage mode of operation of the non-entering of this power supply unit judges then whether this power supply unit gets into a lower limit critical voltage mode of operation.
11. the start-up control circuit operation method with acceleration startup function according to claim 10 is characterized in that, in step (c1), also comprises the following step:
(c11) if this power supply unit gets into this upper limit critical voltage mode of operation, then export the enable signal of this electronegative potential, to end this activation switch element; And
(c12) execution in step (b) again.
12. the start-up control circuit operation method with acceleration startup function according to claim 10 is characterized in that, in step (c2), also comprises the following step:
(c21) if this power supply unit gets into this lower limit critical voltage mode of operation, then export the enable signal of this high potential, with this activation switch element of conducting;
(c22) interrupt this control signal of output, and then stop to switch this transformer; And
(c23) execution in step (a) again.
13. the start-up control circuit operation method with acceleration startup function according to claim 9 is characterized in that, in step (e), also comprises the following step:
(e1), then export the enable signal of this high potential, with this activation switch element of conducting as if this steady state operation of the non-entering of this power supply unit; And
(e2) execution in step (b) again.
14. the start-up control circuit operation method with acceleration startup function according to claim 9 is characterized in that, in step (a), also comprises the following step:
(a1) if the non-entering of this power supply unit should start mode of operation, then execution in step (a) again.
15. start-up control circuit operation method like the 9th of claim; An operating voltage that is wherein received when a power control unit of this start-up control device is during greater than a conducting voltage that this power control unit received, and then get into should start mode of operation for this power supply unit.
16. the start-up control circuit operation method with acceleration startup function according to claim 9; It is characterized in that; An operating voltage that is received when a power control unit of this start-up control device is during greater than a upper limit critical voltage that this power control unit received, and then this power supply unit gets into this upper limit critical voltage mode of operation.
17. according to claim 9 have quicken to start function the start-up control circuit operation method; It is characterized in that; An operating voltage that is received when a power control unit of this start-up control device is during less than a lower limit critical voltage that this power control unit received, and then this power supply unit gets into this lower limit critical voltage mode of operation.
18. the start-up control circuit operation method with acceleration startup function according to claim 9; It is characterized in that; During a slow enabling signal that a feedback signal that is received when a power control unit of this start-up control device hands over downwards that this power control unit received more, then this power supply unit is for getting into this steady state operation.
19. the start-up control circuit operation method with acceleration startup function according to claim 9; It is characterized in that; When the feedback signal that a power control unit of this start-up control device is received is handed over the slow enabling signal that this power control unit received more downwards; And when a current sensing signal that this power control unit received reached this feedback signal, then this power supply unit got into this steady state operation.
CN2011100733174A 2011-03-25 2011-03-25 Startup control circuit possessing acceleration startup function and operation method thereof Pending CN102694459A (en)

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CN101860188A (en) * 2010-06-07 2010-10-13 鸿富锦精密工业(深圳)有限公司 Switch power supply circuit

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Publication number Priority date Publication date Assignee Title
EP0385546A1 (en) * 1989-03-02 1990-09-05 Koninklijke Philips Electronics N.V. Switched-mode power supply circuit including a starting circuit
CN1106594A (en) * 1993-10-28 1995-08-09 松下电器产业株式会社 Power apparatus
US20090278521A1 (en) * 2006-01-10 2009-11-12 Rohm Co., Ltd. Power Supply Device And Electronic Appliance Therewith
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Publication number Priority date Publication date Assignee Title
CN110623598A (en) * 2019-10-18 2019-12-31 峰岹科技(深圳)有限公司 Dust collector control method and device and dust collector
CN110623598B (en) * 2019-10-18 2021-07-20 峰岹科技(深圳)股份有限公司 Dust collector control method and device and dust collector

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Application publication date: 20120926