CN101753031B - Power conversion controller with very low power consumption and related method - Google Patents
Power conversion controller with very low power consumption and related method Download PDFInfo
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- CN101753031B CN101753031B CN 200810182842 CN200810182842A CN101753031B CN 101753031 B CN101753031 B CN 101753031B CN 200810182842 CN200810182842 CN 200810182842 CN 200810182842 A CN200810182842 A CN 200810182842A CN 101753031 B CN101753031 B CN 101753031B
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Abstract
The invention discloses a power conversion controller with very low power consumption and a related method, which can reduce cost. The power conversion controller comprises a hysteresis comparator, a comparator, a logic gate, an internal voltage regulator, a control circuit and a current source; the hysteresis comparator is provided with a first hysteresis reference voltage and a second hysteresis reference voltage, and is used for generating hysteresis comparing output signal; the comparator receives the compensation signal, and is compared with the feedback reference voltage and generates the feedback control signal; the logic gate is used for receiving the hysteresis comparing output signal and the feedback control signal, and generates power control signal; the internal voltage regulator is coupled with the logic gate, whether to generate internal working voltage is decided according to the power control signal.
Description
Technical field
The present invention relates to the power consumption of switch controller of power supply, refer to switch controller of power supply and the correlation technique of a kind of very-low power consumption (ultra-low power) especially.
Background technology
Fig. 1 shows display circuit square Figure 100 of the display interior of prior art; Comprise power circuit 110, scale controller 120 and backlight module 130; Power circuit 110 converts appropriate voltage 114,116 to via AC power 112 power supplies, gives the running of backlight module 130 and scale controller 120 and supply power respectively.Display circuit square Figure 100 can be applied in the middle of computer monitor (monitor), simulated television or the DTV.In the world trends of carbon reduction, many manufacturers all are devoted to the saving of the power consumption of display under holding state, and prior art utilizes the power circuit 110 of ac/dc conversion (AC/DC conversion) to carry out power saving.
Therefore very eagerly need develop the display circuit and the correlation technique that the very-low power consumption that a cover can implemented with low cost.
Summary of the invention
The present invention requires the technical problem of solution to provide a kind of switch controller of power supply and correlation technique of very-low power consumption, can reduce cost.
In order to solve above technical problem, the invention provides following technical scheme:
The present invention provides a kind of very-low power consumption switch controller of power supply, comprise hysteresis comparator, comparator, with door, internal voltage regulator, control circuit and current source; Hysteresis comparator has first hysteresis reference voltage and second hysteresis reference voltage, in order to produce hysteresis comparing output signal; Comparator receives the external compensation signal, relatively produces the back coupling controlling signal with feedback reference voltage; With door,, produce the power supply controlling signal in order to receive hysteresis comparing output signal and back coupling controlling signal; Internal voltage regulator is coupled to and door, and whether decision produces internal work voltage according to the power supply controlling signal; Control circuit comprises or door, first inverter and second inverter, control circuit according to hysteresis comparing output signal with feedback controlling signal Control current source startup and close.The very-low power consumption switch controller of power supply more comprises oscillator, SR flip-flop, comparator, and flip-flop is coupled to the output of oscillator and comparator, and oscillator can be via compensating signature by forbidden energy, and perhaps the output frequency of oscillator can be controlled via compensating signature; Comparator relatively compensates (COMP) signal and current sense (CS) signal is exported to produce relatively; Preferably, when compensating signature was advocated, switch controller of power supply got into the very-low power consumption pattern, and its power consumption is lower than switch controller of power supply and is in 1/10th of power consumption under the operator scheme.
The present invention provides a kind of very-low power consumption power control method, comprising: the conducting current source reached for first scheduled period, can feedback the open and close of this current source of controlling signal and hysteresis comparing output signal control according to this; Voltage regulator in the activation switch controller of power supply reached for one second scheduled period, and produced driving signal, for example pulse wave width modulation signal or pulse wave frequency modulating signal in this second scheduled period; Advocate to make switch controller of power supply get into the very-low power consumption pattern on the back coupling controlling signal; Voltage regulator and the oscillator in the forbidden energy switch controller of power supply for example makes the power consumption of switch controller of power supply be lower than switch controller of power supply and is in 1/10th of power consumption under the operator scheme; And separate and advocate that the back coupling controlling signal reached for the 3rd scheduled period so that switch controller of power supply reverts to normal operation.
The switch controller of power supply and the correlation technique of the very-low power consumption that the present invention adopts; When compensating signature is advocated; Switch controller of power supply gets into the very-low power consumption pattern, and its power consumption is lower than switch controller of power supply and is in 1/10th of power consumption under the operator scheme, thereby has reduced cost.
Description of drawings
Fig. 1 is the display circuit calcspar of the display interior of prior art.
Fig. 2 is the very-low power consumption display control circuit according to the specific embodiment of the invention.
Fig. 3 is the main oscillogram that is relevant to Fig. 2 embodiment.
Fig. 4 is the very-low power consumption display control circuit of another specific embodiment according to the present invention.
Fig. 5 is the very-low power consumption display control circuit of another specific embodiment according to the present invention.
Fig. 6 is the very-low power consumption display control circuit of another specific embodiment according to the present invention.
Fig. 7 is the flow chart of very-low power consumption display control method according to a particular embodiment of the invention.
Fig. 8 is the very-low power consumption switch controller of power supply according to a specific embodiment of the present invention.
Fig. 9 is the main signal waveform figure of very-low power consumption power source conversion control running among Fig. 8.
Figure 10 is the power conversion method flow chart according to the very-low power consumption of a specific embodiment of the present invention.
[primary clustering symbol description]
Each assembly that is comprised during this case is graphic is listed as follows:
100 display circuit square Figure 112 AC powers
110 power circuits, 114,116 voltage signals
120 scale controllers, 130 backlight modules
300,400,500 display control circuits, 302 AC powers
310 rectifiers, 320,420 bias circuits
330,530 transformers, 340,540,800 switch controller of power supply
342,542,842 current sources, 350,550 pressurizers
360 scale controllers, 370,570 optical coupling assemblies
560 display controllers, 810,820 comparators
830 hysteresis comparators, 812,822,852 signals
811 gain amplifiers, 840 oscillators
850 voltage regulators, 860 flip-flops
870,872 and the door 880 buffers
890 control circuits 892 or door
894,896 inverters
F1 fuse A, B node
NTC resistance
VDDP, VCC14V, VDD3V3, VCC5Vsense, COMP, HV, AC_OFF, DRV signal
R11, R12, R13, R2, R4, R5, R6, R72, R80, R82 resistance
D1, D21, D22, D3, D4, D5, D80 diode
Q1, Q2, Q3, Q4, Q8 transistor
C1, C2, C3, C4 electric capacity
Embodiment
Fig. 2 shows the very-low power consumption display control circuit 300 according to the specific embodiment of the invention, and AC power 302 supply alternating voltages are given through rectifier 310, for example 80 to 220 volts of alternating voltages; Giving bias circuit 320 and transformer (transformer) 330 through rectifier 310 rectification output dc voltages, for example is 120 to 375 volts of direct voltages, and rectifier 310 for example is a full bridge rectifier; Through bias circuit 320 bias voltages is that direct voltage signal VDDP supplies power to switch controller of power supply 340 runnings; Direct voltage signal VDDP for example is 20 volts of direct voltages; Switch controller of power supply 340 is the analog circuit chip; Usually be encapsulated as eight pin positions, because cost consideration has the pin number quantitative limitation.Transformer 330 utilizes coil-induced high-voltage dc voltage with its primary side to convert other suitable direct voltage to and exports in secondary side; Supply other circuit running; For example output dc voltage signal VCC14V and VCC5V; 14 volts and 5 volts of direct voltages are provided respectively, and 14 volts of direct voltages can be supplied the running of backlight module, for example the running of the backlight module of CCFL or light-emitting diode.Direct voltage signal VCC5V process, pressurizer 350, low pressure difference linear voltage regulator (lowdrop-out regulator, be called for short LDO) 350 for example, voltage stabilizing output dc voltage signal 3V3 and supplying power to the running of scale controller 360.Scale controller 360 is according to the running of the control of the voltage condition on the direct voltage signal VCC5V of transformer 330 outputs switch controller of power supply 340; For example; Direct voltage signal VCC5V is progressively approached buffer analog-digital converter (successive approximation ADC through what the dividing potential drop signal VCC5Vsense of resistance R 5, R6 sent scale controller 360 to; Abbreviation SAR ADC) voltage condition on the detecting direct voltage signal VCC5V; Know this skill personage and can understand that progressively to approach the buffer analog-digital converter be the low speed analog-digital converter that low cost can realize, perhaps, dividing potential drop signal VCC5Vsense is sent to a comparator (not shown) and a reference voltage of scale controller 360; For example 4 volts, the voltage condition on the detecting direct voltage signal VCC5V; Then; Scale controller 360 universal input and output capable of using (general purpose I/O; Abbreviation GPIO) the pin position is through the compensation pin position COMP of optical coupling assembly (opto-coupler or title photocoupler) 370 control switch controller of power supply 340; The unlatching of back coupling control switch controller of power supply 340 operates opportunity, reaches the purpose of very-low power consumption.It should be noted that; Knowing this skill personage can understand switch controller of power supply 340 and be the analog circuit chip; Usually being encapsulated as eight pin positions, wherein compensating pin position COMP and provide current source 342 in switch controller of power supply 340 inside, for example is the current source of 200 micromicroamperes (Ma).Bias circuit 320 comprises resistance R 11, R12, R13, diode D21, D22, transistor Q1, Q2, Q3.Bias circuit 320 utilizes resistance R 11, R12, transistor Q1 path that the high-voltage dc voltage bias voltage is supplied power to switch controller of power supply 340 runnings for direct voltage signal VDDP.
Switch controller of power supply 340 utilizes the stored electric charge of capacitor C1; When transistor Q1 closes and stops power supply, running that can of short duration power supply switching controller 340, still; Know this skill personage passable electrolysis condenser C1 when also being related to power initiation; Really beginning to supply normal direct voltage and operate the needed time, so capacitor C1 can not be too big, for example is 22 microfarads (μ F).Scale controller 360 then can utilize capacitor C2; When cutting off the electricity supply, running that can of short duration supply scale controller 360, typically capacitor C2 is quite big; For example be 2000 microfarads (μ F), it should be noted that the available storage electric power of capacitor C2 is big far beyond capacitor C1.
The very-low power consumption display control circuit 300 that Fig. 2 showed; Behind the shutdown system power supply; Utilize the of short duration running that is powered at scale controller 360 of capacitor C2; Through pressurizer 350 voltage stabilizing output dc voltage signal 3V3 and supplying power,, all can operate scale controller 360 as long as direct voltage signal VCC5V is higher than through the direct voltage signal 3V3 of pressurizer 350 voltage stabilizings output under the situation of operating voltage of scale controller 360 to the running of scale controller 360; The power consumption of pressurizer 350 is extremely low, and makes that the voltage drop LDODrop between direct voltage signal VCC5V and direct voltage signal 3V3 is minimum.The operating voltage of supposing scale controller 360 is 3.3 volts, via the discharge gradually of capacitor C2, as long as direct voltage signal VCC5V surpasses (3.3 volts+LDODrop), all can make scale controller 360 runnings.
Behind the shutdown system power supply; Scale controller 360 utilizes GPIO pin position to see the voltage status of signal AC_OFF with scale controller 360 off; Give switch controller of power supply 340 ends to draw electric current via resistance R 4 and 370 reactions of optical coupling assembly; 340 of switch controller of power supply utilize compensation pin position COMP to make current source 342 via resistance R 13, diode D21, D22 and this electric current of transistor Q3 supply; For example, the current conversion ratio of optical coupling assembly 370 (current transfer ration is called for short CTR) is 1:1; Then the electric current that draws of optical coupling assembly 370 both sides is 1:1, and the position that is relevant to direct voltage signal VCC5V during the opinion of signal AC_OFF (assertion) is accurate.When the voltage that senses scale controller 360 in compensation pin position COMP when switch controller of power supply 340 is lower than a predetermined level; Of short duration driving signal DRV is to open transistor Q4; The primary side of of short duration starting transformer 330 draws external power source; With to capacitor C 1 charging and to big capacitor C 2 chargings of the secondary side of transformer 330, for scale controller 360 the running of next cycle period.The direction of arrow indicates the main current direction in several circuit analyses among Fig. 2, makes to know the running that this skill personage can more understand present embodiment.
For switch controller of power supply 340, when advocating signal AC_OFF, for example be high levels; Optical coupling assembly 370 produces couple current, draws required couple current via node A, diode D21, D22 and optical coupling assembly 370, makes the base voltage of transistor Q3 descend; Turn-on transistor Q3 and diode D21, D22; Make the compensation pin position COMP drops that powers on, close transistor Q2, make the base potential of transistor Q1 descend and close transistor Q1; Transistor Q3 has the effect that electric current amplifies, and can quicken the velocity of discharge of current source 342, if the current capacity of the current source 342 in the switch controller of power supply 340 is low, then can save transistor Q3, directly leans on diode D22 to discharge.On the other hand, when separating opinion (corresponding English " deassert ") signal AC_OFF, for example be low level; The influence electricity stream, turn-on transistor Q1 and to capacitor C 1 charging compensates pin position COMP then and goes up voltage and rise gradually; Turn-on transistor Q2; Make transistor Q1 base earth and close transistor Q1, make switch controller of power supply 340 use the stored electric power of capacitor C 1, make capacitor C 1 discharge; Therefore, whether control switch controller of power supply 340 by the opinion of signal AC_OFF and whether operate, with control capacitance C1 charging, discharge cycles running.
Fig. 3 shows about the main oscillogram of the very-low power consumption display control circuit 300 of Fig. 2, comprises the waveform relationship figure between signal AC_OFF, voltage signal VDDP, signal DRV, voltage signal VCC5V, the sensing signal VCC5Vsense.Cooperate the very-low power consumption display control circuit 300 of Fig. 2 to describe; In this embodiment, after signal AC_OFF draws high, see through diode D21, D22 and optical coupling assembly 370 and force current source 342 discharges in the switch controller of power supply 340 to drag down current potential and close transistor Q1 apace; Force and cut off the power supply of external power source switch controller of power supply 340; And voltage signal VDDP is dragged down fast, continues to maintain 0 volt one period considerable time, reaches purpose of power saving.After signal AC_OFF dragged down, turn-on transistor Q1 was to capacitor C 1 charging; Make voltage signal VDDP fast rise, arrive the highest voltage after, for example 20 volts; Compensation pin position COMP powers on to press and is raised to predetermined level, and switch controller of power supply 340 is advocated signal DRV momently, for example by pulse wave width modulation (the pulsewidth modulation in the switch controller of power supply 340; Abbreviation PWM) controller produces the signal DRV of high low level width modulation momently; Perhaps produce the different signal DRV of frequency, turn-on transistor Q4 momently by pulse wave frequency modulating (pulse frequency modulation is called for short PFM) controller; Make the of short duration conducting of primary side of transformer 330 charge to capacitor C 1 charging and to the big capacitor C 2 of secondary side; For example voltage signal VCC5V is drawn high 5 volts apace, it can perhaps for example charge the scheduled periods to the big capacitor C 2 of secondary side by relatively reaching with a comparator and a reference voltage; As long as before voltage signal VCC5V discharges into predetermined voltage; But scale controller 360 is the variation of normal operation monitoring sensing signal VCC5Vsense all; So continue the circulation running; For example, as long as voltage signal VCC5V gets final product normal operation all greater than (3.3 volts+voltage drop LDODrop) in the middle of guaranteeing whole process.Sensing signal VCC5Vsense then shows the variation that discharges and recharges of corresponding voltage signal VCC5V.It should be noted that voltage signal VDDP continues to maintain 0 volt one period considerable time, make a good distance off during the driving of signal DRV; The consumption that can completely cut off external power source fully; Reach the purpose of very-low power consumption, through circuit simulation, total electricity consumes below Yue Keda 150 milliwatts (mW); And the extra cost of actual needs expenditure is very low, takes into account the consideration of cost and usefulness.The running of other accessory part in the present embodiment, for example fuse F1, negative temperature coefficient resistance NTC, resistance R 2, capacitor C 4 or the like can be understood just and repeated no more by knowing this skill personage.
Fig. 4 shows the very-low power consumption display control circuit 400 according to another specific embodiment of the present invention; Difference compared to the embodiment of Fig. 2 is bias circuit 420; Utilize resistance R 18 that bias voltage control is provided; And omitting transistor Q3, low order end shows that then 5 volts of signal PC5V from personal computer can be coupled to voltage signal VCC5V through diode D6, to capacitor C 2 chargings; And scale controller 360 also can extensively be integrated in display controller (display controller), is applied to simulated television and DTV, not escape category of the present invention.
Fig. 5 shows the very-low power consumption display control circuit 500 according to another specific embodiment of the present invention, and it mainly is the notion that is derived from Fig. 2 embodiment.Similarly signal also adopts the label of front signal, helps to understand the running of present embodiment.Main difference is that switch controller of power supply 540 integrated the similar assembly of bias circuit 320 among Fig. 2, and display controller 560 is directly detectd side voltage signal VDD3V3, saves the pin position of progressively approaching buffer analog-digital converter or comparator; Such as front embodiment announcement, detect the variation of side voltage signal VDD3V3 by display controller 560, for example, guarantee to detect side voltage signal VDD3V3 and be higher than 3.3 volts.For example, before voltage signal VDD3V3 is higher than 3.3 volts, can utilize GPIO pin position to advocate signal AC_OFF, make switch controller of power supply 540 stop to draw external power source via optical coupling assembly 570, compensation pin position COMP by display controller 560; Before voltage signal VDD3V3 falls 3.3 volts soon; Separate opinion signal AC_OFF by display controller 560; Switch controller of power supply 540 momently draws external power source via high voltage source pin position HV by Node B by opening the internal switch (not shown); Make and to capacitor C 1 charging, drive signal DRV via voltage signal VDDp ' momently by the controlled current source 542 that switch controller of power supply 540 is inner; The primary side of starting transformer 530 makes 530 pairs of capacitor C of transformer 1 charging and big capacitor C 2 chargings of secondary side are reached a predetermined voltage or charge a scheduled period.Power conversion controller 540 for a long time off the external power supply, can dramatically lowering power electricity.The direction of arrow indicates the main current direction in several circuit analyses, makes to know the running that this skill personage can more understand present embodiment.
According to the announcement of above many embodiment, know this skill personage and can make many possibly the variation, still escape category of the present invention not.For example, display controller 560 utilizes GPIO pin position controlling signal AC_OFF, via resistance R 4, optical coupling assembly 570; Back coupling control compensation pin position COMP; And whether control switch controller of power supply 540 draws external power source, the possibility of other variation can be arranged, for example; Can revise near the circuit the optical coupling assembly 570, make that the high low level of signal AC_OFF is opposite with respect to the running of switch controller of power supply 540; Perhaps, the collocation auxiliary circuit makes GPIO pin interdigit connect the running that control optical coupling assembly 570 draws electric current; Perhaps, more than many embodiment system accurate by the position of GPIO pin position output controlling signal AC_OFF, by near the circuit of revising the optical coupling assembly 570; Can make that GPIO pin position is the input mode running, as shown in Figure 6, optical coupling assembly 570 is coupled to the GPIO pin position of display controller 560 via resistance R 72; Control via transistor Q8 whether conducting is discharged; When controlling signal CTRL is advocated, turn-on transistor Q8 causes the running of switch controller of power supply 540 similar previous embodiment in signal COMP.
Fig. 7 shows the flow chart of very-low power consumption display control method according to a particular embodiment of the invention.In step 702, the direct voltage position of sensing Circuit Fault on Secondary Transformer is accurate, for example, can sensing Fig. 2 in the variation of signal VCC5V, the perhaps variation of direct sensing signal VDD3V3 for example, guarantees that signal VDD3V3 all is higher than 3.3 volts; In step 704, display controller is controlled the compensation pin position of switch controller of power supply by GPIO pin position conducting optical coupling assembly; And the running of powered-down switching controller is for example, as shown in Figure 5; Display controller 560 can advocate that signal AC_OFF increases the size of the couple current of optical coupling assembly 570 by GPIO pin position, and the running of powered-down switching controller 540, perhaps; As shown in Figure 6; Optical coupling assembly 570 is coupled to the GPIO pin position of display controller 560, forms discharge path by transistor Q8, and the running of powered-down switching controller 540; In step 706, descend when arriving a predetermined level when the direct voltage position is accurate, via the size of the couple current of GPIO pin potential drop low light coupling assembly, the compensation pin position of control switch controller of power supply, and start the running of switch controller of power supply; In step 708; The primary side of of short duration conducting transformer; To first electric capacity and the of short duration charging of second electric capacity, for example, as shown in Figure 5; By the gate of pulse wave width modulation or pulse wave frequency modulating oxide-semiconductor control transistors Q4, make 530 pairs first capacitor C of transformer 1 and second capacitor C 2 of secondary side charge.
Fig. 8 shows the very-low power consumption switch controller of power supply 800 according to a specific embodiment of the present invention; Have pin positions such as HV, VDDp, DRV, CS, COMP and GND; When the embodiment running that is applied to Fig. 5, the running such as the previous embodiment of each pin position external circuit of Fig. 8 are said.Very-low power consumption switch controller of power supply 800 comprise comparator 810,820, hysteresis comparator 830, oscillator 840, current source 842, voltage regulator 850, flip-flop 860, with door 870,872, buffer 880, control circuit 890, resistance R 80, R82, neat sodium diode D80.
The main signal waveform figure of very-low power consumption switch controller of power supply 800 runnings in Fig. 9 displayed map 8, V (VDDP), V (COMP), I (HV), I (VDDp), V (DRV), 5V signal are represented voltage signal, the voltage signal on the COMP pin position, the size of current of HV pin position, the size of current of VDDp pin position, the voltage signal of DRV pin position, the 5V voltage signal of VDDp pin position respectively.When switch controller of power supply 800 has just started; Charge via the electric capacity (not shown) outside 842 pairs of VDDp pin of current source position in HV pin position; The anode input voltage that is elevated to hysteresis comparator 830 when current potential gradually is higher than the first hysteresis reference voltage VDDH; The outputting level of hysteresis comparator 830 is high, makes to be output as height with door 870, and activation voltage regulator 850 output services voltages are in the running of signal 852 power supply source switching controllers 800 inside; And; The output high levels of hysteresis comparator 830 via or the door 892 with inverter 894; Turn off current source 842; Stop HV pin position and draw electric current from the outside, this or door 892 guarantee with inverter 894 control paths as long as the output high levels of hysteresis comparator 830 can turn off current source 842 block outside power consumption.Oscillator 840 produces the S input that a square-wave signal is exported to SR flip-flop 860, and the R input of SR flip-flop 860 is low level at the beginning, and the Q output transfers high levels to; On DRV pin position, drawn high levels, the outside transistor (not shown) that connects can be switched on, and high levels also can and then be drawn in current sense (CS) pin position therefore; Through comparator 810, the R input of SR flip-flop 860 can change high levels into, when SR flip-flop 860 is accepted to trigger next time; The S input and the R input of R flip-flop 860 are respectively low level and high levels, and after the triggering, the Q output transfers low level to; That is to say; The running of this circuit, the input of S input and the R input just all anti-phases when triggering that are as the criterion are to produce the pulse wave width modulation signal on DRV pin position.For example, square-wave signal is the square-wave signal of 1MHz, reduces the power consumption of very-low power consumption switch controller of power supply 800 under standby mode, sees through with door 872 and buffer 880 square-wave signal is exported on DRV pin position.Then, the electric capacity (not shown) outside the VDDp pin position slowly disengages stored electric power, arrives the second hysteresis reference voltage VDDL up to the anode input voltage of hysteresis comparator 830; Make the outputting level of hysteresis comparator 830 change low by height, feasible and door 870 is output as low, is output as low with door 872; DRV pin position is output as low; Close connection on it the external transistor (not shown) and close the primary side of external transformer (not shown), as shown in Figure 9, I (HV) signal draws charging current Icharge at the beginning; In V (VDDP) from voltage VDDH to voltage VDDL, the rapid drawdown of I (HV) signal (from external power source) current sinking is Ihv_off.The electric current that I (VDDp) correspondence discharges is Istartup and Iop, and electric current I op power supply switching controller 800 drives the square-wave signal on the DRV pin position.
Then, after the primary side conducting of external transformer, the display controller (not shown) side of secondary side obtains electric power and can operate, and can control V (COMP) signal.The control of the COMP pin position that discloses by previous embodiment; Via the compensating signature on the control COMP pin position; The real time length that can let the time interval that produces the pulse wave width modulation signal elongate, produce also shortens; But operate under the mode that still lets switch controller of power supply 800 monitored fully, be unlikely letting whole system is out of control can't be waken up.
When the voltage of V (COMP) signal drags down, the running of forced closing oscillator 840, perhaps; The height of the output frequency of modulation oscillator 840 in response to the current potential height of V (COMP) signal; For example, the current potential height of V (COMP) signal then output frequency uprises, the low then output frequency step-down of the current potential of V (COMP) signal; Or reverse running, current potential height that therefore can V (COMP) signal can influence the power consumption of switch controller of power supply 800; And control comparator 820 with positive terminal voltage and feedback reference voltage Voff relatively after, low level is output in feedbacks controlling signal 822, makes and 870 is output as low level; The running of forbidden energy voltage regulator 850; The internal power supply of powered-down switching controller 800 makes switch controller of power supply 800 get into the very-low power consumption patterns, and electric current I (VDDp) moment is reduced to Ioff; Preferably electric current I off is less than electric current 0.1*Iop; Perhaps lower, the ten minutes that the decrease speed of V (VDDP) current potential becomes is slow, and just V (VDDP) current potential descending slope diminishes; And can significantly elongate next time by control V (COMP) signal and begin the time to the external capacitive charging, reduce the power consumption of whole system; It should be noted that; Drag down V (COMP) signal can so that low level be output in feedback controlling signal 822 via inverter 896 with or door 892 forced closing current sources 842; Stop HV pin position and draw electric current from the outside; Because this moment, the output of hysteresis comparator 830 was in high levels, the running of turn off current source 842.That is to say that simple control circuit 890 comprises or door 892 and inverter 894,896 Control current source 842 startups in good time and the opportunity of cutting out.
Return among Fig. 8, when the action that stops to drag down V (COMP) signal, just after the voltage on the control COMP pin position exceeds feedback reference voltage Voff; 822 standards of back coupling controlling signal are high, and electric current I (VDDp) reverts to Iop, and outside big electric capacity (not shown) recovers the running electric power of power supply switching controller 800 once more; Switch controller of power supply 800 normal operations are VDDL to V (VDDP) voltage, and at this moment, the anode input voltage of hysteresis comparator 830 arrives the second hysteresis reference voltage VDDL; Just make the outputting level of hysteresis comparator 830 change low by height; Make to be output as lowly that be output as lowly with door 872, the output of DRV pin position transfers low level to door 870.
Then, HV pin position is via after the of short duration charging of electric capacity (not shown) outside the VDDp of 842 pairs of pin positions of current source, and V (VDDP) current potential is charged to VDDH from VDDL, and electric current I (VDDp) begins to discharge so to circulate and operates.And COMP pin position can be passed through gain amplifier 811 earlier; 1/2 gain adjustment for example gains; This gain adjustment can be adjusted according to the side circuit design, after the comparison of entering comparator 810, and the R input of control SR flip-flop 860; 1 volt (V) is the scope that illustration comparator 810 compares voltage; In this embodiment, comparator 810 is known this technological personage and is changed when making possible circuit change comparing in CS pin position voltage and COMP voltage and two accurate scopes in position of 1V voltage.
Figure 10 shows that in step 1020, conducting one current source reached for first scheduled period according to the power conversion method flow chart of the very-low power consumption of a specific embodiment of the present invention, and for example charging arrives voltage VDDH; In step 1030, the voltage regulator in activation one switch controller of power supply reached for second scheduled period, and produced the driving signal in second scheduled period, for example was pulse wave width modulation signal or pulse wave frequency modulating signal; In step 1040, advocate (assert) back coupling controlling signal, for example be the back coupling controlling signal 822 among Fig. 8; The forbidden energy voltage regulator makes switch controller of power supply get into a very-low power consumption pattern, preferably; Under the very-low power consumption pattern institute's consumed current be lower than normal operation size of current 1/10th; Perhaps lower, preferably, but advocate also forced closing current source of back coupling controlling signal; In step 1060, to separate then and advocate that the back coupling controlling signal lets switch controller of power supply recover normal operation arrival external capacitive and discharges into voltage VDDL, running just reached for the 3rd scheduled period, and the control external capacitive is charged to voltage VDDH from voltage VDDL.
In sum, the present invention discloses a kind of very-low power consumption switch controller of power supply, comprises hysteresis comparator, comparator, logic lock, internal voltage regulator, control circuit and current source; Hysteresis comparator has first hysteresis reference voltage and second hysteresis reference voltage, in order to produce hysteresis comparing output signal; Comparator receives the external compensation signal, relatively produces the back coupling controlling signal with feedback reference voltage; The logic lock can be and door, in order to receive hysteresis comparing output signal and back coupling controlling signal, produces the power supply controlling signal; Internal voltage regulator is coupled to and door, and whether decision produces internal work voltage according to the power supply controlling signal; Control circuit comprises or door, first inverter and second inverter, control circuit according to hysteresis comparing output signal with feedback controlling signal Control current source startup and close.The very-low power consumption switch controller of power supply more comprises oscillator, SR flip-flop, comparator, and flip-flop is coupled to the output of oscillator and comparator, and oscillator can be via compensating signature by forbidden energy, and perhaps the output frequency of oscillator can be controlled via compensating signature; Comparator relatively compensates (COMP) signal and current sense (CS) signal is exported to produce relatively; Preferably, when compensating signature was advocated, switch controller of power supply got into the very-low power consumption pattern, and its power consumption is lower than switch controller of power supply and is in 1/10th of power consumption under the operator scheme.
The present invention more discloses a kind of very-low power consumption power control method, comprising: the conducting current source reached for first scheduled period, can feedback the open and close of this current source of controlling signal and hysteresis comparing output signal control according to this; Voltage regulator in the activation switch controller of power supply reached for one second scheduled period, and produced driving signal, for example pulse wave width modulation signal or pulse wave frequency modulating signal in this second scheduled period; Advocate to make switch controller of power supply get into the very-low power consumption pattern on the back coupling controlling signal; Voltage regulator and the oscillator in the forbidden energy switch controller of power supply for example makes the power consumption of switch controller of power supply be lower than switch controller of power supply and is in 1/10th of power consumption under the operator scheme; And separate and advocate that the back coupling controlling signal reached for the 3rd scheduled period so that switch controller of power supply reverts to normal operation.
In sum, though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Anyly have the knack of this art, do not breaking away from the spirit and scope of the present invention, when doing various changes and retouching, protection scope of the present invention should be as the criterion with claim.
Claims (12)
1. very-low power consumption switch controller of power supply is characterized in that it comprises:
One hysteresis comparator has one first hysteresis reference voltage and one second hysteresis reference voltage, in order to produce a hysteresis comparing output signal;
One first comparator has a feedback reference voltage, in order to receive a compensating signature, relatively produces a back coupling controlling signal with this feedback reference voltage;
One logic lock in order to receive this hysteresis comparing output signal and this back coupling controlling signal, produces a power supply controlling signal; And
One internal voltage regulator is coupled to this logic lock, in order to whether to produce an internal work voltage according to this power supply controlling signal decision.
2. very-low power consumption switch controller of power supply as claimed in claim 1 is characterized in that, more comprises a current source, and this hysteresis comparing output signal and this back coupling controlling signal can be controlled the startup of this current source and close.
3. very-low power consumption switch controller of power supply as claimed in claim 1 is characterized in that, this logic lock be one with the door.
4. very-low power consumption switch controller of power supply as claimed in claim 1; It is characterized in that; More comprise an oscillator, a flip-flop, one second comparator; The input of oscillator receives compensating signature, and the output of this oscillator is coupled to an input of this flip-flop, and the output of this second comparator is coupled to another input of this flip-flop.
5. very-low power consumption switch controller of power supply as claimed in claim 4 is characterized in that, this oscillator can be via this compensating signature by forbidden energy.
6. very-low power consumption switch controller of power supply as claimed in claim 4 is characterized in that, an output frequency of this oscillator can be controlled via this compensating signature.
7. very-low power consumption switch controller of power supply as claimed in claim 4 is characterized in that, this second comparator relatively this compensating signature and a current sense signal to produce a relatively output, to control this flip-flop.
8. very-low power consumption switch controller of power supply as claimed in claim 4 is characterized in that, this flip-flop system is a SR flip-flop.
9. very-low power consumption switch controller of power supply as claimed in claim 1 is characterized in that, more comprises a control circuit and a current source, this control circuit according to the startup of this current source of this hysteresis comparing output signal and this back coupling controlling signal control with close.
10. very-low power consumption switch controller of power supply as claimed in claim 9; It is characterized in that; This control circuit comprises one or door, one first inverter and one second inverter, should or the input of door couple and first inverter and this logic lock, output couples and second inverter.
11. very-low power consumption switch controller of power supply as claimed in claim 1 is characterized in that, when this compensating signature was advocated, this very-low power consumption switch controller of power supply got into a very-low power consumption pattern.
12. very-low power consumption switch controller of power supply as claimed in claim 11; It is characterized in that; Among this very-low power consumption pattern, the power consumption of this very-low power consumption switch controller of power supply is lower than this very-low power consumption switch controller of power supply and is in 1/10th of power consumption under the operator scheme.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810182842 CN101753031B (en) | 2008-12-10 | 2008-12-10 | Power conversion controller with very low power consumption and related method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810182842 CN101753031B (en) | 2008-12-10 | 2008-12-10 | Power conversion controller with very low power consumption and related method |
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| Publication Number | Publication Date |
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| CN101753031A CN101753031A (en) | 2010-06-23 |
| CN101753031B true CN101753031B (en) | 2012-12-12 |
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| CN 200810182842 Expired - Fee Related CN101753031B (en) | 2008-12-10 | 2008-12-10 | Power conversion controller with very low power consumption and related method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202435289U (en) * | 2010-12-13 | 2012-09-12 | 成都成电硅海科技股份有限公司 | Switching type multi-power-source management circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6211579B1 (en) * | 1999-09-29 | 2001-04-03 | Lucent Technologies, Inc. | Multiple output converter having a low power dissipation cross regulation compensation circuit |
| CN1902811A (en) * | 2003-11-21 | 2007-01-24 | 美国快捷半导体有限公司 | Power converter having improved control |
| CN101051222A (en) * | 2007-05-10 | 2007-10-10 | 武汉立方科技有限公司 | Low power wireless gate controller |
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2008
- 2008-12-10 CN CN 200810182842 patent/CN101753031B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6211579B1 (en) * | 1999-09-29 | 2001-04-03 | Lucent Technologies, Inc. | Multiple output converter having a low power dissipation cross regulation compensation circuit |
| CN1902811A (en) * | 2003-11-21 | 2007-01-24 | 美国快捷半导体有限公司 | Power converter having improved control |
| CN101051222A (en) * | 2007-05-10 | 2007-10-10 | 武汉立方科技有限公司 | Low power wireless gate controller |
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| CN101753031A (en) | 2010-06-23 |
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