CN101938219B - Cascade switchover power converter, integrated circuit, and the control method of the transfers pattern of accessory power supply operation - Google Patents
Cascade switchover power converter, integrated circuit, and the control method of the transfers pattern of accessory power supply operation Download PDFInfo
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Abstract
A kind of concatenated power transducer running its accessory power supply from the second power switched level, this concatenated power transducer can realize Effec-tive Function by just starting accessory power supply in starting process.In the second power switched level, start transfers operational mode, so that accessory power supply output to be powered, and at load, do not produce significantly interference.After starting the first power switched level and after intermediate node voltage rises to the level that be enough to run the second power switched level, terminal power switched level enters normal operation mode.Transfers operational mode can significantly reduce switching rate and pulse width compared with regular run mode.
Description
Technical field
The present invention relates generally to power switched adjuster circuit, particularly relate to a kind of cascade power switched and turn
Parallel operation, wherein by running this switchover power converter under transfers pattern, makes auxiliary winding electricity
Source obtains the energy provided by whole power converter level.
Background technology
For powering to the control circuit of line powering switchover power converter, LVPS need to be used,
Its voltage when several milliampere electric current typically at 3V to 12V between.But, until power
Transducer runs, and the sole source that typical case can use is exchange (AC) electric lines of force.Merit in resistor
Consumption, typically in several wattage magnitudes, thus can not pass through resistance in high-tension AC electric lines of force
Voltage is down to the voltage of controller requirement by device.
Accordingly, because use auxiliary winding can produce low voltage, on one of transducer magnetics
Auxiliary winding be frequently utilized for converter controller integrated circuit (integrated circuit, IC) supply
Electricity, thus can reduce dissipated power.Accessory power supply can be run from the first order, but supply at AC circuit
In electricity cascaded inverters, the induction apparatus/transformer current of the first order can change with input voltage.?
One-level is in the cascaded inverters of power factor corrector (power factor corrector, PFC), defeated
Enter electric current to change by proportional relationship with input voltage.Circuit input be rectified and filtered other
In cascaded inverters, unless wave filter is respectively provided with low pulsation thus phase under all loading conditions
When greatly, sizable AC being occurred to change in input the most under high loading conditions.Therefore,
In this type of application, it is desirable on one of magnet assembly that auxiliary winding is placed in the second level.In cascade
In power converter, usually until just start second when the output voltage of the first order has reached certain level
Level, to guarantee the properly functioning of the second level.Therefore, when typically starting at least up to the second level, just stop
Only use the resistor voltage fall electric source structure generally using Zener diode regulation output voltage, thus
Aggregate efficiency can be reduced and improve the temperature produced by power supply.
By DC-to-dc (DC-DC) converter level that can receive its input from first order PFC
To the second level, accessory power supply is powered, and the output voltage of this second level accessory power supply still turns with DC-DC
The intermediate node voltage change of parallel operation input, this intermediate node voltage can be with PFC input
The size variation of AC power voltage line.It is enough to be used in for guaranteeing to be respectively provided with under the conditions of all input lines
The voltage of operation controller integrated circuit, the highest accessory power supply output voltage will be minimum
Require output voltage.Therefore, or must by IC design become can be used for FR can be by auxiliary
Help the supply voltage that winding provides, or such as Zener diode circuit regulation voltage must be used, by
This dissipated power and heat and typically reduce reliability.
Accordingly, it is desired to provide a kind of concatenated power transducer, this concatenated power transducer can internally be controlled
Device circuit processed provides a kind of auxiliary electricity that can run from second (or rear) level of concatenated power transducer
Source.It also would be desirable to provide this accessory power supply that can run under widely varied auxiliary winding voltage,
And without Zener diode or other consume formula regulation technologies.
Summary of the invention
Above-mentioned purpose is directed at cascading in switching converter provides its auxiliary power circuit a kind of from second
The concatenated power transducer that level or more rear class are run, and a kind of method running this switching converter.
The first order of cascade switching converter receives its input from power supply, and this first order can be AC
Electric lines of force, and its output couples with intermediate node.Cascade switching converter also has the second level, and this is the years old
The input of two grades couples with intermediate node, and output provides the output of concatenated power transducer.Auxiliary winding
Being positioned on the magnetic couplings element of the second level, and the second level includes start control circuit, this starting controls
Circuit runs the during the second level starts and before the first order starts under transfers pattern
Two grades, to provide the voltage on auxiliary winding.Therefore, accessory power supply can be during the second level starts
Run, and sizable electric current will not be produced at the output of concatenated power transducer.Magnetic couplings unit
Part can be a kind of transformator not storing big energy at run duration, or a kind of by discrete
Current switching carries out induction apparatus or the transformator of energy transmission.
Auxiliary winding, this operational mode can be installed on the auxiliary power circuit with optional operational mode
Have for every kind of distinctive different input/output voltages of operational mode.Can be according to defeated to accessory power supply
The measurement going out voltage is dynamically selected the operational mode of accessory power supply, and thus offer can further improve auxiliary
Help the hysteresis controller of power-efficient.
By the preferred embodiment of the present invention below in conjunction with detailed description, it can be seen that the present invention is above-mentioned and other
Objects, features and advantages.
Accompanying drawing explanation
Fig. 1 is the block chart cascading switching converter described in the embodiment of the present invention.
Fig. 2 is the local detail rough schematic view of Fig. 1 cascade switching converter.
Fig. 3 is the detailed schematic of accessory power supply 16 in Fig. 1.
Fig. 4 is the operation detail signal waveform of Fig. 1 cascade switching converter described in the embodiment of the present invention
Figure.
Fig. 5 is the operation detail signal oscillogram of switching converter in Fig. 1 described in the embodiment of the present invention.
Fig. 6 be can be used for described in alternative embodiment of the present invention realize accessory power supply 16 in Fig. 1 can
Select the detailed schematic of accessory power supply 16A.
Detailed description of the invention
The present invention includes the auxiliary power circuit in cascaded inverters and to cascade power switched conversion
The method that control in device and/or other circuit are powered, wherein from the of cascade switchover power converter
Two (or rear) level provides accessory power supply.Concatenated power transducer can be that rear portion has DC-DC to turn
The power factor corrector (power factor corrector, PFC) of parallel operation level.In cascaded inverters
Second (or rear) level has transfers pattern.Transfers pattern can provide enough energy
Charging to the output of accessory power supply, this can enter at the auxiliary winding of one of the magnet assembly of the second level
OK.Transfers pattern generally has low than switching rate and the pulse width of the properly functioning middle second level
Switching rate much and relatively low pulse width, so that do not disturb during transfers operational mode
The load being connected with the output of cascaded inverters, or not to this load supplying.
There is the auxiliary power circuit of optional operational mode for changing the distinctive output of accessory power supply/defeated
Enter voltage, to compensate the change of second level input voltage.Such as, before PFC input stage is run,
Input voltage peak can be obtained between the intermediate node two level interconnected, and can obtain after the first order is run
Peak-to-peak voltage, thus makes the voltage obtained by auxiliary winding that the change of 2: 1 occurs.Accessory power supply
Operational mode can be used for compensating this change and other changes, and can run in lag feedback structure,
Selectable modes in this configuration, to regulate accessory power supply output voltage.
Fig. 1 shows the cascade switchover power converter 8 described in the embodiment of the present invention.Switch controller
10 provide control signal, to control first order PFC14 and second level dc-dc 15
In the switching device that connected by intermediate node.Capacitor CLINKKeep intermediate node voltage, electric capacity
Device CRECTThe input voltage provided to PFC14 from commutator 12, this commutator 12 are provided
By electromagnetic interference (electromagnetic interference, EMI) wave filter 11 and AC electricity
Line of force source 17 couples.In illumination applications, the output of dc-dc 15 is in listed enforcement
For powering to LED in example.But, the technology of the present invention can be in other be applied
In concatenated power transducer and the cascade construction in addition to PFC/DC-DC.
Dc-dc 15 includes accessory power supply 16, and this accessory power supply 16 is to controller 10
The electric power run needed for internal circuit is provided, and operation PFC14 and dc-dc are provided
Door needed for switching device in 15 drives electric current.Resistor R can be passed throughS1With resistor RS2Obtain
Obtain electric power, until accessory power supply 16 can produce at least some circuit being enough in operation controller 10
Voltage.Can be from the auxiliary winding provided by the magnetic couplings element of dc-dc 15
Aux runs accessory power supply 16.Therefore, after dc-dc 15 has started to switching, auxiliary
Winding aux is helped only to produce output voltage VAUX.Operation with cascade switchover power converter 8 is suitable
Sequence is similar to, and the conventional operation order of typical case's cascaded inverters is as follows: once capacitor CRECTBetween two
Voltage reach predetermined threshold voltage, begin to run PFC14；Then, at capacitor CLINKTwo
Between voltage VLINK(by voltage V after having reached steady-state valueLINKReach another predetermined threshold voltage
Instruction), bring into operation dc-dc 15.But, according to embodiments of the invention, cascade
Switchover power converter 8 provides a kind of transfers pattern, runs at PFC14 in this mode
While or optional before, dc-dc 15 can be started.
Fig. 2 shows the details of Fig. 1 cascade switchover power converter 8.Induction apparatus L1 and cutting
Changing transistor N1 and provide boosting structure PFC, this boosting structure PFC can be by capacitor CLINK
Charge to the voltage of about 400VDC, thus at capacitor CRECTTwo between formed 360VDC
Input voltage.The door of transistor N1 is controlled by controller 10, so that PFC14
Input impedance is generally without idle component, i.e. PFC14 is rendered as AC electric power line source 17 liang
Between resistance.Before starting, owing to diode D1 is used as peak detector, at AC electric power
Behind first input peak of line source 17, at capacitor CLINKTwo between rectification type AC electric power occurs
The peak pressure of line source 17.Controller 10 can run dc-dc under transfers pattern
15, and seldom switch and there is burst pulse, to produce accessory power supply output voltage VAUX, as hereafter
Described.
Dc-dc 15 is a kind of push-pull type forward converter, and it is the two of transformator T1
Switching transistor N2 and N3 successively between the two of decile armature winding, produces two pole power waveforms.?
At the secondary windings of transformator T1, two pole power waveforms are carried out whole by diode D2 and D3
Stream, and combined capacitor C by induction apparatus L2OUTIt is filtered.As it has been described above, transformation
Device T1 also powers to auxiliary winding aux.Resistor RISPressure is provided to switch controller 10
Fall.Resistor RISPressure drop between two and the electric current switched by transistor N2 or transistor N3
Proportional, current-mode feedback is thus provided, the electric current that instruction is applied by load, such as in Fig. 1
LED.
In an operation example, before switching any switching transistor N1-N3, due to at electricity
The rectified signal occurred between the two of container CRECT carries out blob detection, at capacitor CLINKTwo between
The voltage (peak pressure of typical case's AC electric power line source) of about 160VDC can be obtained.Upon resistance
Device RS1With resistor RS2The voltage obtained be enough to operation controller, and that controller is initial
Changing, controller 10 begins to run PFC14, to boost and to regulate at capacitor CLINKBetween two
Voltage.Controller 10 also begins to switch with the very low-repetition-frequency of such as 20kHz in a short time
Transistor N2 and N3 in dc-dc 15；Although this is not enough in a short time
A large amount of electric current (e.g., less than the 5% of nominal current) is provided to pass through LED, but
The electric current that can provide enough passes through the auxiliary winding aux of transformator T1, defeated to produce accessory power supply
Go out voltage VAUX.Due to low rate switching transistor N2 and N3, the electricity of accessory power supply 16
Stream requires also below the requirement during the conventional handover operation of dc-dc 15.Once electricity
Pressure VLINKThe most fully raising, dc-dc 15 is just placed in conventional fortune by controller 10
Row mode.Owing to starting the output just multiplication of switching, PFC15 once transistor N1, thus one
Denier voltage VLINKHaving risen to its full voltage value, the voltage available between auxiliary winding aux two is the most about
For the twice of voltage during starting transfers pattern.According to the pattern choosing provided by controller 10
Select signal mode, or by the internal detection of model selection condition hereinafter described, now can change auxiliary
The operational mode of power supply 16.
Although aforesaid operations order is used for starting, in the application of the most described LED illumination application,
When LED completely closes (this can be carried out according to duty cycle in dimmed period),
Or when 100% is dimmed, output can be disabled by stopping switching dc-dc 15, and
PFC14 continues regulation voltage VLINK.Therefore, for the output of accessory power supply 16 is maintained electricity
Pressure VAUX, the transfers pattern of dc-dc 15 can be again introduced into, and by luminescence
A small amount of electric current that diode (LED) produces will not interfere with dimmed operation.
Assume to flow to controller 10 before PFC14 starts and after PFC14 starts
Voltage be identical, starting or leave dimmed pattern and return after routine operation, if auxiliary
Power supply 16 only includes the linear regulating circuit of such as Zener diode, the then merit in accessory power supply 16
Consumption is by about identical with the power flowing to controller 10.Therefore, the accessory power supply in described embodiment
16 include the doubler with above-mentioned optional operational mode.Accessory power supply 16 is under an operational mode
The size of the DC output produced is essentially equal to available peak-to-peak voltage between auxiliary winding aux two
Half, under another operational mode produce DC output size be essentially equal to auxiliary around
The meansigma methods of group two voltage available peak values of aux.Under two kinds of operational modes, by circuit pressure drop
The virtual voltage exporting applying at accessory power supply 16 can be reduced.During starting and in control
Before device 10 starts the conventional operation of dc-dc 15, can be by controller by using
The 10 control signal patterns providing or can determining in accessory power supply 16, can be by accessory power supply 16
It is placed under multiplexer pattern, as mentioned below.At PFC14 boosting capacitor CLINKBetween two
Voltage available after, accessory power supply 16 or be placed under non-multiplexer pattern, or in delayed regulation
Run under pattern, as mentioned below.
Fig. 3 shows the details of the accessory power supply 16 described in the embodiment of the present invention.Accessory power supply 16
Input be connected with the auxiliary winding aux of transformator T1.Owing to diode D14 will keep anti-
To biasing and diode D11 short circuit, capacitor C1 will assist winding aux and auxiliary electricity
The input in source 16 carries out AC coupling, with by starting the first fortune that transistor N10 selects
Diode D11 and D14 is effectively removed under row mode.In the first operating mode, accessory power supply electricity
Road 16 is used as voltage-multiplier circuit.
Negative under the multiplexer operational mode of accessory power supply 16, between auxiliary winding aux two
During voltage, diode D13 turn on, and capacitor C1 to auxiliary winding aux two between can
Charge with voltage negative peak, thus reduce the pressure drop of diode D13, and diode D12 is in this phase
Period is reverse biased.During next between auxiliary winding aux two can use positive phase voltage, two poles
Pipe D13 is reverse biased, and diode D12 conducting.At auxiliary winding aux during positive
Voltage between two is added with voltage on the capacitor cl during front negative, causes " voltage phase
Add " phenomenon.The voltage-multiplier circuit realized by accessory power supply 16 in the first operating mode is generally claimed
For doubler；This is real in the application, because the push-pull type of transistor N2 and N3
Run and make to assist the voltage negative between winding aux two and positive pulse substantially equal.
Under the second operational mode of accessory power supply 16, transistor N10 is deactivated, and diode
D11-D14 is used as full wave bridge rectifier, and this commutator is to the available AC between auxiliary winding aux two
Coupled voltages (E such as the coupling carried out by capacitor C1) carries out rectification.Due to auxiliary winding
Aux is AC coupling, diode D11-D14 the DC between the input of the bridge commutator formed
Current potential can with non-zero, and assume may occur in which between the two of capacitor C1 auxiliary winding aux two between can
Poor with the positive and negative peak of voltage.Therefore, diode D11-D14 the output of the bridge commutator formed
Can provide positive and negative peak pressure, this bridge commutator provides the defeated of accessory power supply 16 in the second operating mode
Go out, and this output is theoretically the half of the voltage produced in the first operating mode；But due to two poles
Pipe and other circuit pressure drops, two output voltages will differ from above-mentioned output voltage.
As it has been described above, after PFC14 runs or when dc-dc 15 enters routine
During operational mode, controller 10 can signal to accessory power supply 16, with away from doubler mould
Formula.Optional both operational modes of accessory power supply 16 are combined formation actuator.In Fig. 3
Accessory power supply 16 illustrate this kind of actuator.By comparing accessory power supply output voltage VAUX
With threshold voltage VTH, the hysteresis comparator K1 in control circuit 24 can control transistor
The door of N10, and generally by this threshold voltage VTHIt is set as running with second in the first operational mode
The accessory power supply output voltage V of patternAUXBetween any voltage.By defeated according to accessory power supply
Go out voltage VAUXSize control accessory power supply operational mode, described operation can be by accessory power supply
Output voltage VAUXIt is adjusted to aspiration level.
Fig. 4 explanation starts or the operation conditions of dc-dc 15 during dimmed pattern.
Start moment TABefore, voltage VLINKRise to the peak pressure of input line, and do not start switching
Operation.At moment TAWith TBBetween, the transfers pattern of dc-dc 15 is by narrow
And few pulse (such as occurring the pulse of 2.5 μ s every 50 μ s) is to output voltage VAUXFill
Electricity.At moment TBAfterwards, start regular run mode, wherein cut with normal switching rate
Change, such as, carry out every 10 μ s.Same at moment TAWith TBBetween, due to PFC14's
Run, voltage VLINKRaise.
Fig. 5 shows the accessory power supply 16 operation conditions when starting in delayed regulation.Signal mode
Formula shows the door state of transistor N10.At moment T0With moment TABetween, by supply voltage
VDDHThe required drive of the switch controller 10 represented is by resistor RS1And resistor
RS2There is provided, and the output voltage V of accessory power supplyAUXIt is shown as zero.In reality is implemented, auxiliary
Helping power supply to export can not be with resistor RS1With resistor RS2Separate, and such as voltage VDDHShown in
Can increase.From moment TATo moment TB, when the transfers of dc-dc 15 runs
When the capacitor C2 of the output at accessory power supply 16 is charged by the pulse of pattern, accessory power supply 16
It is maintained under first " multiplexer " operational mode, and accessory power supply output voltage VAUXRise step by step
High.At moment TBTime, output voltage VAUXReach threshold voltage VTHPlus comparator K1
Lagging voltage, i.e. maximum voltage Vmax；And the output of hysteresis comparator K1 changes, with
Select the full-wave bridge operational mode of accessory power supply 16.Output voltage VAUXReduce, until the moment
Threshold voltage V is reached during TcTHVoltage deduct the lagging voltage of comparator K1, i.e. minimum electricity
Pressure Vmin；And the output of hysteresis comparator K1 changes, again to select accessory power supply 16
Multiplication operational mode.
Fig. 6 shows the details of the accessory power supply 16A described in alternative embodiment of the present invention, this auxiliary
Power supply 16A is optional for implementing the accessory power supply 16 in Fig. 1.Accessory power supply 16A and Fig. 3
In accessory power supply 16 be similar to, the difference that the most hereafter will only describe between them.At accessory power supply
In 16A, do not use by comparing output voltage VAUXWith threshold voltage VTHAnd the control obtained
Signal mode, but by using comparator K2 to compare link voltage VLINKWith another threshold value electricity
Pressure VTH2, determine the size of link voltage；Under this link voltage, can be by controlling control signal
The state of pattern, interrupts doubling of the output voltage to auxiliary winding aux.Threshold voltage VTH2Can
To be the same threshold voltage for determining the transfers pattern selecting dc-dc 15；
And comparator K2 could be for selecting the phase of transfers pattern on year-on-year basis together with control signal pattern
Relatively device and control signal；Or for selecting the transfers pattern of dc-dc 15 and auxiliary
The threshold voltage and the control signal that help the multiplication of voltage action of power supply 16A can be to separate.
Although having combined preferred embodiment to be particularly shown and illustrate the present invention, those skilled in the art can
It is understood by the spirit and scope without departing from the present invention, can obtain above-mentioned and other are in shape
Change in terms of formula and details.
Claims (30)
1. a concatenated power transducer, including:
First power switched circuit, its input couples with power supply, its output and intermediate node
Coupling；And
Second power switched circuit, its input couples with intermediate node, and its output provides institute
State the output of concatenated power transducer；Wherein said second power switched circuit includes for by institute
State what the input of the second power switched circuit coupled with the output of described first power switched circuit
Magnetic couplings element, and this magnetic couplings element have armature winding and auxiliary winding；Wherein institute
Stating the second power switched circuit and include control circuit, this control circuit determines at described intermediate node
Voltage whether less than conventional operation voltage, and described control circuit controls electricity in response to described
Road determines that the voltage at described intermediate node is less than conventional operation voltage, or in response to described control
Circuit processed effectively disables the output of described concatenated power transducer, makes described second power switched electricity
Road is run under transfers operational mode, and the routine stopping described second power switched circuit is cut
Change operation；Wherein under described transfers operational mode, be enough to the transmission of described auxiliary winding
The energy of described control circuit is run by described auxiliary winding,
Wherein, when described second power switched circuit is under described transfers operational mode
In the whole time period run, described first power switched circuit runs simultaneously and continues to regulate institute
State the voltage of intermediate node.
Concatenated power transducer the most according to claim 1, wherein in described concatenated power
During the starting of transducer, described control circuit runs institute under described transfers operational mode
State the second power switched circuit, before thus the voltage at described intermediate node reaches steady-state value
Accessory power supply outfan produce voltage, described accessory power supply have be coupled to described auxiliary around
The input of group.
Concatenated power transducer the most according to claim 1, wherein described for response disabling
The instruction of the output of concatenated power transducer, described control circuit runs mould at described transfers
Run described second power switched circuit under formula, at described auxiliary winding, thus produce voltage,
And at the output of described concatenated power transducer, do not produce sizable electric current.
Concatenated power transducer the most according to claim 3, wherein said concatenated power turns
Parallel operation is a kind of power supply for powering to light emitting diode illuminator, and wherein said instruction is one
Plant and described concatenated power transducer is placed in the instruction under dimmed state.
Concatenated power transducer the most according to claim 1, wherein at described transfers
Under operational mode, the first pulse recurrence frequency of described second power switched circuit is less than described
Second arteries and veins of described second power switched circuit during the conventional operation of the second power switched circuit
Rush repetition rate.
Concatenated power transducer the most according to claim 5, wherein at described transfers
Under operational mode, the fixed pulse width of described second power switched circuit is narrower than described second
The operation pulse width of described second power switched circuit during the conventional operation of power switched circuit
Degree.
Concatenated power transducer the most according to claim 5, wherein said second pulse weight
Complex frequency is greater than or equal to five times of described first pulse recurrence frequency.
Concatenated power transducer the most according to claim 1, wherein said power supply is a kind of
AC power supplies, wherein said first power switched circuit is a kind of power factor corrector, and its
Described in the second power switched circuit be a kind of dc-dc.
Concatenated power transducer the most according to claim 1, also includes accessory power supply electricity
Road, its input and described auxiliary winding coupled, and it has and is coupled to described control circuit
Auxiliary power output end is powered for described control circuit；Wherein said auxiliary power circuit
There is optional operational mode, wherein described under the first operational mode of described auxiliary power circuit
Auxiliary power circuit is operated under multiplexer operational mode, and the most described auxiliary
Power circuit is helped to be operated under non-multiplexer operational mode.
Concatenated power transducer the most according to claim 9, wherein according to described auxiliary
The size of the voltage of power output end selects the operational mode of described auxiliary power circuit, thus makes
Described auxiliary power circuit is used as lagging voltage actuator.
11. concatenated power transducers according to claim 9, wherein according to described centre
The size of voltage described at node selects the operational mode of described auxiliary power circuit.
12. 1 kinds control the method cascading power converter, wherein this concatenated power transducer bag
Including the first power switched circuit, the input of this circuit couples with power supply, its output and the second switching
The input coupling of power circuit, described method includes:
The voltage from described power supply is provided to the input of described second power switched circuit；
Determine that the medium voltage in the input of described second power switched circuit is less than routine fortune
Row voltage, maybe when instruction from the auxiliary of the magnetic couplings element of described second power switched circuit around
When the energy that group obtains is not enough to the control circuit running described concatenated power transducer, by stopping
The only conventional switchover operation of described second power switched circuit, effectively disables described concatenated power and turns
The output of parallel operation；
As the response that this instruction is made, under transfers operational mode, run described
Two power switched circuit, wherein be enough to run described control circuit by the transmission of described auxiliary winding
Energy；And
Produce accessory power supply output voltage, for the electricity by each end crossing over described auxiliary winding
Pressure runs one of the most described first power switched circuit or described second power switched circuit；
When described second power switched circuit run under described transfers operational mode whole
In the individual time period, described first power switched circuit runs simultaneously and continues to regulate described middle node
The voltage of point.
13. methods according to claim 12, wherein at described concatenated power transducer
During starting, described control circuit is run described second under described transfers operational mode and is cut
Change power circuit, before described medium voltage reaches steady-state value, thus produce described accessory power supply
Output voltage.
14. methods according to claim 12, also include:
Receive the instruction disabling the output of described concatenated power transducer；And
As the response to the instruction disabling the output of described concatenated power transducer, in described mental retardation
Run described second power switched circuit under transmission operational mode, thus produce described accessory power supply
Output voltage, and at the output of described concatenated power transducer, do not produce sizable electric current.
15. methods according to claim 12, wherein in described transfers operational mode
The described second power switched circuit of lower operation, to control cutting of described second power switched circuit
Change, so that described second power switched circuit has the first pulse recurrence frequency, wherein often
Described second power switched circuit is run, to control described second switching merit during rule operational mode
The switching of rate circuit, so that described second power switched circuit has the second pulse and repeats frequency
Rate, and wherein, described first pulse recurrence frequency is less than described second pulse recurrence frequency.
16. methods according to claim 12, wherein in described transfers operational mode
The described second power switched circuit of lower operation, also controls cutting of described second power switched circuit
Change, so that described second power switched circuit has the first fixing pulse width that narrows, and often
Run described second power switched circuit under rule operational mode, also control described second power switched
The switching of circuit, so that described second power switched circuit has the second fixing pulse width that narrows
Spend, and the wherein said first fixing pulse width that narrows is narrower than the described second fixing pulse width that narrows
Degree.
17. methods according to claim 15, wherein said second pulse recurrence frequency is high
In or equal to five times of described first pulse recurrence frequency.
18. methods according to claim 12, wherein said power supply is a kind of AC electricity
Source, wherein said first power switched circuit is a kind of power factor corrector, and wherein said
Second power switched circuit is a kind of dc-dc.
19. methods according to claim 12, are additionally included at described auxiliary winding and use
The auxiliary power circuit with optional operational mode controls described accessory power supply output voltage, wherein
Under the first operational mode of described auxiliary power circuit, described auxiliary power circuit is operated in again
Increasing under device operational mode, the most described auxiliary power circuit is operated in non-multiplication
Under device operational mode.
20. methods according to claim 19, also include exporting according to described accessory power supply
The size of voltage selects the operational mode of described auxiliary power circuit, thus by described accessory power supply
Circuit regulates described accessory power supply output voltage delayedly.
21. methods according to claim 19, also include according to described medium voltage is big
The operational mode of the described auxiliary power circuit of little selection.
22. methods according to claim 12, wherein said concatenated power transducer is one
Plant the power supply for powering to light emitting diode illuminator, and wherein reduce described illumination apparatus
The run duration of the concatenated power transducer under the dimmed state of intensity of illumination, passes in described mental retardation
Transport and under row mode, run described second power switched circuit.
23. 1 kinds, for controlling to cascade the integrated circuits of power converter, have input and defeated
Going out end, described integrated circuit includes:
For running the first ON-OFF control circuit of power factor converter, this power factor is changed
Device produces D/C voltage from the AC power supplies being coupled to described input at intermediate node；
For running the second switch control circuit of dc-dc, this DC-DC changes
Utensil has the input coupled with described intermediate node and is coupled to the output of described outfan；Wherein
Described dc-dc includes magnetic couplings element, and this magnetic couplings element has primary
Winding and auxiliary winding；Wherein said second switch control circuit includes that controller determines in institute
State the voltage at intermediate node whether less than conventional operation voltage, and described controller in response to
Described controller determines that the voltage at described intermediate node is less than conventional operation voltage, or response
Effectively disable described outfan in described controller, make described dc-dc pass in mental retardation
Transport and run under row mode, stop the conventional switchover operation of described dc-dc；Wherein
Under described transfers operational mode, be enough to run described control to the transmission of described auxiliary winding
The energy of device；And
Run described dc-dc when described second switch control circuit to transport at transfers
In the whole time period run under row mode, described first ON-OFF control circuit runs described power
Run simultaneously and continue to regulate the voltage of described intermediate node because of number converter.
24. integrated circuits according to claim 23, wherein run at described transfers
Under pattern, the first pulse recurrence frequency of described dc-dc is less than turning at described DC-DC
Second pulse recurrence frequency of described dc-dc during the conventional operation of parallel operation.
25. integrated circuits according to claim 24, wherein run at described transfers
Under pattern, the fixing pulse width that narrows of described dc-dc is narrower than at described DC-DC
The operation pulse width of described dc-dc during the conventional operation of transducer.
26. integrated circuits according to claim 24, wherein said second pulse repeats frequency
Rate is greater than or equal to five times of described first pulse recurrence frequency.
27. integrated circuits according to claim 23, also include having optional operation mould
The auxiliary power circuit of formula, and the input of this auxiliary power circuit and described auxiliary winding coupling
Closing, the outfan of this auxiliary power circuit is coupled to described controller for supplying to described controller
Electricity；Wherein described auxiliary power circuit work under the first operational mode of described auxiliary power circuit
Make under multiplexer operational mode, when the described auxiliary power circuit institute of time in the second operating mode
State auxiliary power circuit to be operated under non-multiplexer operational mode.
28. integrated circuits according to claim 27, wherein according to described accessory power supply electricity
The size of the voltage of the outfan on road selects the operational mode of described auxiliary power circuit, thus makes
Described auxiliary power circuit is used as lagging voltage actuator.
29. integrated circuits according to claim 23, wherein said concatenated power transducer
It is a kind of power supply for powering to light emitting diode illuminator, and is wherein reducing described illumination
The run duration of the concatenated power transducer under the dimmed state of the intensity of illumination of device, described low
Can transmit and under operational mode, run described dc-dc.
30. 1 kinds of concatenated power transducers, including:
Multiple power switched levels being coupled with cascade form, are wherein carried by input power
For the input of first in the plurality of power switched level；
Have and the accessory power supply of accessory power supply input of auxiliary winding coupled, this auxiliary around
Group is positioned in the plurality of power switched level on the magnetic couplings element of second, wherein said many
The input of second in individual power switched level has medium voltage；And
Control circuit, for running the plurality of power switched under transfers operational mode
At least one in Ji described second, and its pulse width or switching rate is less than described
Another switching rate or another of the regular run mode of second described in multiple power switched levels
One pulse width；Wherein said control circuit determines whether described medium voltage reaches to be enough to run
In described power switched level second, and wherein start described in described power switched level
After first and in response to determine reach to be enough to run at described medium voltage described in cut
Changing the level of described second of power stage, described control circuit is under described regular run mode
Run described concatenated power transducer；
When in the plurality of power switched level described second under transfers operational mode
In the whole time period run, described first in the plurality of power switched level is run simultaneously
And continue to regulate the voltage of described intermediate node.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/495,720 | 2009-06-30 | ||
| US12/495,720 US8212493B2 (en) | 2009-06-30 | 2009-06-30 | Low energy transfer mode for auxiliary power supply operation in a cascaded switching power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101938219A CN101938219A (en) | 2011-01-05 |
| CN101938219B true CN101938219B (en) | 2016-12-14 |
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