CN100411287C - Lift type voltage converter - Google Patents
Lift type voltage converter Download PDFInfo
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- CN100411287C CN100411287C CNB2005100786250A CN200510078625A CN100411287C CN 100411287 C CN100411287 C CN 100411287C CN B2005100786250 A CNB2005100786250 A CN B2005100786250A CN 200510078625 A CN200510078625 A CN 200510078625A CN 100411287 C CN100411287 C CN 100411287C
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Abstract
The present invention discloses a life type voltage converter, wherein an input switching unit selectively couples the first end of an inductor to input voltage and ground electric potential; an output switching unit selectivity couples the second end of the inductor to the output voltage and the ground electric potential. A first pulse generating circuit generates a first pulse signal having a first duty ratio which is modulated in response to the output voltage; a second pulse generating circuit generates a second pulse signal having a second duty ratio which is a fixed value between zero and one. When the first duty ratio is larger than a predetermined critical duty ratio, a mode control circuit makes one of the input switching unit and the output switching unit controlled by the first pulse signal and makes the other one of the input switching unit and the output switching unit controlled by the second pulse signal.
Description
Technical field
The present invention relates to a kind of dc-dc electric pressure converter, relate in particular to a kind of lift type voltage converter, make an input voltage convert an output voltage to, wherein this input voltage can greater than, equal or less than this output voltage.
Background technology
The dc-dc electric pressure converter can become an input voltage regulation one stable output voltage, and under the stable output voltage of this kind the needed electric current of the extraneous load of supply.Portable electric system miscellaneous, for example digital camera, laser disc player, notebook computer, with mobile phone or the like, all be equiped with suitable dc-dc electric pressure converter as its power source.These portable electric systems typical case goes up and uses battery as input voltage source, therefore under long-time continuous is used, is presented the phenomenon that reduces gradually by the output voltage that battery provided.In other words, use the initial stage at battery, the output voltage that the battery two ends provided is greater than the output voltage desiring to be adjusted to, but after continuing supplying energy after a while, the output voltage that battery provided will be more and more near the output voltage desiring to be adjusted to.At this moment, if DC-DC converter still can realize voltage conversion function effectively, then prolonged the useful life of battery.
Predictably, under the operation that continues, the output voltage that battery provided can continue to reduce, and becomes at last to be lower than the output voltage desiring to be adjusted to.Even in this case, if DC-DC converter still can be reached voltage conversion function effectively, then done most complete utilization for battery.
Therefore, people expect to have a kind of lift type voltage converter, and though input voltage be greater than, equal or less than in the situation of the output voltage desiring to be adjusted to, can both effectively input voltage be converted to the output voltage desiring to be adjusted to.
Summary of the invention
A purpose of the present invention is to provide a kind of lift type voltage converter, can convert an input voltage to an output voltage, and though this input voltage be greater than, equal or less than this output voltage.
According to an aspect of of the present present invention, a kind of lift type voltage converter is provided, comprise: one switches circuit, has an input switch unit, one first end to an input voltage and a ground potential in order to a selectively coupled inductance, and an output switch unit, in order to one second end to an output voltage of selectively coupled this inductance and this ground potential; One first pulse-generating circuit, in order to produce one first pulse signal, it has one first duty ratio, and this first duty ratio is modulation in response to this output voltage; One second pulse-generating circuit, in order to produce one second pulse signal, it has one second duty ratio, and this second duty ratio is one greater than 0 and less than 1 fixed value; An and mode control circuit, in order to control this commutation circuit: when this first duty ratio during less than a predetermined critical duty ratio, operate at least one simple pattern, make in this input switch unit and this output switch unit one be controlled by this first pulse signal, and another in this input switch unit and this output switch unit is maintained at a fixing couple state, and when this first duty ratio during greater than a predetermined critical duty ratio, operate at least one boundary pattern, make in this input switch unit and this output switch unit one be controlled, and in this input switch unit and this output switch unit another controlled by this second pulse signal by this first pulse signal.
This at least one simple pattern has a simple decompression mode and a simple boost mode.In simple decompression mode, the input switch unit is controlled by first pulse signal, and the output switch unit is maintained at second end of fixed coupling inductance to output voltage.In simple boost mode, the output switch unit is controlled by first pulse signal, and the input switch unit is maintained at first end of fixed coupling inductance to input voltage.
This at least one boundary pattern has a boundary decompression mode and a boundary boost mode.In the decompression mode of boundary, the input switch unit is controlled by first pulse signal, and the output switch unit is controlled by second pulse signal.In the boost mode of boundary, the output switch unit is controlled by first pulse signal, and the input switch unit is controlled by second pulse signal.
According to another aspect of the present invention, a kind of method of changing voltage is provided, be applied to one and switch circuit, this commutation circuit has an input switch unit, one first end to an input voltage and a ground potential in order to a selectively coupled inductance, and one output switch unit, one second end to an output voltage and this ground potential in order to selectively coupled this inductance, this method comprises: produce one first pulse signal, it has one first duty ratio, and this first duty ratio is modulation in response to this output voltage; Produce one second pulse signal, it has one second duty ratio, and this second duty ratio is one greater than 0 and less than 1 fixed value; Monitor this first duty ratio of this first pulse signal; And when this first duty ratio during greater than a predetermined critical duty ratio, in this input switch unit and this output switch unit one is controlled by this first pulse signal, and in this input switch unit and this output switch unit another controlled by this second pulse signal.
Description of drawings
Fig. 1 shows the circuit diagram according to first example of lift type voltage converter of the present invention;
Fig. 2 shows the schematic diagram according to the method for operation of lift type voltage converter of the present invention;
Fig. 3 (A) shows the time sequential routine figure according to simple decompression mode of the present invention;
Fig. 3 (B) shows the time sequential routine figure according to boundary of the present invention decompression mode;
Fig. 3 (C) shows the time sequential routine figure according to boundary of the present invention boost mode;
Fig. 3 (D) shows the time sequential routine figure according to simple boost mode of the present invention;
Fig. 4 shows the circuit diagram according to duty ratio observation circuit of the present invention;
Fig. 5 shows the state diagram according to mode selection circuit of the present invention;
Fig. 6 shows the detailed circuit diagram according to drive logic of the present invention;
Fig. 7 (A) shows the circuit diagram according to second example of lift type voltage converter of the present invention; And
Fig. 7 (B) shows the circuit diagram according to the 3rd example of lift type voltage converter of the present invention.
The main element symbol description
10 synchronous commutation circuit 11 control switching circuits
20 modulation pulse-generating circuits, 21 voltage feedback circuits
22 difference amplifying circuits, 23 transmission control circuits
24 comparison circuits, 25 oscillating circuits
30 fixed pulses produce circuit 40 duty ratio observation circuits
41 simple/boundary judging unit 42 buck/boost judging units
50 mode selection circuits, 60 drive logic
61～66 gates, 71,72 asynchronous commutation circuits
80 mode control circuit L inductance
La, the two ends S1～S4 switch unit of Lb inductance
DS duty ratio monitor signal D1 first judges signal
D2 second judges signal MS mode select signal
M1 first selects signal M2 second to select signal
P1～P4 drive signal MP modulation pulse signal
D
MPThe duty ratio of modulation pulse signal
FP fixed pulse signal D
FPThe duty ratio of fixed pulse signal
D
Th, D
Th (H), D
Th (L)Critical duty ratio OSC oscillator signal
V
Err1, V
Err2Error signal V
InInput voltage
V
OutOutput voltage V
FbVoltage feedback signal
V
RefReference voltage X2, the X3 diode
Embodiment
Explanation hereinafter and accompanying drawing will make aforementioned and other purposes of the present invention, feature, more obvious with advantage.Describe in detail according to preferred embodiment of the present invention now with reference to accompanying drawing.
Fig. 1 shows the circuit diagram according to first example of lift type voltage converter of the present invention.Lift type voltage converter is in order to change an input voltage V
InBecome an output voltage V
Out, input voltage V wherein
InCan greater than, equal or less than output voltage V
OutWith reference to Fig. 1, the lift type voltage converter of first example comprises a synchronous commutation circuit 10 and and switches control circuit 11.
Commutation circuit 10 has an input switch unit and an output switch unit synchronously.Particularly, the input switch unit is made of the first switch unit S1 and the second switch unit S2, and the output switch unit is made of the 3rd switch unit S3 and the 4th switch unit S4.The first switch unit S1 is arranged at input voltage V
InAnd between the first end La of inductance L.The second switch unit S2 is arranged between the first end La and ground potential of inductance L.The 3rd switch unit S3 is arranged at second end Lb and the output voltage V of inductance L
OutBetween.The 4th switch unit S4 is arranged between the second end Lb and ground potential of inductance L.Switch unit S1 to S4 is implemented by N NMOS N-channel MOS N (NMOS), p NMOS N-channel MOS N (PMOS) or other controllable switch element.In the explanation hereinafter, suppose that switch unit S1 to S4 is all implemented (NMOS) by the N NMOS N-channel MOS N.
Fig. 2 shows the schematic diagram according to the method for operation of lift type voltage converter of the present invention.With reference to Fig. 2, optionally operate in a simple decompression mode, a boundary decompression mode, a boundary boost mode and a simple boost mode according to lift type voltage converter of the present invention.Simple decompression mode and boundary decompression mode all are applied to as input voltage V
InGreater than output voltage V
OutSituation, the applied input voltage V of the decompression mode that wherein has a common boundary
InRelatively near output voltage V
OutOr rather, simple decompression mode is applied to the duty ratio D of modulation pulse signal MP
MPBetween zero and one predetermined critical duty ratio D
ThBetween, the boundary decompression mode then is applied to the duty ratio D of modulation pulse signal MP
MPBetween critical duty ratio D
ThAnd between 1.Simple boost mode and boundary boost mode all are applied to as input voltage V
InLess than output voltage V
OutSituation, the applied input voltage V of the boost mode that wherein has a common boundary
InRelatively near output voltage V
OutOr rather, simple boost mode is applied to the duty ratio D of modulation pulse signal MP
MPBetween zero and critical duty ratio D
ThBetween, the boundary boost mode then is applied to the duty ratio D of modulation pulse signal MP
MPBetween critical duty ratio D
ThAnd between 1.
In simple decompression mode, shown in Fig. 3 (A), the first drive signal P1 sets for and is same as modulation pulse signal MP, the second drive signal P2 and sets anti-phase setting in the first drive signal P1, the 3rd drive signal P3 for and be maintained at the moving signal P4 of high level H and 4 wheel driven and set for anti-phase in the 3rd drive signal P3 (that is being maintained at low level L).In response to first and second drive signal P1 and P2, first and second switch unit S1 and S2 synchronized with each other but carry out the operation of ON/OFF anti-phasely, makes the first end La of inductance L alternately be coupled to input voltage V
InWith ground potential.Yet the 3rd switch unit S3 is maintained at the ON state and the 4th switch unit S4 is maintained at the OFF state, makes the second end Lb of inductance L be maintained at and be coupled to output voltage V
OutStationary state.Therefore, be same as the operation of existing buck electric pressure converter according to simple decompression mode of the present invention, and satisfy relational expression (V
Out/ V
In)=D
MP
Along with input voltage V
InReduction, the duty ratio D of modulation pulse signal MP
MPMust improve to keep fixing output voltage V
OutAs duty ratio D
MPSurpass a predetermined critical duty ratio D
ThThe time, the operation of foundation lift type voltage converter of the present invention will change over the boundary decompression mode from simple decompression mode.
In the decompression mode of boundary, shown in Fig. 3 (B), the first drive signal P1 sets for and is same as modulation pulse signal MP, the second drive signal P2 and sets anti-phase the setting in the first drive signal P1, the 3rd drive signal P3 for and anti-phasely set for anti-phase in the 3rd drive signal P3 in fixed pulse signal FP and the moving signal P4 of 4 wheel driven.Therefore, the boundary decompression mode is different from simple decompression mode part and is: for the decompression mode of boundary, the the 3rd and the 4th switch unit S3 and S4 synchronized with each other but carry out the operation of ON/OFF anti-phasely, makes the second end Lb of inductance L alternately be coupled to output voltage V
OutWith ground potential.Please note: the ON/OFF switching duty cycle of the 3rd and the 4th switch unit S3 and S4 can't be along with output voltage V
OutAnd modulation, because the duty ratio D of fixed pulse signal FP
FPImmobilize.
In case input voltage V
InContinue to reduce and cause the duty ratio D of modulation pulse signal MP
MPBe increased to maximum, promptly one, then the operation according to lift type voltage converter of the present invention will change over the boundary boost mode from the boundary decompression mode.
In the boost mode of boundary, shown in Fig. 3 (C), the first drive signal P1 sets and anti-phasely to set anti-phase setting in the first drive signal P1, the 3rd drive signal P3 in fixed pulse signal FP, the second drive signal P2 and be same as modulation pulse signal MP and the moving signal P4 of 4 wheel driven sets for anti-phase in the 3rd drive signal P3.In response to first and second drive signal P1 and P2, first and second switch unit S1 and S2 synchronized with each other but carry out the operation of ON/OFF anti-phasely, makes the first end La of inductance L alternately be coupled to input voltage V
InWith ground potential.Please note: the ON/OFF switching duty cycle of first and second switch unit S1 and S2 can't be along with output voltage V
OutAnd modulation, because the duty ratio D of fixed pulse signal FP
FPImmobilize.On the other hand, in response to the 3rd and moving signal P3 of 4 wheel driven and P4, the 3rd and the 4th switch unit S3 and S4 synchronized with each other but carry out the operation of ON/OFF anti-phasely, makes the second end Lb of inductance L alternately be coupled to output voltage V
OutWith ground potential.Please note: the ON/OFF switching duty cycle system of the 3rd and the 4th switch unit S3 and S4 is along with output voltage V
OutAnd modulation.
Along with input voltage V
InReduction, the duty ratio D of modulation pulse signal MP
MPMust reduce to keep fixing output voltage V
OutAs duty ratio D
MPSubcritical duty ratio D
ThThe time, the operation of foundation lift type voltage converter of the present invention changes over simple boost mode from the boundary boost mode.
In simple boost mode, shown in Fig. 3 (D), the first drive signal P1 sets for and is maintained at high level H, the second drive signal P2 and sets anti-phase setting in the first drive signal P1 (promptly being maintained at low level L), the 3rd drive signal P3 for and be same as the moving signal P4 of modulation pulse signal MP and 4 wheel driven and set for anti-phase in the 3rd drive signal P3.Therefore, simple boost mode is different from boundary boost mode part and is that the first switch unit S 1 is maintained at the ON state and the second switch unit S2 is maintained at the OFF state, makes the first end La of inductance L be maintained at and is coupled to input voltage V
InStationary state.Be same as the operation of existing pressure boosting type electric voltage converter according to simple boost mode of the present invention, and satisfy relational expression (V
Ou/ V
In)=1/ (1-D
MP).
In order to prevent to operate in duty ratio D at lift type voltage converter
MPNear critical duty ratio D
ThSituation in, owing to slight disturbance triggers conversion between simple pattern and boundary pattern, cause integrated circuit system operation instability, critical duty ratio D
ThMust be designed to have hysteresis function (Hysteresis).Particularly, critical duty ratio D
ThHas a high value D
Th (H), for example 0.95, and one than low value D
Th (L), for example 0.85.The duty ratio D of modulation pulse signal MP
MPMust surpass higher critical duty ratio D
Th (H), the operation that could trigger lift type voltage converter changes over the boundary pattern from simple pattern.Yet, if desire is returned simple pattern from the boundary pattern, the duty ratio D of modulation pulse signal MP
MPMust be reduced to less than lower critical duty ratio D
Th (L)Could the trigger mode conversion.
Refer back to Fig. 1, the concrete formation and the method for operation that will describe modulation pulse-generating circuit 20 now in detail are as follows.Modulation pulse-generating circuit 20 has a voltage feedback circuit 21, an error amplifying circuit 22, a transmission control circuit 23, a comparison circuit 24 and an oscillating circuit 25.
Voltage feedback circuit 21 is coupled in the output of synchronous commutation circuit 10, in order to produce a voltage feedback signal V
Fb, to represent output voltage V
OutFor example, voltage feedback circuit 21 must be implemented by the voltage divider that a plurality of series resistance constituted.
Error amplifying circuit 22 has an inverting input (-) and a non-inverting input (+).Inverting input is in order to receive voltage feedback signal V
Fb, non-inverting input is then in order to receive a predetermined reference voltage V
RefBased on voltage feedback signal V
FbWith reference voltage V
RefBetween comparison, error amplifying circuit 22 produces the first error signal V from noninverting output (+)
Err1And produce the second error signal V from reversed-phase output (-)
Err2The first error signal V
Err1With the second error signal V
Err2Variation tendency opposite each other.In other words, as voltage feedback signal V
FbDuring increase, the first error signal V
Err1Can diminish, however the second error signal V
Err2But become big.
Transmission control circuit 23 is arranged between error amplifying circuit 22 and the comparison circuit 24, and selectivity allows the first error signal V in order to the mode select signal MS of foundation mode selection circuit 50
Err1Or the second error signal V
Err2Be applied to comparison circuit 24.In simple decompression mode and boundary decompression mode, transmission control circuit 23 allows the first error signal V
Err1Be applied to comparison circuit 24.In simple boost mode and boundary boost mode, 23 of transmission control circuits allow the second error signal V
Err2Be applied to comparison circuit 24.Transmission control circuit 23 is made of existing controlled standard transmission gate, so locate to repeat no more.
Comparison circuit 24 has a non-inverting input (+) and an inverting input (-).Non-inverting input is in order to receive the first or second error signal V
Err1Or V
Err2, inverting input is then in order to receive the oscillator signal OSC that is produced by oscillating circuit 25.Based on the first or second error signal V
Err1Or V
Err2And the comparison between the oscillator signal OSC, comparison circuit 24 produces a modulation pulse signal MP, and it has the duty ratio D of a modulation
MPWith shown in 3 (B), in simple decompression mode and boundary decompression mode, modulation pulse signal MP is by the first error signal V as Fig. 3 (A)
Err1OSC determines with oscillator signal.Therefore, as voltage feedback signal V
Fb(represent output voltage V
Out) when increasing, the first error signal V
Err1Diminish, make the duty ratio D of modulation pulse signal MP
MPDiminish and reduce output voltage V with attempt
OutWith shown in 3 (D), in boundary boost mode and simple boost mode, modulation pulse signal MP is by the second error signal V as Fig. 3 (C)
Err2OSC determines with oscillator signal.Therefore, as voltage feedback signal V
Fb(represent output voltage V
Out) when increasing, the second error signal V
Err1Become big, make the duty ratio D of modulation pulse signal MP
MPBecome greatly and reduce output voltage V with attempt
Out
With reference to Fig. 4, duty ratio observation circuit 40 has a simple/boundary judging unit 41 and a buck/boost judging unit 42.Merely/boundary judging unit 41 is in order to judge the duty ratio D of modulation pulse signal MP
MPWhether less than critical duty ratio D
ThAs duty ratio D
MPLess than critical duty ratio D
ThThe time, first judges that signal D1 is in high level H.As duty ratio D
MPGreater than critical duty ratio D
ThThe time, the first judgement signal D1 then transition is low level L.Buck/boost judging unit 42 usefulness are judged the duty ratio D of modulation pulse signal MP
MPWhether surpass 1.As duty ratio D
MPLess than 1 o'clock, second judged that signal D1 is in low level L.As duty ratio D
MPGreater than 1 o'clock, the second judgement signal D1 then transition was high level H.In one embodiment, the duty ratio monitor signal DS of duty ratio observation circuit 40 judges that by first and second signal D1 and D2 are constituted jointly.
With reference to Fig. 5, mode selection circuit 50 is implemented by a finite state machine (Finite StateMachine).Mode select signal MS selects signal M1 and second to select signal M2 to be combined by first.First and second selects signal M1 and M2 all is the binary signal with high level H and low level L.Therefore, mode select signal MS has four kinds of possible combinations, can be in order to select four kinds of operator schemes shown in Figure 2 respectively.Particularly, state (M1, M2)=(L, L) in order to select simple decompression mode, state (M1, M2)=(L is H) in order to select boundary decompression mode, state (M1, M2)=(H, L) in order to select boundary boost mode and state (M1, M2)=(H is H) in order to select simple decompression mode.Fig. 5 has also shown relevant state transition condition, and mode selection circuit 50 judges that in response to first and second signal D1 determines the operator scheme of institute's desire selection with D2.
With reference to Fig. 6, based on first and second operator scheme of selecting signal M1 and M2 to set, drive logic 60 uses modulation pulse signal MP and fixed pulse signal FP to produce first to fourth drive signal P1 to P4.When mode select signal MS be state (M1, M2)=(L, in the time of L), gate 62 stops that fixed pulse signal FP is applied to gate 63.As a result, first and second drive signal P1 and P2 by modulation pulse signal MP through gate 61 and 63 and produce.On the other hand, gate 64 stops that modulation pulse signal MP is applied to gate 66, and gate 65 stops that fixed pulse signal FP is applied to gate 66.As a result, the 3rd drive signal P3 is maintained at the moving signal P4 of high level H and 4 wheel driven and is maintained at low level L.Therefore, and state (M1, M2)=(L L) realizes the simple decompression mode shown in Fig. 3 (A) effectively.When mode select signal MS transition be state (M1, M2)=(L, in the time of H), the 3rd and the moving signal P3 of 4 wheel driven and P4 then by fixed pulse signal FP through gate 65 and 66 and produce.Therefore, and state (M1, M2)=(L H) realizes the boundary decompression mode shown in Fig. 3 (B) effectively.
When mode select signal MS be state (M1, M2)=(H, in the time of H), gate 65 stops that fixed pulse signal FP is applied to gate 66.As a result, the 3rd and the moving signal P3 of 4 wheel driven and P4 by modulation pulse signal MP through gate 64 and 66 and produce.On the other hand, gate 61 stops that modulation pulse signal MP is applied to gate 63, and gate 62 stops that fixed pulse signal FP is applied to gate 63.As a result, the first drive signal P1 is maintained at high level H and the second drive signal P2 is maintained at low level L.Therefore, and state (M1, M2)=(H H) realizes the simple boost mode shown in Fig. 3 (D) effectively.When mode select signal MS transition be state (M1, M2)=(H, in the time of L), first and second drive signal P1 and P2 then by fixed pulse signal FP through gate 62 and 63 and produce.Therefore, and state (M1, M2)=(L H) realizes the boundary boost mode shown in Fig. 3 (C) effectively.
Fig. 7 (A) shows the circuit diagram according to second example of lift type voltage converter of the present invention.Second example is different from the input switch unit that the first example part is the commutation circuit 71 of second example and all belongs to the circuit of asynchronous switching kenel with the output switch unit.Particularly, the second switch unit S2 in the input switch unit is replaced by diode X2, and the 3rd switch unit S3 in the output switch unit is replaced by diode X3.Control switching circuit 11 shown in Figure 1 also can be effectively applied to the asynchronous commutation circuit 71 of second example.Because diode X2 and X3 passive switch element, thus control switching circuit 11 need only provide respectively first and 4 wheel driven move signal P1 and P4 to control the first and the 4th switch unit S1 and S4.
Fig. 7 (B) shows the circuit diagram according to the 3rd example of lift type voltage converter of the present invention.The 3rd example is different from the commutation circuit 72 that the second example part is the 3rd example only will import the circuit that switch unit changes asynchronous switching kenel into.Particularly, the second switch unit S2 in the input switch unit is replaced by diode X2.Control switching circuit 11 shown in Figure 1 also can be effectively applied to the asynchronous commutation circuit 72 of the 3rd example.Because diode X2 passive switch element, thus control switching circuit 11 need only provide first, the 3rd respectively, with 4 wheel driven moving signal P1, P3, with P4 with control first, the 3rd, and the 4th switch unit S1, S3 and S4.Change the example of diode X3 into if please note the 3rd switch unit S3 that also can be effectively applied to only will to export in the commutation circuit switch unit according to control switching circuit 11 of the present invention.
Though the present invention is illustrated as illustration by means of preferred embodiment, should understand: the invention is not restricted to the embodiment that this is disclosed.On the contrary, this invention is intended to contain tangible for those of ordinary skills various modifications and similar configuration.Therefore, the scope of claim should be according to the widest annotation, and this type of is revised and similar configuration to contain all.
Claims (10)
1. lift type voltage converter comprises:
One switches circuit, has an input switch unit, in order to one first end to an input voltage and a ground potential of a selectively coupled inductance, and an output switch unit, in order to one second end to an output voltage and this ground potential of selectively coupled this inductance;
One first pulse-generating circuit, in order to produce one first pulse signal, it has one first duty ratio, and this first duty ratio is modulation in response to this output voltage;
One second pulse-generating circuit, in order to produce one second pulse signal, it has one second duty ratio, and this second duty ratio is one greater than 0 and less than 1 fixed value; And
One mode control circuit, in order to control this commutation circuit:
When this first duty ratio during less than a predetermined critical duty ratio, operate at least one simple pattern, make in this input switch unit and this output switch unit one be controlled by this first pulse signal, and another in this input switch unit and this output switch unit is maintained at a fixing couple state, and
When this first duty ratio during greater than a predetermined critical duty ratio, operate at least one boundary pattern, make in this input switch unit and this output switch unit one be controlled, and in this input switch unit and this output switch unit another controlled by this second pulse signal by this first pulse signal.
2. lift type voltage converter as claimed in claim 1, wherein:
This at least one simple pattern has:
One simple decompression mode makes this input switch unit be controlled by this first pulse signal, and this second end that this output switch unit is maintained at this inductance of fixed coupling is to this output voltage, and
One simple boost mode makes this output switch unit be controlled by this first pulse signal, and this input switch unit is maintained at this first end of this inductance of fixed coupling to this input voltage.
3. lift type voltage converter as claimed in claim 1, wherein:
This at least one boundary pattern has:
One boundary decompression mode makes this input switch unit be controlled by this first pulse signal, and this output switch unit controlled by this second pulse signal, and
One boundary boost mode make this output switch unit be controlled by this first pulse signal, and this input switch unit is controlled by this second pulse signal.
4. lift type voltage converter as claimed in claim 1, wherein:
This first pulse-generating circuit has:
One feedback circuit in order to produce a feedback signal, is represented this output voltage;
One error amplifying circuit is in order to according to this feedback signal and a predetermined reference voltage and produce one first error signal and one second error signal;
One transmission control circuit allows this first error signal and this second error signal to pass through in order to selectivity;
One oscillating circuit is in order to produce an oscillator signal; And
One comparison circuit, in order to produce this first pulse signal, wherein when this transmission control circuit allows this first error signal to pass through, this first pulse signal is by relatively this first error signal and this oscillator signal and produce, and when this transmission control circuit allow this second error signal by the time, this first pulse signal is produced by relatively this second error signal and this oscillator signal.
5. lift type voltage converter as claimed in claim 1, wherein:
This mode control circuit has:
One duty ratio observation circuit is in order to monitor this first duty ratio of this first pulse signal;
One mode selection circuit is in order to produce a mode select signal in response to this duty ratio observation circuit; And
One drive logic is applied to this commutation circuit in order to control this first pulse signal and this second pulse signal based on this mode select signal.
6. lift type voltage converter as claimed in claim 5, wherein:
This duty ratio observation circuit has:
One first judging unit is judged signal in order to produce one first, and it indicates this first duty ratio and whether surpasses a predetermined critical duty ratio, and
One second judging unit is judged signal in order to produce one second, and it indicates this first duty ratio and whether surpasses 1.
7. lift type voltage converter as claimed in claim 5, wherein:
This mode selection circuit is implemented by a finite state machine, carries out state transformation in response to this duty ratio observation circuit.
8. the method for a changing voltage, be applied to one and switch circuit, this commutation circuit has an input switch unit, one first end to an input voltage and a ground potential in order to a selectively coupled inductance, and one output switch unit, in order to one second end to an output voltage and this ground potential of selectively coupled this inductance, this method comprises:
Produce one first pulse signal, it has one first duty ratio, and this first duty ratio is modulation in response to this output voltage;
Produce one second pulse signal, it has one second duty ratio, and this second duty ratio is one greater than 0 and less than 1 fixed value;
Monitor this first duty ratio of this first pulse signal; And
When this first duty ratio during greater than a predetermined critical duty ratio, in this input switch unit and this output switch unit one is controlled by this first pulse signal, and in this input switch unit and this output switch unit another controlled by this second pulse signal.
9. the method for changing voltage as claimed in claim 8 also comprises:
When this first duty ratio during less than this predetermined critical duty ratio, in this input switch unit and this output switch unit one is controlled by this first pulse signal, and keep in this input switch unit and this output switch unit another in a fixing couple state.
10. the method for changing voltage as claimed in claim 8, wherein:
In about this first duty ratio this step less than this predetermined critical duty ratio, when this input switch unit is controlled by this first pulse signal, this output switch unit is maintained at this second end of this inductance of fixed coupling to this output voltage, and when this output switch unit was controlled by this first pulse signal, this input switch unit was maintained at this first end of this inductance of fixed coupling to this input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100786250A CN100411287C (en) | 2005-06-23 | 2005-06-23 | Lift type voltage converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100786250A CN100411287C (en) | 2005-06-23 | 2005-06-23 | Lift type voltage converter |
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| CN1885697A CN1885697A (en) | 2006-12-27 |
| CN100411287C true CN100411287C (en) | 2008-08-13 |
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| CNB2005100786250A Expired - Fee Related CN100411287C (en) | 2005-06-23 | 2005-06-23 | Lift type voltage converter |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7804283B2 (en) * | 2007-08-14 | 2010-09-28 | Freescale Semiconductor, Inc. | Mode transitioning in a DC/DC converter using a constant duty cycle difference |
| EP2912763B1 (en) * | 2012-10-25 | 2018-03-21 | Philips Lighting Holding B.V. | Buck/boost converter, controller, and method for providing power to controller by means of an auxiliary winding also during stand-by |
| CN104600983B (en) * | 2014-12-24 | 2017-07-18 | 成都芯源系统有限公司 | Step-up and step-down switch power converter, control circuit and mode switching control unit |
| CN110168892A (en) * | 2018-08-02 | 2019-08-23 | 深圳欣锐科技股份有限公司 | A kind of traditional direct current booster circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6166527A (en) * | 2000-03-27 | 2000-12-26 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency in a buck-boost switching regulator |
| US6191567B1 (en) * | 1999-05-04 | 2001-02-20 | U.S. Philips Corporation | DC-DC converter, with duty cycle comparison for a dual mode back boost converter |
| US20050093526A1 (en) * | 2003-10-29 | 2005-05-05 | Andrew Notman | Multi-mode switching regulator |
-
2005
- 2005-06-23 CN CNB2005100786250A patent/CN100411287C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6191567B1 (en) * | 1999-05-04 | 2001-02-20 | U.S. Philips Corporation | DC-DC converter, with duty cycle comparison for a dual mode back boost converter |
| US6166527A (en) * | 2000-03-27 | 2000-12-26 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency in a buck-boost switching regulator |
| US20050093526A1 (en) * | 2003-10-29 | 2005-05-05 | Andrew Notman | Multi-mode switching regulator |
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| CN1885697A (en) | 2006-12-27 |
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