CN104253532A - Power converter, power conversion system and power conversion method - Google Patents
Power converter, power conversion system and power conversion method Download PDFInfo
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- CN104253532A CN104253532A CN201310267787.3A CN201310267787A CN104253532A CN 104253532 A CN104253532 A CN 104253532A CN 201310267787 A CN201310267787 A CN 201310267787A CN 104253532 A CN104253532 A CN 104253532A
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Abstract
The invention discloses a power converter, a power conversion system and a power conversion method. The power converter comprises a conversion unit, a signal generating unit and a control unit. The conversion unit is used for outputting conversion power. The signal generating unit is used for receiving detecting signals and generating reference signals. The control unit is coupled with the conversion unit and the signal generating unit and used for receiving the reference signals and controlling the conversion unit according to the reference signals so as to adjust control load of the conversion unit. The control load is provided with a plurality of segments, each segment is provided with corresponding slope, and at least two of the segments are different in slope.
Description
Technical field
The invention relates to a kind of power converter, and relate to the power converter that its controlled variable a kind of has multiple part charge especially.
Background technology
Along with distributed power supply system constantly evolution, market increases day by day for the demand of the power converter of high efficiency, small size, low cost, highly compatible, high power density, high reliability and high switching frequency.
In the application of wide input voltage range, traditional power converter adopts constant output voltage design, but, the input voltage range of power supply is narrow in this type of design, cannot compatible multiple bus (bus) voltage, cause the compatibility of power supply not good, cannot reduce costs, use exists the shortcomings such as efficiency is low, cost is high, power compatibility is poor.Although the opened loop control design that another kind of conventional electric power converter adopts can improve efficiency, its shortcoming is then cannot provide a power supply had between areas of permanent pressure near the representative value of busbar voltage.
Comprehensively above-mentioned, unsolved demand is present in the art up to now, to solve aforementioned drawback with not enough.
Summary of the invention
The invention relates to a kind of power converter, power conversion system and electric power conversion method, in order to the controlled variable by having multiple part charge in converter unit, the efficiency of power converter being improved.
An aspect of of the present present invention is about a kind of power converter, and it comprises converter unit, signal generation unit and control unit.Converter unit is in order to output transform electric power.Signal generation unit, in order to receive detection signal, produces reference signal.Control unit couples converter unit and signal generation unit, in order to receive reference signal, and controls converter unit, to adjust a controlled variable of converter unit according to reference signal.Above-mentioned controlled variable has multiple part charge, and in above-mentioned multiple part charge, each has corresponding slope, and in above-mentioned multiple part charge, at least the slope of the two is different.
In one embodiment, above-mentioned controlled variable comprises at least one in input voltage, input current, output voltage and output current.
In one embodiment, above-mentioned detection signal produces corresponding at least one in input voltage, input current, output voltage and output current.
In one embodiment, reference signal has multiple part charge.
In one embodiment, signal generation unit is also in order to receive a Setting signal, and signal generation unit is in order to produce reference signal according to detection signal and Setting signal, and control unit is in order to control converter unit, to adjust the controlled variable of converter unit according to reference signal.
In one embodiment, in above-mentioned multiple part charge adjacent two part charges slope between angle be more than or equal to 90 degree.
In one embodiment, converter unit also comprises buffer circuit.
In one embodiment, converter unit also comprises resonant transform circuit.
In one embodiment, above-mentioned resonant transform circuit is LLC type resonant transform circuit.
In one embodiment, control unit controls converter unit, makes the frequency of operation of converter unit corresponding to multiple part charges change in oscillation in a frequency-tuning range of above-mentioned controlled variable.
In one embodiment, control unit controls converter unit, makes the duty ratio of converter unit corresponding to multiple part charges change in oscillation within the scope of a duty cycle adjustment of above-mentioned controlled variable.
Another aspect of the present invention is about a kind of electric power conversion method, and its step comprises: by converter unit output transform electric power; Receive a detection signal by a signal generation unit, produce a reference signal; And receive this reference signal by a control unit and control this converter unit according to this reference signal, in order to adjust the controlled variable of this converter unit.Above-mentioned controlled variable has multiple part charge, and in above-mentioned multiple part charge, each has corresponding slope, and in above-mentioned multiple part charge, at least the slope of the two is different.
In one embodiment, above-mentioned reference signal has multiple part charge.
In one embodiment, this detection signal is received by this signal generation unit, produce this reference signal, receive this reference signal by this control unit again and also comprise according to the step that this reference signal controls this converter unit: receiving a Setting signal by this signal generation unit, and produce this reference signal according to this detection signal and this Setting signal, this control unit in order to control this converter unit according to this reference signal, to adjust this controlled variable of this converter unit.
In one embodiment, in above-mentioned multiple part charge adjacent two part charges slope between angle be more than or equal to 90 degree.
Another aspect of the present invention is in a kind of power conversion system, and it comprises multiple power converter coupled in parallel.In power converter, each comprises converter unit, signal generation unit and control unit.Converter unit is in order to export a conversion electric power.Signal generation unit, in order to receive a detection signal, produces a reference signal.Control unit, couples this converter unit and this signal generation unit, in order to receive this reference signal, and controls this converter unit according to this reference signal, to adjust a controlled variable of this converter unit.Upper controlled variable has multiple part charge, and in described multiple part charge, each has corresponding slope, and in described multiple part charge, at least the slope of the two is different.
In one embodiment, above-mentioned reference signal has multiple part charge.
In one embodiment, signal generation unit is also in order to receive a Setting signal, this signal generation unit produces this reference signal according to this detection signal and this Setting signal, this control unit in order to control this converter unit according to this reference signal, to adjust this controlled variable of this converter unit.
Apply technology contents of the present invention, not only can promote power converter efficiency, can also cost be reduced, or the volume reduced under same cost needed for power converter or size.
Although the present invention discloses as above with execution mode; so itself and be not used to limit the present invention; anyly be familiar with this those skilled in the art; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, the scope that therefore protection scope of the present invention ought define depending on appending claims is as the criterion.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the power converter illustrated according to one embodiment of the invention;
Fig. 2 A ~ Fig. 2 D is the curve synoptic diagram of the relative change in detection signal of controlled variable illustrated according to one embodiment of the invention;
Fig. 3 A ~ Fig. 3 B is the curve synoptic diagram of the relative change in detection signal of controlled variable illustrated according to another embodiment of the present invention;
Fig. 4 A ~ Fig. 4 B is the curve synoptic diagram of the relative change in detection signal of controlled variable illustrated according to the present invention's time embodiment;
Fig. 5 A ~ Fig. 5 D is the curve synoptic diagram of the relative change in detection signal of controlled variable illustrated according to yet another embodiment of the invention;
Fig. 6 A ~ Fig. 6 D is the curve synoptic diagram of the relative change in detection signal of controlled variable illustrated according to another embodiment of the present invention;
Fig. 7 A ~ Fig. 7 B is the curve synoptic diagram of the relative change in detection signal of controlled variable illustrated according to the present invention's time embodiment;
Fig. 8 is the circuit diagram of the power converter illustrated according to another embodiment of the present invention;
Fig. 9 is the circuit diagram of the power converter illustrated according to the present invention's time embodiment;
Figure 10 is the circuit diagram of the converter unit illustrated according to one embodiment of the invention;
Figure 11 illustrates a kind of curve synoptic diagram applying the relative input voltage change of output voltage in the power converter shown in Fig. 1 when of the converter unit shown in Figure 10 according to the embodiment of the present invention;
Figure 12 illustrates a kind of curve synoptic diagram applying the relative input voltage change of frequency of operation in the power converter shown in Fig. 1 when of the converter unit shown in Figure 10 according to the embodiment of the present invention;
Figure 13 illustrates a kind of curve synoptic diagram applying the relative frequency of operation change of efficiency in the power converter shown in Fig. 1 when of the converter unit shown in Figure 10 according to the embodiment of the present invention;
Figure 14 is the circuit diagram of the converter unit illustrated according to another embodiment of the present invention;
Figure 15 illustrates a kind of curve synoptic diagram applying the relative input voltage change of output voltage in the power converter shown in Fig. 1 when of the converter unit shown in Figure 14 according to the embodiment of the present invention;
Figure 16 illustrates a kind of curve synoptic diagram applying the relative input voltage change of duty ratio in the power converter shown in Fig. 1 when of the converter unit shown in Figure 14 according to the embodiment of the present invention;
Figure 17 illustrates a kind of curve synoptic diagram applying the efficiency relative duty cycles change in the power converter shown in Fig. 1 when of the converter unit shown in Figure 14 according to the embodiment of the present invention;
Figure 18 is the circuit diagram of the power conversion system illustrated according to one embodiment of the invention;
Figure 19 A illustrates the circuit diagram that the power converter according to one embodiment of the invention connects with other power circuits;
Figure 19 B illustrates the circuit diagram that the power converter according to another embodiment of the present invention connects with other power circuits.
Embodiment
The present invention is presented below with reference to annexed drawings more fully at this, and wherein annexed drawings is painted with embodiments of the invention.But the present invention can realize in many different forms and should not be limited to the embodiment of this specification statement.On the contrary, propose these these specifications of embodiment military order detailed and complete, and usually know the knowledgeable by what give full expression to that the scope of the invention gives the technical field of the invention.Ref. No. identical herein means identical element.
This specification term used only for describing specific embodiment, and is not intended to as restriction of the present invention.Singulative, as " one ", " this " and " being somebody's turn to do ", as this specification is used, equally also comprises multi-form.More will be understood that, when term " comprise ", " comprising " or " having " in this specification by use time, it is the existence arranging institute's chern character, position, integer, step, operation, element and/or parts in detail, but does not get rid of other features, position, integer, step, operation, element, parts and/or the wherein existence of the one or more of group or interpolation.
Unless otherwise defined, all terms (comprising technology and scientific words) institute's tool meaning that this specification is used, with the technical field of the invention usually know that the usual understanding of the knowledgeable is identical.More will be understood that, such as be defined in the term in widely used dictionary, it is consistent with the term meaning in context in the present invention and correlation technique that term should be understood to have meaning, unless be clearly defined in this manual, otherwise should not lay down a definition with desirable or the excessive literal meaning.
About " first " used herein, " second " ... Deng, the not special meaning of censuring order or cis-position, is also not used to limit the present invention, and it is only used to distinguish the element or operation that describe with constructed term.
In addition, about " coupling " used herein or " connection ", all can refer to two or multiple element mutually directly make entity or in electrical contact, or mutually indirectly put into effect body or in electrical contact, also can refer to two or multiple element mutual operation or action.
Term as used in this specification, " about ", " approximately " or " being similar to " generally should mean within 20 percent of particular value or scope, better within 10, and the most suitable within 5 percent.Carried numerical value is approximation herein, even if be meant to clearly do not represented, and the meaning of its all implicit term " about ", " approximately " or " being similar to ".
Fig. 1 is the circuit diagram of the power converter illustrated according to one embodiment of the invention.As shown in Figure 1, power converter 100 comprises converter unit 120, signal generation unit 130 and control unit 140.Converter unit 120 is in order to output transform electric power (such as corresponding with output voltage Vo or output current Io conversion electric power).Signal generation unit 130 in order to receive a detection signal SD, and produces a reference signal SR.Control unit 140 couples with converter unit 120 and signal generation unit 130, and control unit 140 is in order to receive reference signal SR, and controls converter unit 120, to adjust the controlled variable of converter unit 120 according to reference signal SR.Aforementioned controlled measurer has multiple part charge, and in these part charges, each has corresponding slope, and in these part charges, at least the slope of the two is different.
In the present embodiment, converter unit 120 also can comprise at least one switching circuit Q1, and control unit 140 is according to reference signal SR correspondingly control switch circuit Q1, and the controlled variable of converter unit 120 is adjusted corresponding to the operation of switching circuit Q1.
In implementation, converter unit 120 comprises pulse width modulation converter, and this pulse width modulation converter can be the converter of the pattern such as full-bridge, half-bridge, flyback, forward, buck, boost, buck-boost.
In one embodiment, above-mentioned controlled variable comprises at least one in input voltage vin, input current Iin, output voltage Vo and output current Io; In other words, above-mentioned controlled variable can be input voltage vin, input current Iin, output voltage Vo and output current Io one of them or wherein count person.For example, above-mentioned controlled variable can be output voltage Vo, or also can comprise output voltage Vo and output current Io simultaneously, but not as limit.
Secondly, in one embodiment, detection signal SD produces corresponding at least one in input voltage vin, input current Iin, output voltage Vo and output current Io; In other words, above-mentioned detection signal SD can corresponding to input voltage vin, input current Iin, output voltage Vo and output current Io one of them or wherein count person and producing.For example, detection signal SD can correspondingly produce after detection output voltage Vo, or also can produce after detection output voltage Vo and output current Io, but not as limit.
In a secondary embodiment, reference signal SR has multiple part charge, makes control unit 140 can control converter unit 120 according to this and correspondingly adjusts aforementioned controlled amount.
Operationally, for the power converter 100 that Fig. 1 illustrates, converter unit 120 receives input electric power (such as: the input electric power corresponding with input voltage vin or input current Iin), and then converting above-mentioned input electric power is conversion electric power (such as: the conversion electric power corresponding with output voltage Vo or output current Io).
Moreover, for the control operation of converter unit 120, control unit 140 controls the switch element in converter unit 120 according to reference signal SR, at least one or whole part charges that the controlled variable of converter unit 120 is had corresponding to switch element operation and adjust.It should be noted that, aforementioned alleged controlled variable has multiple part charge, converter unit 120 can be referred to controlled and receive input voltage vin or the input current Iin of the different value of tool, or controlled and produce output voltage Vo or the output current Io of the different value of tool.
In one embodiment, the detection signal SD(that signal generation unit 130 produces by feedback control loop (Fig. 1 does not illustrate) is such as: the detection signal SD correspondingly produced after detecting output voltage Vo or output current Io) produce reference signal SR, and control unit 140 controls converter unit 120 according to reference signal SR, wherein one or more part charges of above-mentioned controlled variable are produced according to this.
In another embodiment, the detection signal SD(that signal generation unit 130 produces by feed forward control loop (Fig. 1 does not illustrate) is such as: the detection signal SD correspondingly produced after detecting input voltage vin or input current Iin) produce reference signal SR, and control unit 140 controls converter unit 120 according to reference signal SR, wherein one or more part charges of above-mentioned controlled variable are produced according to this.
In a secondary embodiment, signal generation unit 130 receives detection signal SD, produce reference signal SR, control unit 140 controls converter unit 120 by the operation of open loop (Fig. 1 does not illustrate) according to reference signal SR, and wherein one or more part charges of above-mentioned controlled variable are produced according to this.
As seen from the above embodiment, the controlled variable of converter unit 120 has the different multiple part charges of at least two slopes, can be applicable to (such as: feedback control loop, feed forward control loop and open loop) in the control loop of various control operation, make the design of power converter have larger elasticity.
Following examples describe the change of the relative detection signal SR of controlled variable of converter unit in power converter of the present invention.Please refer to Fig. 2 A ~ Fig. 2 D, Fig. 2 A ~ Fig. 2 D is the curve synoptic diagram of the relative detection signal SD change of controlled variable illustrated according to one embodiment of the invention, the controlled variable that wherein Fig. 2 A ~ Fig. 2 D illustrates can be applicable in the power converter of various embodiments of the invention with the relative variation pattern of detection signal, but not as limit.
In the present embodiment, in the controlled variable shown in Fig. 2 A ~ Fig. 2 D, each all has multiple part charge, and in these part charges, each has corresponding slope, and in these part charges, at least the slope of the two is different; For example, as in Fig. 2 A ~ Fig. 2 D any one illustrate, the slope of a part charge is constant zero, and the slope of another part charge be adjacent is non-zero steady state value.
As shown in Figure 2 A, the slope of the part charge SA1 of controlled variable is constant negative value, and the slope immediately preceding the part charge SA2 after part charge SA1 is constant zero.Moreover as shown in Figure 2 B, the slope of the part charge SA4 of controlled variable is constant negative value, but be constant zero immediately preceding the slope of the part charge SA3 before part charge SA4.Secondly, as shown in Figure 2 C, the slope of the part charge SA5 of controlled variable is constant positive value, and the slope immediately preceding the part charge SA6 after part charge SA5 is constant zero.In addition, as shown in Figure 2 D, the slope of the part charge SA8 of controlled variable is constant positive value, but is constant zero immediately preceding the slope of the part charge SA7 before part charge SA8.
In another embodiment, as shown in Fig. 2 A ~ Fig. 2 D any one, adjacent two part charge (as: SA1 and SA2, or SA3 and SA4 in the part charge of controlled variable, or SA5 and SA6, or SA7 and SA8) slope between angle (as: θ a, θ b, θ c or θ d) be greater than 90 degree.Thus, the change between part charge can be avoided too violent, export to obtain stable conversion electric power.
Fig. 3 A ~ Fig. 3 B is the curve synoptic diagram of the relative change in detection signal of controlled variable illustrated according to another embodiment of the present invention, wherein the controlled variable that illustrates of Fig. 3 A ~ Fig. 3 B and detection signal can be applicable in the power converter of various embodiments of the invention, but not as limit.
In the present embodiment, in the controlled variable shown in Fig. 3 A ~ Fig. 3 B, each all has multiple part charge, and in these part charges, each has corresponding slope, and in these part charges, at least the slope of the two is different; For example, as in Fig. 3 A ~ Fig. 3 B any one illustrate, the slope of a part charge is constant positive value, and the slope of another part charge be adjacent is constant negative value.
As shown in Figure 3A, the slope of the part charge SA1 of controlled variable is constant negative value, and the slope immediately preceding the part charge SA2 after part charge SA1 is constant positive value.Moreover as shown in Figure 3 B, the slope of the part charge SA4 of controlled variable is constant negative value, but be constant positive value immediately preceding the slope of the part charge SA3 before part charge SA4.
In another embodiment, as shown in Fig. 3 A ~ Fig. 3 B any one, in the part charge of controlled variable adjacent two part charges (as: SA1 and SA2, or SA3 and SA4) slope between angle (as: θ a or θ b) be greater than 90 degree.Thus, the change between part charge can be avoided too violent, export to obtain stable conversion electric power, however have in the art usually know that the knowledgeable can realize adjacent two part charges according to actual demand slope between angle be less than or equal to 90 degree, and not to be limited with the present embodiment.
Fig. 4 A ~ Fig. 4 B is the curve synoptic diagram of the relative detection signal SD change of controlled variable illustrated according to the present invention's time embodiment, wherein the controlled variable that illustrates of Fig. 4 A ~ Fig. 4 B and detection signal can be applicable in the power converter of various embodiments of the invention, but not as limit.
In the present embodiment, in the controlled variable shown in Fig. 4 A ~ Fig. 4 B, each all has multiple part charge, and in these part charges, each has corresponding slope, and in these part charges, at least the slope of the two is different; For example, as in Fig. 4 A ~ Fig. 4 B any one illustrate, two adjacent part charges are steady state value, and both values are different.As shown in Figure 4 A, part charge SA1 and the SA3 of controlled variable is steady state value, and the value of SA3 is greater than the value of SA1.Moreover as shown in Figure 4 B, part charge SA4 and the SA6 of controlled variable is steady state value, and the value of SA4 is greater than the value of SA6.
Fig. 5 A ~ Fig. 5 D is the curve synoptic diagram of the relative detection signal SD change of controlled variable illustrated according to yet another embodiment of the invention, wherein the controlled variable that illustrates of Fig. 5 A ~ Fig. 5 D and detection signal SR can be applicable in the power converter of various embodiments of the invention, but not as limit.
In the present embodiment, in the controlled variable shown in Fig. 5 A ~ Fig. 5 D, each all has multiple part charge, and different part charge has different slopes.For example, as in Fig. 5 A ~ Fig. 5 D any one illustrate, the slope of a part charge be non-constant on the occasion of or non-constant negative value, the slope of another part charge be adjacent is constant zero.
As shown in Figure 5A, the slope of the part charge SA1 of controlled variable is constant zero, the slope immediately preceding the part charge SA2 after part charge SA1 be non-constant on the occasion of.Moreover as shown in Figure 5 B, the slope of the part charge SA3 of controlled variable is constant zero, but be non-constant negative value immediately preceding the slope of the part charge SA4 after part charge SA3.Secondly, as shown in Figure 5 C, the slope of the part charge SA6 of controlled variable is constant zero, the slope immediately preceding the part charge SA5 before part charge SA6 be non-constant on the occasion of.In addition, as shown in Figure 5 D, the slope of the part charge SA8 of controlled variable is constant zero, but is non-constant negative value immediately preceding the slope of the part charge SA7 before part charge SA8.
In addition, as shown in Fig. 5 A ~ Fig. 5 D any one, adjacent two part charge (as: SA1 and SA2, or SA3 and SA4 in the part charge of controlled variable, or SA5 and SA6, or SA7 and SA8) slope between angle (as: θ a, θ b, θ c or θ d) be greater than 90 degree.
Fig. 6 A ~ Fig. 6 D is the curve synoptic diagram of the relative detection signal SD change of controlled variable illustrated according to another embodiment of the present invention, wherein the controlled variable that illustrates of Fig. 6 A ~ Fig. 6 D and detection signal SD can be applicable in the power converter of various embodiments of the invention, but not as limit.
In the present embodiment, in the controlled variable shown in Fig. 6 A ~ Fig. 6 D, each all has multiple part charge, and in these part charges, each has corresponding slope, and in these part charges, at least the slope of the two is different; For example, as Fig. 6 A ~ Fig. 6 D illustrate, the slope of a part charge is constant positive value or constant negative value, the slope of another part charge be adjacent be non-constant negative value or non-constant on the occasion of.
As shown in Figure 6A, the slope of the part charge SA1 of controlled variable be non-constant on the occasion of, the slope immediately preceding the part charge SA2 after part charge SA1 is constant negative value.Moreover as shown in Figure 6B, the slope of the part charge SA3 of controlled variable is constant negative value, however immediately preceding the slope of the part charge SA4 after part charge SA3 be non-constant on the occasion of.Secondly, as shown in Figure 6 C, the slope of the part charge SA5 of controlled variable is constant positive value, and the slope immediately preceding the part charge SA6 after part charge SA5 is non-constant negative value.In addition, as shown in Figure 6 D, the slope of the part charge SA8 of controlled variable is constant positive value, but is non-constant negative value immediately preceding the slope of the part charge SA7 before part charge SA8.
In addition, as shown in Fig. 6 A ~ Fig. 6 D any one, adjacent two part charge (as: SA1 and SA2 in the part charge of controlled variable, or SA3 and SA4, or SA5 and SA6, or SA7 and SA8) slope between angle (as: θ a, θ b, θ c or θ d) 90 degree can be greater than, avoid change between part charge too violent, export to obtain stable conversion electric power.But have in the art usually know that the knowledgeable can realize adjacent two part charges according to actual demand slope between angle be equal to or less than 90 degree, and not to be limited with the present embodiment.
Fig. 7 A ~ Fig. 7 B is the curve synoptic diagram of the relative detection signal SD change of controlled variable illustrated according to the present invention's time embodiment, wherein the controlled variable that illustrates of Fig. 7 A ~ Fig. 7 B and detection signal SD can be applicable in the power converter of various embodiments of the invention, but not as limit.
In the present embodiment, in the controlled variable shown in Fig. 7 A ~ Fig. 7 B, each all has multiple part charge, and in these part charges, each has corresponding slope, and in these part charges, at least the slope of the two is different; For example, as in Fig. 7 A ~ Fig. 7 B any one illustrate, the slope of a part charge be non-constant on the occasion of, the slope of another part charge be adjacent is non-constant negative value.
As shown in Figure 7 A, the slope of the part charge SA1 of controlled variable is non-constant negative value, the slope immediately preceding the part charge SA2 after part charge SA1 be non-constant on the occasion of.Moreover as shown in Figure 7 B, the slope of the part charge SA4 of controlled variable is non-constant negative value, however immediately preceding the slope of the part charge SA3 before part charge SA4 be non-constant on the occasion of.
In addition, as shown in Fig. 7 A ~ Fig. 7 B, in the part charge of controlled variable adjacent two part charges (as: SA1 and SA2, or SA3 and SA4) slope between angle (as: θ a or θ b) be greater than 90 degree.But have in the art usually know that the knowledgeable can realize adjacent two part charges according to actual demand slope between angle be equal to or less than 90 degree, and not to be limited with the present embodiment.
From the embodiment shown in Fig. 2 A ~ Fig. 7 B, the controlled variable of the converter unit 120 shown in Fig. 1 has multiple part charges (except the situation of Fig. 4) that at least the two slope is different, and power converter 100 can the combination of various part charge or various part charge in application drawing 2A ~ Fig. 7 B illustrated embodiment, makes the operation of power converter 100 have more elasticity.
The embodiment of above Fig. 2 A to Fig. 7 B is the change of the relative detection signal SD of part charge in order to describe controlled variable of the present invention, but above embodiment and be not used to limit the present invention, in other words, have in the art and usually know the knowledgeable, part charge in above embodiment can be combined or change, so as to realizing power converter of the present invention for actual demand according to spirit of the present invention.
Fig. 8 is the circuit diagram of the power converter illustrated according to another embodiment of the present invention.Power converter 200 comprises converter unit 220, signal generation unit 230 and control unit 240 equally.Compared to Fig. 1, converter unit 220 also comprises buffer circuit 223, and wherein buffer circuit 223 can comprise an isolating transformer.
Fig. 9 is the circuit diagram of the power converter illustrated according to the present invention's time embodiment.Power converter 300 comprises converter unit 320, signal generation unit 330 and control unit 340 equally.Compared to Fig. 8, signal generation unit 330 also in order to receive Setting signal SG, and produces corresponding reference signal SR in order to foundation detection signal SD and Setting signal SG.Control unit 340 controls converter unit 320, to adjust the controlled variable of converter unit 320 according to corresponding reference signal SR.
Operationally, control unit 340 controls switching circuit Q1a, Q1b of converter unit 320 according to reference signal SR, the controlled variable of converter unit 320 is adjusted by the operation of switching circuit Q1a, Q1b, wherein the controlled variable of converter unit 320 has multiple part charge, and each has corresponding slope in part charge, in above-mentioned part charge, at least the slope of the two is different.
Embodiment is as shown in Figure 9 known, and Setting signal SG can be incorporated in the design of power converter, makes the design of power converter have more elasticity, and in other words, the control operation of converter unit 320 does not need to be limited to detection signal SD.
Figure 10 is the circuit diagram of the converter unit illustrated according to one embodiment of the invention.This converter unit 420 can be applicable to the power converter shown in Fig. 1, Fig. 8, Fig. 9, but not as limit.
In the present embodiment, converter unit 420 comprises resonant transform circuit 421, wherein resonant transform circuit 421 can be full-bridge LLC type resonant transform circuit, but not as limit, that is have in the art and usually know the knowledgeable, resonant transform circuit 421 can be realized for actual demand with series resonance translation circuit, parallel resonance translation circuit, series parallel resonance translation circuit, LLC series resonant circuit or other similar resonant transform circuits.
Figure 11 be according to the embodiment of the present invention illustrate a kind of apply the converter unit shown in Figure 10 in the power converter shown in Fig. 1 when output voltage Vo(that is, the voltage at output capacitance COUT two ends) curve synoptic diagram of input voltage vin change relatively.Dotted line represents that power converter adopts conventional constant voltage design, and the output voltage of traditional power converter is that constant voltage exports.Solid line represents the output voltage of the power converter adopting the technology of the present invention.Design compared to conventional constant voltage, the output voltage Vo of converter unit 420 has multiple part charge along with the change of input voltage vin, each part charge has corresponding slope, some of part charge is (slope of part charge is zero) between areas of permanent pressure, the part charge of part is not (slope of part charge is non-vanishing) between areas of permanent pressure, and input voltage vin and output voltage Vo meet piecewise function relation.
Figure 12 illustrates a kind of curve synoptic diagram applying the relative input voltage vin change of frequency of operation in the power converter shown in Fig. 1 when of the converter unit shown in Figure 10 according to the embodiment of the present invention.As shown in figure 12, dotted line represents that power converter adopts the frequency of operation change of conventional constant voltage design, and solid line represents that power converter adopts the frequency of operation change of the embodiment of the present invention.With the power converter adopting conventional constant voltage to design, the frequency of operation (such as: the frequency of operation of switch) of power converter changes in frequency-tuning range fmin ~ fmax, and adopt the embodiment of the present invention with power converter, frequency of operation change then corresponding controlled variable (as: output voltage Vo) change in oscillation in frequency-tuning range fmin1 ~ fmax1 with multiple part charge of its converter unit, the resonance frequency fr of this power converter is within this frequency-tuning range, wherein resonance frequency fr can be determined by the resonant inductance LR of Figure 10 and resonant capacitance CR.
From above-described embodiment, compared to conventional constant voltage design, the change of its frequency of operation of the converter unit in the power converter of the embodiment of the present invention is less.Therefore, when certain frequency of operation variable quantity, the input voltage range of the power converter of the embodiment of the present invention is wider, can compatible multiple busbar voltage.
Figure 13 illustrates a kind of curve synoptic diagram applying the relative frequency of operation change of efficiency in the power converter shown in Fig. 1 when of the converter unit shown in Figure 10 according to the embodiment of the present invention.As shown in Figure 12, to adopt the converter unit of the controlled variable in the embodiment of the present invention with multiple part charge, frequency of operation change in oscillation in frequency-tuning range fmin1 ~ fmax1 of converter unit, less than the frequency of operation (this frequency of operation changes in frequency-tuning range fmin ~ fmax) of the power converter adopting conventional constant voltage design, therefore, as shown in Figure 13, under same hardware designs condition, the controlled variable in the present invention with multiple part charge is adopted more easily to design the power converter (such as: efficiency improves about more than 1%) with high efficiency performance compared with conventional constant voltage design, make under same efficiency requirements, compared with traditional power converter, adopt the power converter of the technology of the present invention can not need the hardware designs of raising efficiency, the cost of power converter is made to reduce about more than 15%, and under same cost conditions, the size of power converter reduces more than 15%.
Figure 14 is the circuit diagram of the converter unit illustrated according to another embodiment of the present invention.This converter unit 520 can be applicable to the power converter shown in Fig. 1, Fig. 8, Fig. 9, but not as limit.
In the present embodiment, converter unit 520 comprises pulse width modulation (Pulse-Width-Modulation, PWM) translation circuit 521, hereinafter referred to as PWM translation circuit, wherein PWM translation circuit 521 can be full-bridge type (full-bridge) PWM translation circuit, but not as limit.In other words, have in the art and usually know the knowledgeable, PWM translation circuit 521 can be realized for actual demand and according to spirit of the present invention with semibridge system (half-bridge) PWM translation circuit, flyback (flyback) PWM translation circuit, feed forward type (feed-forward) PWM translation circuit, buck (buck) PWM translation circuit, boost type (boost) PWM translation circuit, step-down/up type (buck-boost) PWM translation circuit or other similar PWM translation circuits.
Figure 15 be according to the embodiment of the present invention illustrate a kind of apply the converter unit shown in Figure 14 in the power converter shown in Fig. 1 when output voltage Vo(that is, the voltage at output capacitance COUT two ends) curve synoptic diagram of input voltage vin change relatively.Dotted line represents that power converter adopts conventional constant voltage design, and the output voltage of traditional power converter is that constant voltage exports.Solid line represents the output voltage of the power converter adopting the technology of the present invention.Design compared to conventional constant voltage, the output voltage Vo of converter unit 520 has multiple part charge along with the change of input voltage vin, each part charge has corresponding slope, some of part charge is (slope of part charge is zero) between areas of permanent pressure, the part charge of part is not (slope of part charge is non-vanishing) between areas of permanent pressure, and input voltage vin and output voltage Vo meet piecewise function relation.
Figure 16 illustrates a kind of curve synoptic diagram applying the relative input voltage change of duty ratio in the power converter shown in Fig. 1 when of the converter unit shown in Figure 14 according to the embodiment of the present invention.As shown in figure 16, dotted line represents that power converter adopts the change in duty cycle of conventional constant voltage design, and solid line represents that power converter adopts the change in duty cycle of the embodiment of the present invention.With the power converter adopting conventional constant voltage to design, the duty ratio (such as: the operation duty ratio of switch) of power converter changes in scope Dmin ~ Dmax, and to adopt the power converter of the embodiment of the present invention, the change in duty cycle of its converter unit is then corresponding to controlled variable (as: output voltage Vo) change in oscillation in duty cycle adjustment scope Dmin1 ~ Dmax with multiple part charge.In the present embodiment, to adopt the power converter of the embodiment of the present invention, the duty ratio (duty) of its converter unit is corresponding to the work period (duty cycle) of converter unit.
From above-described embodiment, compared to conventional constant voltage design, its change in duty cycle of the converter unit in the power converter of the embodiment of the present invention is less.Therefore, when certain change in duty cycle amount, compared to the input voltage range of the power converter of conventional constant voltage design, the input voltage range of the power converter of the embodiment of the present invention is wider, can compatible multiple busbar voltage.
Figure 17 illustrates a kind of curve synoptic diagram applying the efficiency relative duty cycles change in the power converter shown in Fig. 1 when of the converter unit shown in Figure 14 according to the embodiment of the present invention.As shown in Figure 16, to adopt the converter unit with the controlled variable of multiple part charge of the present invention, duty ratio change in oscillation in scope Dmin1 ~ Dmax of converter unit, less than the duty cycle range Dmin ~ Dmax of the power converter adopting conventional constant voltage design, therefore, as shown in Figure 17, under same hardware designs condition, the controlled variable in the present invention with multiple part charge is adopted more easily to design the power converter (such as: efficiency improves about more than 1%) with high efficiency performance compared with conventional constant voltage design, make under same efficiency requirements, compared with traditional power converter, adopt the power converter of the technology of the present invention can not need the hardware designs of raising efficiency, the cost of power converter is made to reduce about more than 15%, and under same cost conditions, the size of power converter reduces more than 15%.
As seen from the above embodiment, the controlled variable with multiple part charge of the technology of the present invention can be applicable to various different translation circuit (resonant transform circuit or PWM translation circuit), makes the design of power converter have higher elasticity.
In addition, under same hardware designs condition, the controlled variable in the present invention with multiple part charge is adopted more easily to design the power converter (such as: efficiency improves about more than 1%) with high efficiency performance compared with conventional constant voltage design, make under same efficiency requirements, compared with traditional power converter, adopt the power converter of the technology of the present invention can not need the hardware designs of raising efficiency, the cost of power converter is made to reduce about more than 15%, and under same cost conditions, the size of power converter reduces more than 15%.
The present invention relates to a kind of power conversion system again on the other hand.Figure 18 is the circuit diagram of the power conversion system illustrated according to one embodiment of the invention.As shown in figure 18, power conversion system 60 comprises the power converter 600a ~ 600n of multiple coupled in parallel, wherein in power converter 600a ~ 600n, at least one can be the power converter of the aforementioned embodiment of the present invention, and multiple power converter 600a ~ 600n be connected in parallel is electrically coupled in load.
Figure 19 A and Figure 19 B illustrates the circuit diagram that the power converter according to the embodiment of the present invention connects with other power circuits.As shown in Figure 19 A, in one embodiment, power converter 700 is power converters of the aforementioned embodiment of the present invention, and connect with other power circuits 800, wherein power converter 700 is near load end, other power circuits 800 can be the power circuit beyond power converter, such as, and bus-bar transducer (bus converter).
As shown in Figure 19 B, in another embodiment, power converter 700 is connected with other power circuits 900, wherein power converter 700 is near input, other power circuits 900 can be the power circuit beyond power converter, such as, phase-locked loop circuit (Phase-Lock-Loop circuit).
As seen from the above embodiment, the mode that power converter of the present invention can be connected in parallel is applied in power conversion system, power converter of the present invention also can be connected in series with other power circuits the design realizing power converter, make power converter can flexible Application in various circuit.
The present invention relates to a kind of electric power conversion method on the other hand, and it can be applicable to the power converter shown in Fig. 1, Fig. 8, Fig. 9, but is not limited with it.For the purpose of clear and convenient explanation, following electric power conversion method explains for the power converter 100 shown in Fig. 1.
First, by converter unit 120 output transform electric power (such as: the conversion electric power corresponding with output voltage Vo or output current Io).Then, detection signal SD is received by signal generation unit 130, to produce reference signal SR.Afterwards, receive reference signal SR by control unit 140, and control converter unit 120 according to reference signal SR, so as to adjusting the controlled variable of converter unit 120.Above-mentioned controlled variable has multiple part charge, and above-mentioned each part charge has corresponding slope, and the slope of at least two part charges is different.
In the present embodiment, above-mentioned controlled variable comprises at least one in input voltage vin, input current Iin, output voltage Vo and output current Io; In other words, above-mentioned controlled variable can be input voltage vin, input current Iin, output voltage Vo and output current Io one of them or wherein count person.For example, above-mentioned controlled variable can be output voltage Vo, or also can comprise output voltage Vo and output current Io simultaneously, but not as limit.
Secondly, with detection signal SD, detection signal SD produces corresponding at least one in input voltage vin, input current Iin, output voltage Vo and output current Io; In other words, above-mentioned detection signal SD can corresponding to input voltage vin, input current Iin, output voltage Vo and output current Io one of them or wherein count person and producing.For example, detection signal SD can correspondingly produce after detection output voltage Vo, or also can produce after detection output voltage Vo and output current Io, but not as limit.
In one embodiment, reference signal SR has multiple part charge.
It should be noted that, above-mentioned controlled variable and detection signal can the embodiment of application drawing 2A ~ Fig. 3 B and Fig. 5 A ~ Fig. 7 B set, make controlled variable have multiple part charge, each part charge has corresponding slope, and in above-mentioned part charge, at least the slope of the two is different.The specific descriptions of controlled variable and detection signal are described above, therefore repeat no more in this.
In another embodiment, in the part charge of above-mentioned controlled variable adjacent two part charges slope between angle can be designed to be more than or equal to 90 degree.
On the implementation, in the part charge of above-mentioned controlled variable at least one corresponding to converter unit 120 adjustment operation and produce, make the design of electric power conversion method have more elasticity.Specifically, control unit 140 can pass through feedback control loop, open loop or feed forward control loop and controls converter unit 120 produces above-mentioned controlled variable wherein one or more part charges with the reference signal SR produced according to detection signal SD.
On the other hand, followingly another embodiment of electric power conversion method will be described with the power converter 300 of Fig. 9, but not as limit.
In the present embodiment, electric power conversion method also receives Setting signal SG by signal generation unit 330, and produces reference signal SR according to detection signal SD and Setting signal SG; Then, receive reference signal SR by control unit 340, and according to switching circuit Q1a and Q1b that reference signal SR controls converter unit 320, adjust the controlled variable of converter unit 320 with the operation by switching circuit Q1a, Q1b.
From above-described embodiment, electric power conversion method can introduce Setting signal SG in the design of power converter, makes the design of electric power conversion method have more elasticity, and in other words, the control operation for converter unit 340 does not need to be limited to detection signal SD.
From describing above, to adopt the power converter of the technology of the present invention, the controlled variable of its converter unit has multiple part charge, and the efficiency of the power converter that the efficiency of power converter of the present invention is designed than conventional constant voltage is high.Therefore, under same efficiency requirements, compared with traditional power converter, adopt the power converter of the technology of the present invention can not need the hardware designs of raising efficiency, the cost of power converter is reduced, and under same cost conditions, the size of power converter reduce.
Secondly, compared to conventional constant voltage design, to adopt the power converter of the technology of the present invention, frequency of operation or the change in duty cycle of the converter unit in power converter are less.Therefore, when certain frequency of operation or change in duty cycle amount, compared to the input voltage range of the power converter of conventional constant voltage design, adopt the input voltage range of the power converter of the technology of the present invention wider, can compatible multiple busbar voltage.
Although the present invention discloses as above with execution mode; so itself and be not used to limit the present invention; anyly be familiar with this those skilled in the art; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, the scope that therefore protection scope of the present invention ought define depending on appending claims is as the criterion.
Claims (18)
1. a power converter, is characterized in that, comprises:
One converter unit, in order to export a conversion electric power;
One signal generation unit, in order to receive a detection signal, produces a reference signal; And
One control unit, couples described converter unit and described signal generation unit, in order to receive described reference signal, and controls described converter unit according to described reference signal, to adjust a controlled variable of described converter unit;
Wherein said controlled variable has multiple part charge, and in described multiple part charge, each has corresponding slope, and in described multiple part charge, at least the slope of the two is different.
2. power converter according to claim 1, is characterized in that, described controlled variable comprises at least one in an input voltage, an input current, an output voltage and an output current.
3. power converter according to claim 1, is characterized in that, described detection signal produces corresponding at least one in an input voltage, an input current, an output voltage and an output current.
4. power converter according to claim 1, is characterized in that, described reference signal has multiple part charge.
5. power converter according to claim 1, it is characterized in that, described signal generation unit is also in order to receive a Setting signal, described signal generation unit is in order to produce described reference signal according to described detection signal and described Setting signal, described control unit in order to control described converter unit according to described reference signal, to adjust the described controlled variable of described converter unit.
6. power converter according to claim 1, is characterized in that, in described multiple part charge adjacent two part charges slope between angle be more than or equal to 90 degree.
7. power converter according to claim 1, is characterized in that, described converter unit also comprises a buffer circuit.
8. power converter according to claim 1, is characterized in that, described converter unit also comprises a resonant transform circuit.
9. power converter according to claim 8, is characterized in that, described resonant transform circuit is a LLC type resonant transform circuit.
10. power converter according to claim 1, it is characterized in that, described control unit controls described converter unit, makes a frequency of operation of described converter unit corresponding to described multiple part charge change in oscillation in a frequency-tuning range of described controlled variable.
11. power converters according to claim 1, it is characterized in that, described control unit controls described converter unit, makes a duty ratio of described converter unit corresponding to described multiple part charge change in oscillation within the scope of a duty cycle adjustment of this controlled variable.
12. 1 kinds of electric power conversion methods, is characterized in that, comprise:
A conversion electric power is exported by a converter unit;
Receive a detection signal by a signal generation unit, produce a reference signal; And
Receive described reference signal by a control unit and control described converter unit according to described reference signal, in order to adjust the controlled variable of described converter unit;
Wherein said controlled variable has multiple part charge, and in described multiple part charge, each has corresponding slope, and in described multiple part charge, at least the slope of the two is different.
13. electric power conversion methods according to claim 12, is characterized in that, described reference signal has multiple part charge.
14. electric power conversion methods according to claim 12, it is characterized in that, described detection signal is received by described signal generation unit, produce described reference signal, then receive described reference signal by described control unit and also comprise according to the step that described reference signal controls described converter unit:
A Setting signal is received by described signal generation unit, and produce described reference signal according to described detection signal and described Setting signal, described control unit in order to control described converter unit according to described reference signal, in order to adjust the described controlled variable of described converter unit.
15. electric power conversion methods according to claim 12, is characterized in that, in described multiple part charge adjacent two part charges slope between angle be more than or equal to 90 degree.
16. 1 kinds of power conversion systems, is characterized in that, comprise:
Multiple power converter coupled in parallel, in wherein said multiple power converter, each comprises:
One converter unit, wherein said converter unit is in order to export a conversion electric power;
One signal generation unit, in order to receive a detection signal, produces a reference signal; And
One control unit, couples described converter unit and described signal generation unit, in order to receive described reference signal, and controls this converter unit according to described reference signal, to adjust a controlled variable of described converter unit;
Wherein said controlled variable has multiple part charge, and in described multiple part charge, each has corresponding slope, and in described multiple part charge, at least the slope of the two is different.
17. power conversion systems according to claim 16, is characterized in that, described reference signal has multiple part charge.
18. power conversion systems according to claim 16, it is characterized in that, described signal generation unit is also in order to receive a Setting signal, described signal generation unit produces described reference signal according to described detection signal and described Setting signal, described control unit in order to control described converter unit according to described reference signal, to adjust the described controlled variable of described converter unit.
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| CN201310267787.3A CN104253532B (en) | 2013-06-28 | 2013-06-28 | Power converter, power conversion system and electric power conversion method |
| TW102125490A TWI493858B (en) | 2013-06-28 | 2013-07-17 | Power converter, power conversion system and power conversion method |
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| CN201310267787.3A CN104253532B (en) | 2013-06-28 | 2013-06-28 | Power converter, power conversion system and electric power conversion method |
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| CN107947123A (en) * | 2017-10-24 | 2018-04-20 | 深圳市必易微电子有限公司 | ACDC protective circuit of switch power source and ACDC switching power units |
| CN114244137A (en) * | 2021-12-21 | 2022-03-25 | 西南交通大学 | Control method of LLC resonant matrix converter based on alternating current link |
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Also Published As
| Publication number | Publication date |
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| CN104253532B (en) | 2017-09-15 |
| TW201501457A (en) | 2015-01-01 |
| TWI493858B (en) | 2015-07-21 |
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