CN208241576U - DC-to-DC converter - Google Patents
DC-to-DC converter Download PDFInfo
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- CN208241576U CN208241576U CN201820866552.4U CN201820866552U CN208241576U CN 208241576 U CN208241576 U CN 208241576U CN 201820866552 U CN201820866552 U CN 201820866552U CN 208241576 U CN208241576 U CN 208241576U
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Abstract
Disclose a kind of DC-to-dc converter, the technical solution of the utility model embodiment is by the way that the input port of Switching capacitors and switch converters to be connected with each other one of in series or in parallel, output port in series or in parallel in another be connected with each other, reduce the power transmitted via switch converters, since the efficiency of Switching capacitors is higher than the efficiency of switch converters, thus, it is possible to improve the efficiency of circuit system.Simultaneously as the presence of switch converters, so that the DC-to-dc converter based on the utility model embodiment has adjustable smooth output, and has adjustable gain.
Description
Technical field
The utility model relates to power electronic technique, and in particular to a kind of DC-to-dc converter.
Background technique
Switching capacitors pass through the charging and discharging of switch control capacitor, realize voltage or current transformation.But it opens
The transformation of the fixed no-load voltage ratio of input and output voltage can only be realized by closing capacitive transducer, simultaneously because undesirable electric current on input power
It pulses larger, so that there is also pulsation for output voltage.In the prior art, in order to change the ratio transformation of input and output voltage,
Simultaneously for smooth output voltage, it will usually connect traditional switch change-over in the prime or rear class of Switching capacitors
Device, as shown in Figure 1, input stage is Switching capacitors 1, output stage is then the switch converters 2 using buck topology.But
It is in this circuit connecting mode, all power is all transmitted by switch converters, and there are still mention for the efficiency of circuit system
Between lift-off.
Utility model content
In view of this, the utility model embodiment provides a kind of DC-DC converter, smoothly adjusted in guarantee output voltage
The efficiency of circuit system is improved while whole.
The DC-to-dc converter of the utility model embodiment includes:
Switching capacitors；And
Switch converters；
Wherein, the input port of the Switching capacitors and the switch converters in series or in parallel in
A kind of interconnection, output port in series or in parallel in another be connected with each other.
Further, the series connection of the input port of the Switching capacitors and the switch converters and output end
Mouth is connected in parallel.
Further, the input port of the switched mode converter and the switch converters is connected in parallel and output port
It is connected in series.
Further, the Switching capacitors are that isolated form Switching capacitors or non-isolation type switching capacity become
Parallel operation.
Further, the Switching capacitors and the switch converters are configured to carry out bidirectional power change
The converter changed, so that the DC-to-dc converter is able to carry out bidirectional modulation.
Further, the switch converters are that booster type topology, buck topology, buck-boost type topology and inverse-excitation type are opened
Close converter, Zeta topology, Sepic topology, Cuk topology, forward converter, push-pull converter, half bridge converter, entirely
Bridge converter, LLC converter it is any.
Further, the Switching capacitors include:
N number of first capacitor has first end interconnected；
N number of second capacitor is sequentially connected in series input port and the switch change-over in the Switching capacitors
Between the input port of device, or it is connected in series in the output port and the switch converters of the Switching capacitors
Between output port；
N number of first switch group, each first switch group are used for the second end of corresponding first capacitor selectively
It is connected to the first end or second end of corresponding second capacitor；And
Second switch group, for N number of first capacitor first end interconnected to be used to selectively connect to output port
First end or second end or second switch group are for N number of first capacitor first end interconnected to be used to selectively connect to
The first end or second end of input port；
Wherein, the first switch group and the controlled carry out state of the second switch group are switched so that the direct current-is straight
The output voltage and input voltage of stream transformer are proportional, wherein N is the natural number not less than 1.
Further, the Switching capacitors further include:
At least one isolation capacitance is connected to the either end of the output port of the Switching capacitors and described N number of
Between any end of second capacitance connection, or it is connected to either end and the institute of the input port of the Switching capacitors
Between any end for stating N number of second capacitance connection.
Further, each first switch group and the second switch group be include first switch and the second switch
Half-bridge circuit, wherein the switch state of the first switch and the second switch is complementary state.
Further, the switch converters include:
Output capacitance is connected to the both ends of the output port.
The technical solution of the utility model embodiment is by by the input port of Switching capacitors and switch converters
Be connected with each other one of in series or in parallel, output port in series or in parallel in it is another be connected with each other,
The power transmitted via switch converters is reduced, since the efficiency of Switching capacitors is higher than the efficiency of switch converters,
Thus, it is possible to improve the efficiency of circuit system.Simultaneously as the presence of switch converters, so that being implemented based on the utility model
The DC-to-dc converter of example has adjustable smooth output, and has adjustable gain.
Detailed description of the invention
By referring to the drawings to the description of the utility model embodiment, the above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from, in the accompanying drawings:
Fig. 1 is the circuit diagram of the DC-to-dc converter of a prior art；
Fig. 2 is the circuit diagram of the DC-to-dc converter of the utility model first embodiment；
Fig. 3 is the circuit diagram of the DC-to-dc converter of the utility model first embodiment；
Fig. 4 is the circuit diagram of the Switching capacitors of the utility model first embodiment；
Fig. 5 is the circuit diagram of the Switching capacitors of the utility model first embodiment；
Fig. 6 is the circuit diagram of the Switching capacitors of the utility model first embodiment；
Fig. 7 is the circuit diagram of the DC-to-dc converter of the utility model second embodiment；
Fig. 8 is the circuit diagram of the DC-to-dc converter of the utility model second embodiment.
Specific embodiment
The utility model is described below based on embodiment, but the utility model is not restricted to these implementations
Example.It is detailed to describe some specific detail sections below in the datail description of the utility model.To those skilled in the art
The utility model can also be understood completely in the description of part without these details for member.In order to avoid obscuring the utility model
Essence, there is no narrations in detail for well known method, process, process, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to be passed through electrically by least one element or sub-circuit
The galvanic circle that connection or electromagnetism connect and compose.When title element or the " connection of another element of circuit " being connected to " or element/circuit
" between two nodes when, it, which can be, is directly coupled or connected another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, when claiming element " being directly coupled to " or " directly connecting
Be connected to " another element when, it is meant that the two be not present intermediary element.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, be " including but not limited to " contains
Justice.
In the description of the present invention, it should be understood that term " first ", " second " etc. are used for description purposes only,
It is not understood to indicate or imply relative importance.In addition, in the description of the present invention, unless otherwise indicated, it is " more
It is a " it is meant that two or more.
Fig. 2 is the circuit diagram of the DC-to-dc converter of the utility model first embodiment.As shown in Fig. 2, this reality
The DC-to-dc converter for applying example includes Switching capacitors 21 and switch converters 22.Wherein, Switching capacitors 21
It is connected in parallel with the input port series connection of switch converters 22, output port.
Switching capacitors 21 are isolated form Switching capacitors or non-isolation type Switching capacitors.Switching mode
21 open loop of capacitive transducer work, the relationship of input voltage and output voltage are as follows:
Wherein, Vin1 is the input voltage of Switching capacitors 21, and Vout1 is the output electricity of Switching capacitors 21
Pressure, X are a constant.By the output voltage of regulating switch capacitive transducer 21 and the ratio X of input voltage so that it is full
The demand of sufficient actual circuit.
Switch converters 22 adjust duty ratio according to the final required voltage of circuit, using closed loop mode of operation, input
The relationship of voltage and output voltage are as follows:
Wherein, Vin2 is the input voltage of switch converters 22, and Vout2 is the output voltage of switch converters 22, and D is to open
The duty ratio of the control signal of converter 22 is closed, M (D) is the function about duty ratio D.
Connect since the input port of Switching capacitors 21 and switch converters 22 is connected in series, output port is in parallel
It connects, therefore the input voltage of the DC-to-dc converter in the present embodiment and output voltage meet following relationship:
Since the output port of the output port and switch converters 22 of Switching capacitors 21 is connected in parallel, so
Vout1=Vout2=Vout.
Therefore, the relationship of the input voltage of the DC-to-dc converter of the present embodiment and output voltage are as follows:
Preferably, Switching capacitors 21 and switch converters 22 are configured to carry out the change of bi-directional power conversion
Parallel operation, so that the DC-to-dc converter of the present embodiment is able to carry out bidirectional modulation.
It should be understood that switch converters 22 can for booster type topology, buck topology, buck-boost type topology, Zeta it is topological,
Sepic topology, Cuk topology, inverse excitation type converter, forward converter, push-pull converter, half bridge converter, full-bridge type
Any one of converter and LLC converter.
The DC-to-dc converter of the present embodiment is by using by the input terminal of Switching capacitors and switch converters
Mouthful be connected in series, the connection type that is connected in parallel of output port so that Switching capacitors given simultaneously with switch converters it is defeated
Power is transmitted out, reduces the power transmitted via switch converters, and since the efficiency of Switching capacitors is higher than switch
Converter, therefore this improves system effectiveness.And the present embodiment is adjusted defeated by the duty ratio of regulating switch converter 22
Voltage out realizes the smooth adjustment of output voltage, and has adjustable gain.
Fig. 3 is the circuit diagram of the DC-to-dc converter of the utility model first embodiment.As shown in figure 3, this reality
The DC-to-dc converter for applying example includes the Switching capacitors 31 and switch converters 32 of isolated form.Wherein, switching capacity
The input port of converter 31 and switch converters 32 is connected in series, output port is connected in parallel.Switching capacitors 31 wrap
Include two first switch groups, a second switch group, two first capacitors C3 and C4, two the second capacitor C1 and C2 and isolation
Capacitor C5.Wherein, a first switch group includes the switch Q1 and Q2 being serially connected, and the two forms a half-bridge circuit.It is another
A first switch group includes the switch Q3 and Q4 being serially connected, and the two also forms a half-bridge circuit.Second switch group is mutual
Concatenated switch Q5 and Q6, the two form a half-bridge circuit.The intermediate ends of first capacitor C3 and C4 are connected to end a.Hold a connection
To the intermediate ends b for the half-bridge circuit being made of switch Q5 and switch Q6, so that be connected to capacitance switch change with holding a property of can choose
The end o1 or ground terminal of the output port of parallel operation 31.The other end m1 and m2 of first capacitor C3 and C4 be connected respectively to switch Q1 and
The intermediate ends of the half-bridge circuit of the intermediate ends and switch Q3 and switch Q4 composition of the half-bridge circuit of switch Q2 composition.Second capacitor
C1 and C2 is sequentially connected in series between the both ends of the input port of Switching capacitors 31 (that is, being connected in series in end n1 and n3
Between).Wherein, the second capacitor C1 is connected between end n1 and end n2, and the second capacitor C2 is connected between end n2 and end n3.By opening
The half-bridge circuit for closing Q1 and switch Q2 composition is used to for the end m1 of first capacitor C3 to be used to selectively connect to end n1 or holds n2.By opening
The half-bridge circuit for closing Q3 and switch Q4 composition is used to for the end m2 of first capacitor C4 to be used to selectively connect to end n2 or holds n3.
Isolation capacitance C5 is connected between the end n3 of input port and ground terminal, and optionally, isolation capacitance C5 can also connect
It connects between end n2 and ground terminal, or between end n1 and ground terminal.In the present embodiment, the effect of isolation capacitance C5 is to be formed
The two ports are isolated while current reflux access between input port and output port.
Wherein, switch Q1 and switch Q2 is controlled by control signal GH1 and GL1 respectively, and switch Q3 and switch Q4 are respectively by controlling
Signal GH1 and GL1 control processed.Signal GH1 and GL1 reverse phase are controlled, this makes switch Q1 and switch Q2 complementary, switch Q3 and switch
Q4 is complementary.That is, switch Q1 conducting synchronous with switch Q3, meanwhile, switch Q2 and switch Q4 are turned off, conversely, switch Q2 and Q4 is same
Step conducting, switch Q1 and switch Q3 are turned off.Switch Q5 and switch Q6 is controlled by control signal GH2 and GL2 respectively, and GH2 and GL2
Reverse phase, this makes the switch state of switch Q5 and switch Q6 complementary.Meanwhile it controlling signal GH2 and being opened for controlling two first
The same phase of control signal GH1 of pass group.That is, switch Q1, Q3 and Q5 are simultaneously turned on or are turned off, meanwhile, switch Q2, Q4 and Q6
In opposite state.Control switch Q1-Q6 is distinguished by control signal GH1, GL1, GH2 and GL2 as a result, and carries out state switching
So that the output voltage Vout1 of Switching capacitors 31 and the ratio of input voltage vin 1 are a fixed value, Ye Jikai
The output voltage Vout1 and input voltage vin 1 for closing capacitive transducer 31 meet following relationship:
Switch converters 32 include switch Q7, switch Q8, output capacitance C6 and the inductance L as magnetic element.Wherein,
Switch Q7 and switch Q8 is sequentially connected in series between one end n3 and ground terminal of input port.Inductance L be connected to switch Q7 and
Between the intermediate ends of switch Q8 and one end o2 of output port.Output capacitance C6 is connected to one end o2 and the other end of output port
Between o3 (namely ground terminal).
It is readily appreciated that, the connection type of above-mentioned Switching capacitors 31 and switch converters 32 converts switching capacity
The input port of device 31 and switch converters 32 is connected in series between the both ends of input voltage vin, Switching capacitors 31
(namely end o2 and ground terminal between) is connected between the both ends of output port in parallel with the output port of switch converters 32.
Switch Q7 and switch Q8 is controlled by control signal GH3 and GL3 respectively.Signal GH3 and GL3 reverse phase is controlled, so that opening
It is complementary to close Q7 and switch Q8.Therefore, the output voltage Vout2 of switch converters 32 is by input voltage vin 2 and control signal GH3
Duty ratio determine.So can according to desired output voltage adjust control signal GH3 duty ratio so that switch Q7 with
The shutdown of switch Q8 alternate conduction controls the time of inductance L and capacitor C6 charging and discharging to carry out power conversion.Switch change-over
The output voltage and input voltage of device 32 meet following relationship:
Wherein, D is the duty ratio for controlling signal GH3, and M (D) is the function about duty ratio D.Control signal GH3 and
GL3 consecutive hours, M (D)=D.That is, the output voltage of switch converters 32 and the ratio of input voltage are switch converters 32
Control the value of the duty ratio of signal.
Connect since the input port of Switching capacitors 31 and switch converters 32 is connected in series, output port is in parallel
It connects, therefore the input voltage of the DC-to-dc converter in the present embodiment and output voltage meet following relationship:
Since the output port of the output port and switch converters 32 of Switching capacitors 31 is connected in parallel, so
Vout1=Vout2=Vout.
Therefore, the relationship of the input voltage of the DC-to-dc converter of the present embodiment and output voltage are as follows:
It should be understood that in the present embodiment, switch Q1-Q8 uses metal oxide semiconductor transistor (MOSFET).But
Other types of electric-controlled switch device, for example, bipolar transistor (BJT) and insulated gate transistor (IGBT) also can be with
Switch as the present embodiment.
Switch converters 32 in the present embodiment are buck topology, it is understood by one skilled in the art that according to reality
The demand of circuit, switch converters 32 can also be booster type topology, buck-boost type topology, Zeta topology, Sepic topology, Cuk
Topology, inverse excitation type converter, forward converter, push-pull converter, half bridge converter, full-bridge converter and LLC become
Any one of parallel operation.
The DC-to-dc converter of the present embodiment is by using by the input terminal of Switching capacitors and switch converters
Mouthful be connected in series, the connection type that is connected in parallel of output port so that Switching capacitors given simultaneously with switch converters it is defeated
Power is transmitted out, reduces the power transmitted via switch converters, to improve system effectiveness.And the present embodiment passes through
The duty ratio of the control signal of regulating switch converter adjusts output voltage, realizes the smooth adjustment of output voltage, and have
There is adjustable gain.Meanwhile the present embodiment can realize input by setting isolation capacitance under the premise of not using transformer
Port and output port isolation, avoid the influence of the pulsation of current on input voltage and output capacitance.
Fig. 4 is the circuit diagram of the Switching capacitors of the utility model first embodiment.Fig. 5 is the utility model
The circuit diagram of the Switching capacitors of first embodiment.Fig. 6 is that the switching capacity of the utility model first embodiment becomes
The circuit diagram of parallel operation.Further, the Switching capacitors of the present embodiment may include N number of first capacitor, N number of second
Capacitor, N number of first switch group, second switch group and at least one isolation capacitance, N are the natural number not less than 1.
Wherein, N number of first capacitor has first end interconnected.N number of second capacitor is sequentially connected in series in switch electricity
Hold between the input port of converter 31 and the input port of switch converters 32.Each first switch group is used for corresponding the
The second end of one capacitor is used to selectively connect to the first end or second end of corresponding second capacitor.Second switch group is used for N
A first capacitor first end interconnected is used to selectively connect to the first end or second end of output port.As Fig. 4 (N=1),
Shown in Fig. 5 (N=2), Fig. 6 (N > 2).Wherein, the ratio of the output voltage of Switching capacitors and input voltage are as follows:
In the control signal consecutive hours of switch converters, the output voltage of DC-to-dc converter and the pass of input voltage
System are as follows:
Thus, it is possible to by changing the first capacitor in Switching capacitors, the second capacitor and of first switch group
The duty ratios of several and switch converters control signals changes the input/output relation of DC-to-dc converter to meet reality
The demand of output voltage in the circuit of border.
Fig. 7 is the circuit diagram of the DC-to-dc converter of the utility model second embodiment.As shown in fig. 7, this reality
The DC-to-dc converter for applying example includes Switching capacitors 71 and switch converters 72.Wherein, Switching capacitors 71
It is connected in parallel with the input port of switch converters 72, output port is connected in series.
Switching capacitors 71 are isolated form Switching capacitors or non-isolation type Switching capacitors.Switching mode
71 open loop of capacitive transducer work, the relationship of input voltage and output voltage are as follows:
Wherein, Vin1 ' is the input voltage of Switching capacitors 71, and Vout1 ' is the output of Switching capacitors 71
Voltage, X ' are a constant.In the present embodiment, the output voltage and input electricity of regulating switch capacitive transducer 71 can be passed through
The ratio X of pressure ' meet the needs of actual circuit.
Switch converters 72 according to the duty ratio of the control signal of the final required voltage regulating switch converter 72 of circuit,
Using closed loop mode of operation, the relationship of input voltage and output voltage are as follows:
Wherein, Vin2 ' is the input voltage of switch converters 72, and Vout2 ' is the output voltage of switch converters 72, and D is
The duty ratio of the control signal of switch converters 72, M ' (D) is the function about duty ratio D.
Due to Switching capacitors 71 are connected in parallel with the input port of switch converters 72, output port is connected company
It connects, therefore the input voltage of the DC-to-dc converter in the present embodiment and output voltage meet following relationship:
Vout '=Vout1 '+Vout2 '=X ' * Vin1 '+M ' (D) * Vin2 '
Since the input port of the input port and switch converters 72 of Switching capacitors 71 is connected in parallel, so
Vin1 '=Vin2 '=Vin '.
Therefore, the relationship of the input voltage of the DC-to-dc converter of the present embodiment and output voltage are as follows:
Preferably, Switching capacitors 71 and switch converters 72 are configured to carry out the change of bi-directional power conversion
Parallel operation, so that the DC-to-dc converter of the present embodiment is able to carry out bidirectional modulation.
It should be understood that switch converters 72 can for booster type topology, buck topology, buck-boost type topology, Zeta it is topological,
Sepic topology, Cuk topology, inverse excitation type converter, forward converter, push-pull converter, half bridge converter, full-bridge type
Any one of converter and LLC converter.
The DC-to-dc converter of the present embodiment is by using by the input terminal of Switching capacitors and switch converters
Mouthful be connected in parallel, the connection type that output port is connected in series so that Switching capacitors given simultaneously with switch converters it is defeated
Power is transmitted out, reduces the power transmitted via switch converters, to improve system effectiveness.And the present embodiment passes through
The duty ratio of regulating switch converter 72 adjusts output voltage, realizes the smooth adjustment of output voltage, and have adjustable
Gain.
Fig. 8 is the circuit diagram of the DC-to-dc converter of the utility model second embodiment.As shown in figure 8, this reality
The DC-to-dc converter for applying example includes the Switching capacitors 81 and switch converters 82 of isolated form.Wherein, switching capacity
The input port of converter 81 and switch converters 82 is connected in parallel, output port is connected in series.Switching capacitors 81 wrap
Include two first switch groups, a second switch group, two first capacitors C3 ' and C4 ', two the second capacitor C1 ' and C2 ' and
Isolation capacitance C5 '.Wherein, a first switch group includes the switch Q1 ' and Q2 ' being serially connected.The two forms a half-bridge electricity
Road.Another first switch group includes the switch Q3 ' and Q4 ' being serially connected.The two also forms a half-bridge circuit.Second switch
Group is the switch Q5 ' and Q6 ' being serially connected.The two forms a half-bridge circuit.First capacitor C3 ' is connected with the intermediate ends of C4 '
To end a '.End a ' is connected to by the intermediate ends b ' of switch Q5 ' and switch Q6 ' half-bridge circuit formed, so that end a ' can choose
Property it is connected to the end in1 or ground terminal of the input port of capacitance switch converter 81.The other end of first capacitor C3 ' and C4 '
M1 ' and m2 ' is connected respectively to the intermediate ends and switch Q3 ' and switch Q4 ' of the half-bridge circuit of switch Q1 ' and switch Q2 ' composition
The intermediate ends of the half-bridge circuit of composition.Second capacitor C1 ' and the second capacitor C2 ' are sequentially connected in series in the defeated of Switching capacitors 81
Between the both ends of exit port (that is, being connected in series between the n1 ' and n3 ' of end).Wherein, the second capacitor C1 ' be connected to end n1 ' and
It holds between n2 ', the second capacitor C2 ' is connected between end n2 ' and end n3 '.The half-bridge circuit being made of switch Q1 ' and switch Q2 '
For the end m1 ' of first capacitor C3 ' to be used to selectively connect to end n1 ' or holds n2 '.Half be made of switch Q3 ' and switch Q4 '
Bridge circuit is used to for the end m2 ' of first capacitor C4 ' to be used to selectively connect to end n2 ' or holds n3 '.
Isolation capacitance C5 ' is connected between end n3 ' and ground terminal, and optionally, isolation capacitance C5 ' can also be connected to end
Between n2 ' and ground terminal, or between end n1 ' and ground terminal.In the present embodiment, the effect of isolation capacitance C5 ' is defeated in formation
The two ports are isolated while current reflux access between inbound port and output port.
Wherein, switch Q1 ' and switch Q2 ' is controlled by control signal GH1 ' and GL1 ' respectively, and switch Q3 ' and switch Q4 ' divide
It is not controlled by control signal GH1 ' and GL1 '.Signal GH1 ' and GL1 ' reverse phase is controlled, this makes switch Q1 ' and switch Q2 ' complementary,
Switch Q3 ' and switch Q4 ' are complementary.That is, switch Q1 ' conducting synchronous with switch Q3 ', meanwhile, switch Q2 ' and switch Q4 ' shutdown,
Conversely, switch Q2 ' conducting synchronous with Q4 ', switch Q1 ' and switch Q3 ' shutdown.Switch Q5 ' and switch Q6 ' is respectively by control signal
GH2 ' and GL2 ' control, and GH2 ' and GL2 ' reverse phase, this makes the switch state of switch Q5 ' and switch Q6 ' complementary.Meanwhile it controlling
Signal GH2 ' processed and the same phase of control signal GH1 ' for controlling two first switch groups.That is, switch Q1 ', Q3 ' and
Q5 ' is simultaneously turned on or is turned off, meanwhile, switch Q2 ', Q4 ' and Q6 ' are in opposite state.As a result, by control signal GH1 ',
Control switch Q1 '-Q6 ' carry out state is switched so that the output of Switching capacitors 81 is electric respectively by GL1 ', GH2 ' and GL2 '
It presses Vout1 ' and the ratio of input voltage vin 1 ' is the output voltage of a fixed value namely Switching capacitors 81
Vout1 ' and input voltage vin 1 ' meet following relationship:
Switch converters 82 include switch Q7 ', switch Q8 ', output capacitance C6 ' and the inductance L ' as magnetic element.
Wherein, switch Q7 ' and switch Q8 ' is sequentially connected in series between one end n3 ' and ground terminal of output port.Inductance L ' is connected to
Between one end in1 of the intermediate ends and input port of switch Q7 ' and switch Q8 '.Output capacitance C6 ' is connected to the one of output port
It holds between n3 ' and ground terminal.
It is readily appreciated that, the connection type of above-mentioned Switching capacitors 81 and switch converters 82 converts switching capacity
The input port of device 81 and switch converters 82 is connected in parallel between the both ends of input voltage vin, Switching capacitors 81
(namely between end n1 ' and ground terminal) is connected in series between the both ends of output port with the output port of switch converters 82.
Switch Q7 ' and switch Q8 ' is controlled by control signal GH3 ' and GL3 ' respectively.Signal GH3 ' and GL3 ' reverse phase is controlled,
So that switch Q7 ' and switch Q8 ' are complementary.Therefore, the output voltage Vout2 ' of switch converters 82 is by input voltage vin 2 ' and control
The duty ratio of signal GH3 ' and GL3 ' processed determines.So can according to desired output voltage adjust control signal GH3 ' and
The duty ratio of GL3 ', so that switch Q7 ' and the shutdown of switch Q8 ' alternate conduction, control inductance L ' and capacitor C6 ' and be charged and discharged
Time to carry out power conversion.The output voltage and input voltage of switch converters 82 meet following relationship:
Wherein, D is the duty ratio for controlling signal GH3 ', and M ' (D) is the function about duty ratio D.In control signal GH3 '
And GL3 ' consecutive hours, M (D)=1/D.That is, the output voltage of switch converters 82 and the ratio of input voltage are switch change-over
The inverse of the value of the duty ratio of the control signal of device 82.
Due to Switching capacitors 81 are connected in parallel with the input port of switch converters 82, output port is connected company
It connects, therefore the input voltage of the DC-to-dc converter in the present embodiment and output voltage meet following relationship:
Vout '=Vout1 '+Vout2 '=X ' * Vin1 '+M ' (D) * Vin2 '
Since the input port of the output port and switch converters 82 of Switching capacitors 81 is connected in parallel, so
Vin1 '=Vin2 '=Vin '.
Therefore, the relationship of the input voltage of the DC-to-dc converter of the present embodiment and output voltage are as follows:
It should be understood that in the present embodiment, switch Q1 '-Q8 ' uses metal oxide semiconductor transistor (MOSFET).But
It is other types of electric-controlled switch device, for example, bipolar transistor (BJT) and insulated gate transistor (IGBT) are also equal
It can be used as the switch of the present embodiment.
Switch converters 82 in the present embodiment are booster type topology, it is understood by one skilled in the art that according to reality
The demand of circuit, switch converters 82 can also be buck topology, buck-boost type topology, Zeta topology, Sepic topology, Cuk
Topology, inverse excitation type converter, forward converter, push-pull converter, half bridge converter, full-bridge converter and LLC become
Any one of parallel operation.
The DC-to-dc converter of the present embodiment is by using by the input terminal of Switching capacitors and switch converters
Mouthful be connected in parallel, the connection type that output port is connected in series so that Switching capacitors given simultaneously with switch converters it is defeated
Power is transmitted out, reduces the power transmitted via switch converters, to improve system effectiveness.And the present embodiment passes through
The duty ratio of the control signal of regulating switch converter adjusts output voltage, realizes the smooth adjustment of output voltage, and have
There is adjustable gain.Meanwhile the present embodiment can realize input by setting isolation capacitance under the premise of not using transformer
Port and output port isolation, avoid the influence of the pulsation of current on input voltage and output capacitance.
Further, Switching capacitors 81 may include N number of first capacitor, N number of second capacitor, N number of first switch
Group, second switch group and at least one isolation capacitance, N are the natural number not less than 1.
Wherein, N number of first capacitor has first end interconnected.N number of second capacitor is sequentially connected in series in switch electricity
Hold between the output port of converter 81 and the output port of switch converters 82.Each first switch group is used for corresponding the
The second end of one capacitor is used to selectively connect to the first end or second end of corresponding second capacitor.Second switch group is used for N
A first capacitor first end interconnected is used to selectively connect to the first end or second end of input port.Wherein, switch electricity
Hold the output voltage of converter and the ratio of input voltage are as follows:
In the control signal consecutive hours of switch converters, the output voltage of DC-to-dc converter and the pass of input voltage
System are as follows:
Thus, it is possible to by changing the first capacitor in Switching capacitors, the second capacitor and of first switch group
The duty ratios of several and switch converters control signals changes the input/output relation of DC-to-dc converter to meet reality
The demand of output voltage in the circuit of border.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, for this field
For technical staff, the utility model can have various modifications and changes.All institutes within the spirit and principle of the utility model
Any modification, equivalent substitution, improvement and etc. of work, should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of DC-to-dc converter, comprising:
Switching capacitors；And
Switch converters；
Wherein, the input port of the Switching capacitors and the switch converters is one of in series or in parallel
Be connected with each other, output port in series or in parallel in another be connected with each other.
2. DC-to-dc converter according to claim 1, which is characterized in that Switching capacitors and described
The input port of switch converters is connected in series and output port is connected in parallel.
3. DC-to-dc converter according to claim 1, which is characterized in that Switching capacitors and described
The input port of switch converters is connected in parallel and output port is connected in series.
4. DC-to-dc converter according to claim 1, which is characterized in that the Switching capacitors are isolation
Type Switching capacitors or non-isolation type Switching capacitors.
5. DC-to-dc converter according to claim 1, which is characterized in that Switching capacitors and described
Switch converters are configured to carry out the converter of bi-directional power conversion, so that the DC-to-dc converter can
Carry out bidirectional modulation.
6. DC-to-dc converter according to claim 1, which is characterized in that the switch converters are opened up for booster type
It flutters, buck topology, buck-boost type topology, Zeta topology, Sepic topology, the transformation of Cuk topology, inverse excitation type converter, positive activation type
Device, push-pull converter, half bridge converter, full-bridge converter and LLC converter it is any.
7. DC-to-dc converter according to claim 1, which is characterized in that the Switching capacitors include:
N number of first capacitor has first end interconnected；
N number of second capacitor is sequentially connected in series input port and the switch converters in the Switching capacitors
Between input port, or it is connected in series in the output port of the Switching capacitors and the output of the switch converters
Between port；
N number of first switch group, each first switch group is for the second end of corresponding first capacitor to be selectively connected
To the first end or second end of corresponding second capacitor；And
Second switch group, for N number of first capacitor first end interconnected to be used to selectively connect to the first of output port
End or second end or second switch group are for N number of first capacitor first end interconnected to be used to selectively connect to input
The first end or second end of port；
Wherein, the first switch group and the controlled carry out state of the second switch group are switched so that the DC-DC turns
The output voltage and input voltage of parallel operation are proportional, wherein N is the natural number not less than 1.
8. DC-to-dc converter according to claim 7, which is characterized in that the Switching capacitors further include:
At least one isolation capacitance is connected to the either end and described N number of second of the output port of the Switching capacitors
Between any end of capacitance connection, or be connected to the input port of the Switching capacitors either end and the N
Between any end of a second capacitance connection.
9. DC-to-dc converter according to claim 7, which is characterized in that each first switch group and described
Second switch group is the half-bridge circuit for including first switch and the second switch, wherein the first switch and the second switch
Switch state be complementary state.
10. DC-to-dc converter according to claim 1, which is characterized in that the switch converters include:
Output capacitance is connected to the both ends of the output port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820866552.4U CN208241576U (en) | 2018-06-04 | 2018-06-04 | DC-to-DC converter |
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| CN201820866552.4U CN208241576U (en) | 2018-06-04 | 2018-06-04 | DC-to-DC converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108539981A (en) * | 2018-06-04 | 2018-09-14 | 南京矽力杰半导体技术有限公司 | DC-to-DC converter |
| CN111293882A (en) * | 2019-01-28 | 2020-06-16 | 展讯通信（上海）有限公司 | Step-up/step-down circuit and control method |
-
2018
- 2018-06-04 CN CN201820866552.4U patent/CN208241576U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108539981A (en) * | 2018-06-04 | 2018-09-14 | 南京矽力杰半导体技术有限公司 | DC-to-DC converter |
| CN111293882A (en) * | 2019-01-28 | 2020-06-16 | 展讯通信（上海）有限公司 | Step-up/step-down circuit and control method |
| CN111293882B (en) * | 2019-01-28 | 2021-07-23 | 展讯通信（上海）有限公司 | Step-up/step-down circuit and control method |
| US11799376B2 (en) | 2019-01-28 | 2023-10-24 | Spreadtrum Communications (Shanghai) Co., Ltd. | Buck-boost circuit and control method |
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