CN107565812A - A kind of DC/DC converters and energy capturing systems - Google Patents
A kind of DC/DC converters and energy capturing systems Download PDFInfo
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Abstract
The invention discloses a kind of DC/DC converters, applied to energy capturing systems, energy capturing systems include power module and rectifier, and the DC/DC converters include oscillator module and electric charge pump module, oscillator module includes the first inductance, second inductance, the 3rd inductance, the 4th inductance, first electric capacity, first gate-controlled switch, the second gate-controlled switch, the clock signal output that electric charge pump module is provided by oscillator module make the supply voltage of load normal work.The starting of oscillation voltage of DC/DC converters provided by the invention is relatively low, and is easily integrated, and has saved the cost of energy harvesting to a certain extent.The invention also discloses a kind of energy capturing systems, have above-mentioned beneficial effect.
Description
Technical field
The present invention relates to energy harvesting field, more particularly to a kind of DC/DC converters and energy capturing systems.
Background technology
As electronic circuit comes into the epoch being powered using microwatts power at present, corresponding energy obtains
Technology is taken to start to obtain social attention.Energy capturing systems include power module, rectifier and DC/DC converters at present, wherein,
The alternating current that power module exports is converted to direct current by rectifier, then is exported and given DC/DC converters, so as to DC/DC converters
Output voltage after rectifier rectification is converted to stable load supplying voltage, due to the power module in energy capturing systems
Generally microwave and vibration source etc., output voltage is generally relatively low, and the output voltage after rectifier rectification is not enough to start DC/
DC converters, so the clock typically needed in traditional DC/DC converters using mechanical assistance switch in place, turns DC/DC
Parallel operation can also start in the case of low input.
But the mechanical assistance switch in DC/DC converters is difficult to integrate, and limits the applicable sky of DC/DC converters
Between, while mechanical assistance switch cost is higher, improves the cost of energy harvesting to a certain extent.
Therefore, how to provide a kind of scheme for solving above-mentioned technical problem is that those skilled in the art need to solve at present
Problem.
The content of the invention
It is an object of the invention to provide a kind of DC/DC converters, applied to energy capturing systems, it is easily integrated, certain
The cost of energy harvesting has been saved in degree；It is a further object of the present invention to provide a kind of energy capturing systems.
In order to solve the above technical problems, the invention provides a kind of DC/DC converters, applied to energy capturing systems, institute
Stating energy capturing systems includes power module and rectifier, and the DC/DC converters include oscillator module and electric charge pump module, institute
Stating oscillator module includes the first inductance, the second inductance, the 3rd inductance, the 4th inductance, the first electric capacity, the first gate-controlled switch, and
Two gate-controlled switches, wherein：
The first end of first inductance connects with the first end of second inductance, its common port and the rectifier
Output end connects, the second end of first inductance first end with first electric capacity, first gate-controlled switch respectively
First end and the connection of the control terminal of second gate-controlled switch, the second end of second inductance respectively with first electric capacity
Second end, the first end of second gate-controlled switch and first gate-controlled switch control terminal connection, its common port respectively with
The first input end of the electric charge pump module connects with the second input of the electric charge pump module, first gate-controlled switch
Second end is connected with the first end of the 3rd inductance, and the second end of the 3rd inductance is connected to ground, and described second controllable opens
The second end closed is connected with the first end of the 4th inductance, and the second end of the 4th inductance is connected to ground, the charge pump
The output end of module connects with the power end of load；
The clock signal output that the electric charge pump module is provided by the oscillator module makes the load normal work
Supply voltage.
Preferably, the electric charge pump module includes the first positive gate-controlled switch, the first negative gate-controlled switch, the first positive electric capacity, and
One negative capacitance, the first positive boost module, the second positive boost module is until the positive boost modules of N, and the first negative boost module, second is negative
Boost module bears boost module up to N, wherein：
The first end with the described first positive boost module, described second be just respectively for the first end of the first positive gate-controlled switch
The first end of boost module is until the first end of the positive boost modules of N connects, and its common port is as the electric charge pump module
First input end, the second end of the first positive gate-controlled switch respectively with the first end of the described first positive electric capacity and described first
The second end connection of positive boost module, the second end of the first positive electric capacity respectively with the described first positive boost module the 3rd
End, the 3rd end of the second positive boost module are until the 3rd end of the positive boost modules of N and ground connection, the i-th positive boosting
4th end of module connects with the second end of the positive boost module of i+1, and the 4th end of the positive boost modules of N is as the electricity
The output end of lotus pump module, wherein, i=1,2 ..., N-1；
Second end of the first negative gate-controlled switch first end with the described first negative boost module, described second negative respectively
The first end of boost module is until the N bears the first end connection of boost module, and its common port is as the electric charge pump module
The second input, the first end of the first negative gate-controlled switch respectively with the first end of first negative capacitance and described first
The second end connection of negative boost module, the second end of first negative capacitance the 3rd end with the first negative boost module, institute respectively
The 3rd end of the second negative boost module is stated until the N bears the 3rd end of boost module and ground connection, jth bear boost module
4th end connects with the second end of the negative boost module of jth+1, and the N bears the 4th end of boost module as the charge pump mould
The output end of block, wherein, j=1,2 ..., N-1.
Preferably, the positive boost modules of α include positive boost capacitor Cuα, the second positive gate-controlled switch VT2α, the 3rd just controllable opens
Close VT3α, positive output electric capacity COα；β, which bears boost module, includes negative boost capacitor Cuβ, the second negative gate-controlled switch VT2β, the 3rd it is negative can
Control switch VT3β, negative output electric capacity COβ, α=1,2 ..., N, β=1,2 ..., N, wherein：
The positive boost capacitor CuαFirst end of the first end as the positive boost modules of α, the positive boost capacitor
CuαThe second end respectively with the described second positive gate-controlled switch VT2αThe second end and the 3rd positive gate-controlled switch VT3αFirst end
Connection, the second positive gate-controlled switch VT2αSecond end of the first end as the positive boost modules of α, the described 3rd just may be used
Control switch VT3αThe second end and the positive output electric capacity COαFirst end connection, its common port just boosts mould as the α
4th end of block, the positive output electric capacity COαThreeth end of second end as the positive boost modules of α；
The negative boost capacitor CuβFirst end as the β bear boost module first end, the negative boost capacitor
CuβThe second end respectively with the described second negative gate-controlled switch VT2βFirst end and the 3rd negative gate-controlled switch VT3βThe second end
Connection, the second negative gate-controlled switch VT2βThe second end as the β bear boost module the second end, the described 3rd it is negative can
Control switch VT3βFirst end and the negative output electric capacity COβFirst end connection, its common port is as the negative boosting moulds of the β
4th end of block, the negative output electric capacity COβThe second end as the β bear boost module the 3rd end.
Preferably, the described second positive gate-controlled switch VT2α, the 3rd positive gate-controlled switch VT3α, described second negative controllable opens
Close VT2βWith the described 3rd negative gate-controlled switch VT3βIt is PMOS, wherein：
The drain electrode of the PMOS is as the described second positive gate-controlled switch VT2αFirst end, the 3rd positive gate-controlled switch
VT3αFirst end, the second negative gate-controlled switch VT2βFirst end and the 3rd negative gate-controlled switch VT3βFirst end, institute
The grid for stating PMOS connects with substrate, and its common port is as the described second positive gate-controlled switch VT2αThe second end, the described 3rd just
Gate-controlled switch VT3αThe second end, the second negative gate-controlled switch VT2βThe second end and the 3rd negative gate-controlled switch VT3β
Two ends.
Preferably, first gate-controlled switch is the first NMOS tube, and second gate-controlled switch is the second NMOS tube, its
In：
Control terminal of the grid of first NMOS tube as first gate-controlled switch, the drain electrode of first NMOS tube
As the first end of first gate-controlled switch, the source electrode of first NMOS tube as first gate-controlled switch second
End；
Control terminal of the grid of second NMOS tube as second gate-controlled switch, the drain electrode of second NMOS tube
As the first end of second gate-controlled switch, the source electrode of second NMOS tube as second gate-controlled switch second
End.
Preferably, N 4.
Preferably, the breadth length ratio of the PMOS is 200.
Preferably, the capacitance of the positive boost capacitor Cu α is 200pF；The capacitance of the negative boost capacitor Cu β is equal
For 200pF.
In order to solve the above technical problems, present invention also offers a kind of energy capturing systems, including such as above-mentioned any one
Described DC/DC converters.
The invention provides a kind of DC/DC converters, and applied to energy capturing systems, energy capturing systems include power supply mould
Block and rectifier, the DC/DC converters include oscillator module and electric charge pump module, and oscillator module includes the first inductance, the
Two inductance, the 3rd inductance, the 4th inductance, the first electric capacity, the first gate-controlled switch, the second gate-controlled switch, wherein：The of first inductance
One end connects with the first end of the second inductance, the output end connection of its common port and rectifier, the second end difference of the first inductance
The first end of first end, the first gate-controlled switch and the control terminal of the second gate-controlled switch with the first electric capacity connect, the second inductance
The control terminal at the second end the second end with the first electric capacity, the first end of the second gate-controlled switch and the first gate-controlled switch respectively is connected,
Its common port is connected with the first input end of electric charge pump module and the second input of electric charge pump module respectively, the first gate-controlled switch
The second end be connected with the first end of the 3rd inductance, the second end of the 3rd inductance is connected to ground, the second end of the second gate-controlled switch
It is connected with the first end of the 4th inductance, the second end of the 4th inductance is connected to ground, the output end of electric charge pump module and the electricity of load
Source connects；The clock signal output that electric charge pump module is provided by oscillator module makes the supply voltage of load normal work.
It can be seen that in actual applications, the electric charge pump module in DC/DC converters provided by the present invention passes through oscillator mould
The clock signal output that block provides can make the supply voltage of load normal work, the structure of oscillator module provided by the invention
With time-varying response characteristic, including feedback arrangement, its output voltage swing is set to be higher than power level and less than ground electricity
It is flat, and starting of oscillation voltage is relatively low, circuit size is relatively small, is easily integrated, and has saved the cost of energy harvesting to a certain extent.
Present invention also offers a kind of energy capturing systems, have and above-mentioned DC/DC converters identical beneficial effect.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to institute in prior art and embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of structural representation of DC/DC converters provided by the present invention；
Fig. 2 is a kind of another structural representation of DC/DC converters provided by the present invention；
Fig. 3 is a kind of structural representation of single stage charge pump provided by the present invention；
Fig. 4 is a kind of threshold voltage tendency chart of PMOS provided by the present invention.
Embodiment
The core of the present invention is to provide a kind of DC/DC converters, applied to energy capturing systems, is easily integrated, certain
The cost of energy harvesting has been saved in degree；Another core of the present invention is to provide a kind of energy capturing systems.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is refer to, Fig. 1 is a kind of structural representation of DC/DC converters provided by the present invention, is obtained applied to energy
System is taken, energy capturing systems include power module and rectifier, and the DC/DC converters include oscillator module 1 and charge pump
Module 2, oscillator module 1 include the first inductance L1, the second inductance L2, the 3rd inductance L3, the 4th inductance L4, the first electric capacity C1, the
One gate-controlled switch VT1, the second gate-controlled switch VT2, wherein：
First inductance L1First end and the second inductance L2First end connection, the output end of its common port and rectifier connects
Connect, the first inductance L1The second end respectively with the first electric capacity C1First end, the first gate-controlled switch VT1First end and second can
Control switch VT2Control terminal connection, the second inductance L2The second end respectively with the first electric capacity C1The second end, the second gate-controlled switch
VT2First end and the first gate-controlled switch VT1Control terminal connection, its common port first input end with electric charge pump module 2 respectively
Connected with the second input of electric charge pump module 2, the first gate-controlled switch VT1The second end and the 3rd inductance L3First end connection,
3rd inductance L3The second end be connected to ground, the second gate-controlled switch VT2The second end and the 4th inductance L4First end connection, the
Four inductance L4The second end be connected to ground, the output end of electric charge pump module 2 connects with the power end of load；
The clock signal output that electric charge pump module 2 is provided by oscillator module 1 makes the supply voltage of load normal work.
Specifically, this programme provides the two-phase sinusoidal clock signal of a self-starting to charge pump mould by oscillator module 1
Block 2, the supply voltage of load normal work can be made to control electric charge pump module 2 to export.Oscillator mould provided by the present invention
Block 1, there are time-varying individual features in structure, its noise-phase noise transfer function is determined by time-varying response characteristic, in addition should
The structure of oscillator module 1 is a kind of feedback arrangement again, can be phase noise by noise transition seldom in active device, can be with
Phase-noise case is preferably improved, and the output voltage swing of oscillator module 1 can be higher than power level and less than ground electricity
Flat, starting of oscillation voltage is relatively low, when the input voltage of oscillator module 1 is tens millivolts, the oscillator module 1 can starting of oscillation, enter
One step ensure that DC/DC converters provided by the invention can start in the case of low input.Illustrate, it is assumed that shake
The input voltage for swinging device module 1 is 90mv, when signal frequency is 50Hz, output voltage swing 350mV.
The invention provides a kind of DC/DC converters, and applied to energy capturing systems, energy capturing systems include power supply mould
Block and rectifier, the DC/DC converters include oscillator module and electric charge pump module, and oscillator module includes the first inductance, the
Two inductance, the 3rd inductance, the 4th inductance, the first electric capacity, the first gate-controlled switch, the second gate-controlled switch, wherein：The of first inductance
One end connects with the first end of the second inductance, the output end connection of its common port and rectifier, the second end difference of the first inductance
The first end of first end, the first gate-controlled switch and the control terminal of the second gate-controlled switch with the first electric capacity connect, the second inductance
The control terminal at the second end the second end with the first electric capacity, the first end of the second gate-controlled switch and the first gate-controlled switch respectively is connected,
Its common port is connected with the first input end of electric charge pump module and the second input of electric charge pump module respectively, the first gate-controlled switch
The second end be connected with the first end of the 3rd inductance, the second end of the 3rd inductance is connected to ground, the second end of the second gate-controlled switch
It is connected with the first end of the 4th inductance, the second end of the 4th inductance is connected to ground, the output end of electric charge pump module and the electricity of load
Source connects；The clock signal output that electric charge pump module is provided by oscillator module makes the supply voltage of load normal work.
It can be seen that in actual applications, the electric charge pump module in DC/DC converters provided by the present invention passes through oscillator mould
The clock signal output that block provides can make the supply voltage of load normal work, the structure of oscillator module provided by the invention
With time-varying response characteristic, including feedback arrangement, its output voltage swing is set to be higher than power level and less than ground electricity
It is flat, and starting of oscillation voltage is relatively low, circuit size is relatively small, is easily integrated, and has saved the cost of energy harvesting to a certain extent.
It refer to Fig. 2, Fig. 2 is a kind of another structural representation of DC/DC converters provided by the present invention, the DC/
DC converters are on the basis of above-described embodiment：
As a kind of preferred embodiment, electric charge pump module 2 includes the first positive gate-controlled switch+VT1, first negative controllable opens
Pass-VT1, the first positive electric capacity+C1, the first negative capacitance-C1, the first positive boost module, the second positive boost module is until N just boosts
Module, the first negative boost module, the second negative boost module bear boost module up to N, wherein：
First positive gate-controlled switch+VT1The first end first end with the first positive boost module, the second positive boost module respectively
First end until the first end of the positive boost modules of N connects, first input end of its common port as electric charge pump module 2, the
One positive gate-controlled switch+VT1The second end respectively with the first positive electric capacity+C1First end and the first positive boost module the second end connect
Connect, the 3rd end with the first positive boost module, the 3rd end of the second positive boost module are straight respectively at the first positive electric capacity+C1 the second end
Connected to the 3rd end of the positive boost modules of N and ground, the 4th end of the i-th positive boost module and the second of the positive boost module of i+1
End connection, the output end of the 4th end of the positive boost modules of N as electric charge pump module 2, wherein, i=1,2 ..., N-1；
First negative gate-controlled switch-VT1The second end first end with the first negative boost module, the second negative boost module respectively
First end until N bears the first end connection of boost module, second input of its common port as electric charge pump module 2, the
One negative gate-controlled switch-VT1First end respectively with the first negative capacitance-C1First end and the first negative boost module the second end connect
Connect, the first negative capacitance-C1The 3rd end with the first negative boost module, the 3rd end of the second negative boost module are straight respectively at the second end
The 3rd end and the ground connection of boost module, the 4th end of the negative boost module of jth and the second of the negative boost module of jth+1 are born to N
End connection, N bear output end of the 4th end of boost module as electric charge pump module 2, wherein, j=1,2, N-1.
Specifically, in order that DC/DC converters output voltage maximize, can be by increasing the series of electric charge pump module 2
Method realize that and in DC/DC converters provided by the present invention, positive output voltage and negative sense output voltage can be from
Extracted in electric charge pump module 2, therefore available output voltage will double.
Specifically, in the structure of electric charge pump module 2 provided by the present invention, often increase a positive boost module and one
Negative boost module, then can be regarded as electric charge pump module 2 increases one-level, and the present invention is not limited the series of electric charge pump module 2, institute
The number of boost module in electric charge pump module 2 is not also limited with the present invention.
As a kind of preferred embodiment, the positive boost modules of α include positive boost capacitor+Cuα, the second positive gate-controlled switch+
VT2α, the 3rd positive gate-controlled switch+VT3α, positive output electric capacity+COα；β, which bears boost module, includes negative boost capacitor-Cuβ, second it is negative can
Control switch-VT2β, the 3rd negative gate-controlled switch-VT3β, negative output electric capacity-COβ, α=1,2 ..., N, β=1,2 ..., N, wherein：
Positive boost capacitor+CuαFirst end of the first end as the positive boost modules of α, positive boost capacitor+CuαThe second end
Respectively with the second positive gate-controlled switch+VT2αThe second end and the 3rd positive gate-controlled switch+VT3αFirst end connection, second is just controllable
Switch+VT2αSecond end of the first end as the positive boost modules of α, the 3rd positive gate-controlled switch+VT3αThe second end and positive output
Electric capacity+COαFirst end connection, fourth end of its common port as the positive boost modules of α, positive output electric capacity+COαThe second end
The 3rd end as the positive boost modules of α；
Negative boost capacitor-CuβFirst end the first end of boost module is born as β, bear boost capacitor-CuβThe second end
Respectively with the second negative gate-controlled switch-VT2βFirst end and the 3rd negative gate-controlled switch-VT3βThe second end connection, second is negative controllable
Switch-VT2βThe second end as β bear boost module the second end, the 3rd negative gate-controlled switch-VT3βFirst end and negative output
Electric capacity-COβFirst end connection, its common port as β bear boost module the 4th end, negative output electric capacity-COβThe second end
The 3rd end of boost module is born as β.
Specifically, single stage charge pump structure is as shown in figure 3, its operation principle alternatively represents positive/negative boost module
Operation principle, specific work process is as follows：In input voltage VinPositive half period, output capacitance COIt is electrically charged, with output electricity
Hold COSecond gate-controlled switch VT of series connection12Ensure output capacitance COCharging process, prevent reverse direction current flow；Work as input voltage
VinWhen being down to zero crossing, Vx=Vi-1-Vth, work as VinWhen reaching maximum negative value, due to boost capacitor CUEffect, VxCan be than it
Preceding increase 2Vin, i.e. Vx=2 × Vin+Vn-1-Vth, therefore output capacitance COPass through the 3rd gate-controlled switch VT13V can be charged tox-
Vth, output capacitance COThe voltage at both ends is up to Vi=Vi-1+2Vin-2Vth, similarly understand, the series of electric charge pump module 2 is increased
More, the output voltage of electric charge pump module 2 will be bigger, and ensure that the DC/DC converters can export makes load normal work
Supply voltage.
As a kind of preferred embodiment, the second positive gate-controlled switch+VT2α, the 3rd positive gate-controlled switch+VT3α, second it is negative can
Control switch-VT2βWith the 3rd negative gate-controlled switch-VT3βIt is PMOS, wherein：
The drain electrode of PMOS is as the second positive gate-controlled switch+VT2αFirst end, the 3rd positive gate-controlled switch+VT3αFirst
End, the second negative gate-controlled switch-VT2βFirst end and the 3rd negative gate-controlled switch-VT3βFirst end, the grid and substrate of PMOS
Connection, its common port is as the second positive gate-controlled switch+VT2αThe second end, the 3rd positive gate-controlled switch+VT3αThe second end, second
Negative gate-controlled switch-VT2βThe second end and the 3rd negative gate-controlled switch-VT3βThe second end.
Specifically, the grid and substrate of PMOS link together, by relational expressionUnderstand, wherein, VTHFor the cut-in voltage of PMOS, γ is body-effect coefficient, this
Kind connected mode has dynamically changed the threshold voltage of PMOS.Shown in reference picture 4, when the structure input voltage forward direction, threshold
Threshold voltage reduces, i.e., the conducting voltage of electric charge pump module 2 reduces, and when inverted, threshold voltage raises, and electric charge pump module 2 is reverse
Electric leakage reduce, so as to so that electric charge pump module 2 it is more efficient.
It should be understood that the input voltage of electric charge pump module 2 is influenceed relatively low, the structure of above-mentioned PMOS by supply voltage
It is more suitable for the situation of low input.
As a kind of preferred embodiment, the first gate-controlled switch is the first NMOS tube, and the second gate-controlled switch is the 2nd NMOS
Pipe, wherein：
Control terminal of the grid of first NMOS tube as the first gate-controlled switch, the drain electrode of the first NMOS tube are controllable as first
The first end of switch, the second end of the source electrode of the first NMOS tube as the first gate-controlled switch；
Control terminal of the grid of second NMOS tube as the second gate-controlled switch, the drain electrode of the second NMOS tube are controllable as second
The first end of switch, the second end of the source electrode of the second NMOS tube as the second gate-controlled switch.
Specifically, NMOS tube is N-channel MOS pipe, technique is simple, cheap, and area is small, and further ensuring will not
Increase chip area.
Except that can be that NMOS tube can also be other transistors, the present invention limit certain gate-controlled switch herein.
As a kind of preferred embodiment, N 4.
Specifically, although in order that the output voltage of DC/DC converters reaches maximization and can take increase charge pump mould
The series of block 2, i.e., realized by increasing the number of positive boost module and negative boost module, but increase charge pump series to cause
The power and conversion efficiency of whole DC/DC converters reduce, while can also increase the size of DC/DC converters, and the present invention is entering
Being found after the multiple circuit simulation of row, the electric charge pump module 2 of level Four is a preferably compromise on output voltage and circuit efficiency,
Therefore, the present invention uses level Four electric charge pump module.
Certainly, except level Four electric charge pump module can be used, it can also be other levels, need to determine according to actual circuit,
The present invention does not limit herein.
As a kind of preferred embodiment, the breadth length ratio of PMOS is 200.
Specifically, the maximum work that the size issue and guarantee PMOS in view of DC/DC converter sizes can obtain
Rate efficiency, the size of PMOS should compromise between low parasitic, low threshold voltage and low pass road resistivity, therefore, the present invention
The PMOS that the PMOS used is 200 for breadth length ratio.
Certainly, except the PMOS that breadth length ratio is 200 can be selected, the PMOS of other sizes, this hair can also be selected
It is bright not limit herein.
As a kind of preferred embodiment, positive boost capacitor+CuαValue be 200pF；Negative boost capacitor-CuβValue it is equal
For 200pF.
Specifically, in view of the size issue of DC/DC converter sizes, the capacitance of positive and negative boost capacitor should be in chip
Compromise between area and single-stage maximum output voltage, by test of many times, the present invention uses electric capacity conduct of the capacitance for 200pF
Positive boost capacitor+CuαAnd negative boost capacitor-CuβCapacitance.
Certainly, positive boost capacitor+CuαWith negative boost capacitor-CuβCapacitance except that can be 200pF, can also be it
His numerical value, the present invention do not limit herein.
Present invention also offers a kind of energy capturing systems, including the DC/DC converters such as above-mentioned any one.
Above-described embodiment is refer to for a kind of introduction of energy capturing systems provided by the present invention, and the present invention is herein not
Repeat again.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (9)
1. a kind of DC/DC converters, applied to energy capturing systems, the energy capturing systems include power module and rectification
Device, it is characterised in that the DC/DC converters include oscillator module and electric charge pump module, and the oscillator module includes first
Inductance, the second inductance, the 3rd inductance, the 4th inductance, the first electric capacity, the first gate-controlled switch, the second gate-controlled switch, wherein：
The first end of first inductance connects with the first end of second inductance, the output of its common port and the rectifier
End connection, the second end of first inductance first end with first electric capacity, the first of first gate-controlled switch respectively
The connection of the control terminal of end and second gate-controlled switch, the second end of second inductance respectively with first electric capacity second
End, the control terminal connection of the first end of second gate-controlled switch and first gate-controlled switch, its common port respectively with it is described
The first input end of electric charge pump module connects with the second input of the electric charge pump module, and the second of first gate-controlled switch
End is connected with the first end of the 3rd inductance, and the second end of the 3rd inductance is connected to ground, second gate-controlled switch
Second end is connected with the first end of the 4th inductance, and the second end of the 4th inductance is connected to ground, the electric charge pump module
Output end with load power end connect；
The clock signal output that the electric charge pump module is provided by the oscillator module makes the confession of the load normal work
Piezoelectric voltage.
2. DC/DC converters according to claim 1, it is characterised in that it is just controllable that the electric charge pump module includes first
Switch, the first negative gate-controlled switch, the first positive electric capacity, the first negative capacitance, the first positive boost module, the second positive boost module is until the
The positive boost modules of N, the first negative boost module, the second negative boost module bear boost module up to N, wherein：
The first end with the described first positive boost module, the second positive boosting respectively of the first end of the first positive gate-controlled switch
The first end of module until the first end of the positive boost modules of N connects, its common port as the electric charge pump module the
One input, the second end of the first positive gate-controlled switch are just rising with the first end of the described first positive electric capacity and described first respectively
The second end connection of die block, the second end of the first positive electric capacity the 3rd end with the described first positive boost module, institute respectively
State the second positive boost module the 3rd end until the positive boost modules of N the 3rd end and ground connection, the i-th positive boost module
4th end connects with the second end of the positive boost module of i+1, and the 4th end of the positive boost modules of N is as the charge pump mould
The output end of block, wherein, i=1,2 ..., N-1；
The first end with the described first negative boost module, the second negative boosting respectively of second end of the first negative gate-controlled switch
The first end of module until the N bears the first end connection of boost module, its common port as the electric charge pump module the
Two inputs, the first end of the first negative gate-controlled switch first end with first negative capacitance and the first negative liter respectively
The second end connection of die block, the second end of first negative capacitance the 3rd end with the first negative boost module, described the respectively
3rd end of two negative boost modules is until the N bears the 3rd end of boost module and ground connection, jth bear the 4th of boost module
End connects with the second end of the negative boost module of jth+1, and the N bears the 4th end of boost module as the electric charge pump module
Output end, wherein, j=1,2 ..., N-1.
3. DC/DC converters according to claim 2, it is characterised in that the positive boost modules of α include positive boost capacitor
Cuα, the second positive gate-controlled switch VT2α, the 3rd positive gate-controlled switch VT3α, positive output electric capacity COα；β, which bears boost module, includes negative boosting
Electric capacity Cuβ, the second negative gate-controlled switch VT2β, the 3rd negative gate-controlled switch VT3β, negative output electric capacity COβ, α=1,2 ..., N, β=1,
2 ..., N, wherein：
The positive boost capacitor CuαFirst end of the first end as the positive boost modules of α, the positive boost capacitor Cuα's
Second end respectively with the described second positive gate-controlled switch VT2αThe second end and the 3rd positive gate-controlled switch VT3αFirst end connect
Connect, the second positive gate-controlled switch VT2αSecond end of the first end as the positive boost modules of α, the described 3rd is just controllable
Switch VT3αThe second end and the positive output electric capacity COαFirst end connection, its common port is as the positive boost modules of α
The 4th end, the positive output electric capacity COαThreeth end of second end as the positive boost modules of α；
The negative boost capacitor CuβFirst end as the β bear boost module first end, the negative boost capacitor Cuβ's
Second end respectively with the described second negative gate-controlled switch VT2βFirst end and the 3rd negative gate-controlled switch VT3βThe second end connect
Connect, the second negative gate-controlled switch VT2βThe second end as the β bear boost module the second end, the described 3rd is negative controllable
Switch VT3βFirst end and the negative output electric capacity COβFirst end connection, its common port as the β bear boost module
The 4th end, the negative output electric capacity COβThe second end as the β bear boost module the 3rd end.
4. DC/DC converters according to claim 3, it is characterised in that the second positive gate-controlled switch VT2α, described
Three positive gate-controlled switch VT3α, the second negative gate-controlled switch VT2βWith the described 3rd negative gate-controlled switch VT3βIt is PMOS, wherein：
The drain electrode of the PMOS is as the described second positive gate-controlled switch VT2αFirst end, the 3rd positive gate-controlled switch VT3α's
First end, the second negative gate-controlled switch VT2βFirst end and the 3rd negative gate-controlled switch VT3βFirst end, the PMOS
The grid of pipe connects with substrate, and its common port is as the described second positive gate-controlled switch VT2αThe second end, the described 3rd just controllable opens
Close VT3αThe second end, the second negative gate-controlled switch VT2βThe second end and the 3rd negative gate-controlled switch VT3βThe second end.
5. DC/DC converters according to claim 3, it is characterised in that first gate-controlled switch is the first NMOS tube,
Second gate-controlled switch is the second NMOS tube, wherein：
Control terminal of the grid of first NMOS tube as first gate-controlled switch, the drain electrode conduct of first NMOS tube
The first end of first gate-controlled switch, the second end of the source electrode of first NMOS tube as first gate-controlled switch；
Control terminal of the grid of second NMOS tube as second gate-controlled switch, the drain electrode conduct of second NMOS tube
The first end of second gate-controlled switch, the second end of the source electrode of second NMOS tube as second gate-controlled switch.
6. according to the DC/DC converters described in claim 1-5 any one, it is characterised in that N 4.
7. DC/DC converters according to claim 6, it is characterised in that the breadth length ratio of the PMOS is 200.
8. DC/DC converters according to claim 7, it is characterised in that the capacitance of the positive boost capacitor Cu α is
200pF；The capacitance of the negative boost capacitor Cu β is 200pF.
9. a kind of energy capturing systems, it is characterised in that including the DC/DC converters as described in claim 1-8 any one.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112003356A (en) * | 2019-05-10 | 2020-11-27 | X2 动力科技有限公司 | High-voltage hybrid charging system and method thereof |
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| CN101098104A (en) * | 2006-06-27 | 2008-01-02 | 中兴通讯股份有限公司 | Device for optimizing charge pump of integrated circuit and method therefor |
| CN101119065A (en) * | 2007-09-18 | 2008-02-06 | 钰创科技股份有限公司 | Charge pump control system |
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