CN103532376A - Power charge pump - Google Patents
Power charge pump Download PDFInfo
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- CN103532376A CN103532376A CN201310518255.2A CN201310518255A CN103532376A CN 103532376 A CN103532376 A CN 103532376A CN 201310518255 A CN201310518255 A CN 201310518255A CN 103532376 A CN103532376 A CN 103532376A
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Abstract
An embodiment of the invention provides a power charge pump which comprises an output capacitor, at least one flying capacitor, a first voltage source, a second voltage source, a first group of clock switches and a second groups of clock switches, wherein the first group of clock switches and the second group of clock switches comprise at least two clock switches respectively; conduction time of the first group of the clock switches and conduction time of the second groups of the clock switches are not overlapped; when the first group of the clock switches are conducted, the at least one flying capacitor is controlled to generate third voltage which is a difference of a first voltage of the first voltage source and second voltage of the second voltage source; and when the second groups of the clock switches are conducted, the output capacitor is controlled to generate output voltage in proportion to the third voltage. According to the power charge pump, more voltage modes generating more input voltage/output voltage multiplying power can be constructed, and optimization of the efficiency of the power charge pump is facilitated.
Description
Technical field
The present invention relates to electronic applications, be specifically related to a kind of power charge pump.
Background technology
Charge pump circuit based on switching capacity is widely used in voltage conversion circuit, can realize higher voltage transitions efficiency.Power charge pump of the prior art, generally adopts an input voltage, produces output voltage or the specific output low output voltage higher than input, and its efficiency is higher than linear voltage regulator.
The DC-to-DC converter of comparing based on inductance is compared, and power charge pump is without the larger inductance of volume, and it is more suitable for the less application in PCB space, and cost is lower.For desirable switch, its energy loss can be left in the basket, and in this case, can think that the efficiency of power charge pump circuit is 100%.But when power charge pump circuit can only be with some fixing multiplying power changing voltage, its ideal power is 100%.Yet such fixed multiplying power is limited several.In prior art, for only adopting in two application that fly electric capacity (flying capacitor), for same input voltage source, the VO/VIN(that can produce wherein VO is output voltage, and VIN is input voltage) multiplying power have: 3 times, 2 times, 3/2 times, 4/3 times, 1 times, 2/3 times, 1/2 times, 1/3 times.For only adopting one to fly electric capacity (flying capacitor) application, the VO/VIN multiplying power existing in prior art has: 2 times, 1 times, 1/2 times.
Adopt the mode that increases the number that flies electric capacity, can produce how possible multiplying power, but cost increases thereupon.Increase how possible multiplying power, be conducive to the real work efficiency of optimizing power charge pump.For example, input voltage is 3.3V, output voltage desired value is 1.7V, for only one fly electric capacity situation, can only adopt 1 times of pattern, produce 3.3V voltage, then by linear voltage regulation technology (linear voltage regulation technology can only reduce voltage), reduce to 1.7V, its efficiency is ideally 1.7V/3.3V=51.5%.For adopting two, fly electric capacity situation, can adopt 2/3 times of pattern, produce 2.2V voltage, then by linear voltage regulation technology, reduce to 1.7V, its efficiency is ideally 1.7V/2.2V=77.3%, has so just improved efficiency.For example, when input voltage changes within the specific limits (during powered battery, along with battery discharge or charging, its voltage can constantly change), more multiplying power patterns contribute to optimize the operating efficiency under different input voltages.Fly electric capacity more, help the more multiplying power patterns of generation, but cost is higher.As the less electric capacity that flies how, produce how possible multiplying power, be problem demanding prompt solution of the present invention.
Summary of the invention
The object of this invention is to provide a kind of power charge pump, to improve the utilization ratio that flies electric capacity in power charge pump.
For achieving the above object, embodiment of the present invention first aspect provides a kind of power charge pump, described power charge pump comprises an output capacitance, at least one electric capacity, the first voltage source and second voltage source and first group of clock switch and second group of clock switch of flying, each self-contained at least two clock switchs of described first, second clock switch, the ON time of described first group of clock switch and second group of clock switch is not overlapping;
During described first group of clock switch conducting, control described at least one tertiary voltage that electric capacity produces the difference of the first voltage of described the first voltage source and the second voltage in second voltage source that flies;
During described second group of clock switch conducting, control described output capacitance and produce output voltage proportional to tertiary voltage.
Based on first aspect, in the possible execution mode of the first, described power charge pump comprises one and flies electric capacity, and described first group of clock switch comprises the first clock switch and second clock switch, and described second group of clock switch comprises the 3rd clock switch and the 4th clock switch.
The possible execution mode of the first based on first aspect, in the possible execution mode of the second, described the first clock switch connect described the first voltage source positive pole and described in fly the first end of electric capacity, described second clock switch flies the second end of electric capacity and the positive pole in described second voltage source described in connecting, described in described the 3rd clock switch connects, fly the first paragraph of electric capacity and the first end of described output capacitance, described in described the 4th clock switch connects, fly the second end of the second end of electric capacity, described output capacitance and the negative pole of described first, second voltage source.
Based on first aspect, in the third possible execution mode, described power charge pump comprises first and flies electric capacity and second and fly electric capacity, described first group of clock switch comprises the first clock switch, second clock switch and the 5th clock switch, and described second group of clock switch comprises the 3rd clock switch, the 4th clock switch, the 6th clock switch and the 7th clock switch.
The third possible execution mode based on first aspect, in the 4th kind of possible execution mode, the positive pole and described first that described the first clock switch connects described the first voltage source flies the first end of electric capacity, described second clock switch connects described second and flies the second end of electric capacity and the positive pole in described second voltage source, described the 3rd clock switch connects described first and flies the first end of electric capacity and the first end of described output capacitance, described the 4th clock switch connects the described second the second end that flies electric capacity, the second end of described output capacitance and described first, the negative pole in second voltage source, described the 5th clock switch connects the first end that the described first the second end and described second that flies electric capacity flies electric capacity, described the 6th clock switch connects the described first the second end that flies electric capacity, the second end of described output capacitance and described first, the negative pole in second voltage source, described the 7th clock switch connects described second and flies the first end of electric capacity and the first end of described output capacitance.
Any one possible execution mode based on above, described the first voltage source is battery, described second voltage source is DC-to-DC converter or the linear voltage regulator in circuit.
Any one possible execution mode based on above, described first group of clock is subject to the first clock control, when the first clock is high level, described first group of clock conducting; Described second group of clock controlled by second clock, when second clock is high level, and described second group of clock conducting.
Any one possible execution mode based on above, interval very first time length between the ON time of described first group of clock and the ON time of described second group of clock.
The power charge pump providing by the embodiment of the present invention, can utilize other voltage existing in application system, design power charge pump, pass through utilization other voltages except cell voltage as second voltage source, build the voltage mode of the more input voltage/output voltages of more voluminous life multiplying power, contribute to optimizing power charge pump efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit theory diagrams of a kind of embodiment of a kind of power charge pump of providing of the embodiment of the present invention;
Fig. 2 is the first working state figure of the embodiment shown in Fig. 1;
Fig. 3 is the second working state figure of the embodiment shown in Fig. 1;
Fig. 4 is the circuit theory diagrams of the another kind of power charge pump that provides of the embodiment of the present invention;
Fig. 5 is the first working state figure of the embodiment shown in Fig. 4;
Fig. 6 is the second working state figure of the embodiment shown in Fig. 4.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The core concept of the embodiment of the present invention is, utilize more other voltages that exist in system, in systems such as panel computer, smart mobile phone, bluetooth earphone, be all equipped with Power Management Unit (Power Management Units), they can support plurality of voltages output conventionally, some is linear voltage regulator, some is DC-to-DC converter, by these as the second input voltage source and battery as the first voltage source, design power charge pump, build the voltage mode of more other multiplying powers, with optimizing power charge pump efficiency.
The embodiment of the present invention provides a kind of power charge pump, described power charge pump comprises an output capacitance, at least one electric capacity, the first voltage source and second voltage source and first group of clock switch and second group of clock switch of flying, each self-contained at least two clock switchs of described first, second clock switch, the ON time of described first group of clock switch and second group of clock switch is not overlapping; During described first group of clock switch conducting, control described at least one tertiary voltage that electric capacity produces the difference of the first voltage of described the first voltage source and the second voltage in second voltage source that flies; During described second group of clock switch conducting, control described output capacitance and produce output voltage proportional to tertiary voltage.
Wherein,, described first group of clock controlled by the first clock CK1, when CK1 is high level, described first group of clock conducting; Described second group of clock controlled by CK2, when CK2 is high level, and described second group of clock conducting.Interval very first time length between the ON time of the ON time of described first group of clock and described second group of clock.
As shown in Figure 1, in one embodiment, described power charge pump comprises one and flies capacitor C 1, and described first group of clock switch comprises the first clock switch S1 and second clock switch S 2, and described second group of clock switch comprises the 3rd clock switch S3 and the 4th clock switch S4.
Described S1 connect described the first voltage source V 1 positive pole and described in fly the first end of capacitor C 1, described S2 connects the second end of described C1 and the positive pole of described second voltage source V2, described S3 connects first end and the described output capacitance C of described C1
ofirst end, described S4 connects the second end of described C1, described C
othe second end and the negative pole of voltage source V 1 and V2.
Wherein, the first voltage source V 1 is generally the battery in circuit, and second voltage source can be the voltage follower circuits such as linear voltage regulator in circuit or DC-to-DC converter.
As shown in Figures 2 and 3, Fig. 2～Fig. 3 has described the specific works process of Fig. 1 execution mode.When CK1 is high level, corresponding diagram 2 operating states, switch S 1 and S2 conducting, switch S 3 and S4 disconnect.Burning voltage on electric capacity meets V
c1+ V2=V1, i.e. V
c1=V1-V2, wherein V
c1for flying the voltage at capacitor C 1 two ends, V1 is the magnitude of voltage of voltage source V 1, and V2 is the magnitude of voltage of voltage source V 2.Wherein, CK1 and CK2 are inversion clock signal, between there is not overlapping control, at switch S 1 and S2, close and have no progeny, postpone certain Dead Time, just conducting of switch S 3 and S4; Switch S 3 and S4 close to have no progeny, and postpone certain Dead Time, just conducting of switch S 1 and S2.
When CK2 is high level, corresponding diagram 3 operating states, switch S 1 and S2 disconnect, switch S 3 and S4 conducting.The burning voltage flying on electric capacity meets VC1=VO, wherein V
c1for the voltage at capacitor C 1 two ends, V
ovoltage for output capacitance Co two ends.
Under steady-working state, electric capacity both end voltage remains equal, V
c1=V
o=V1-V2, if VO=V2-V1 can be realized in the certain position of V1 and V2 in interchange graph 1.
The embodiment that Fig. 1 describes only has one to fly electric capacity (flying capacitor) situation, can build the Voltage-output that produces V1-V2.If V1=3.3V, export target magnitude of voltage is 1.7V, flies electric capacity situation to two, and adopting the optimum efficiency pattern of prior art is 2/3 times of pattern, and ideal efficiency is 1.7V/2.2V=77.3%; And only adopt one to fly electric capacity situation, and adopting the optimum efficiency pattern of prior art is 1 times of pattern, ideal efficiency is 1.7V/3.3V=51.5%.And employing the present invention, if V1=3.3V, V2=1.5V, ideal efficiency is 1.7V/ (3.3V-1.5V)=94.4%, and only with one, flies electric capacity, has greatly improved circuit utilization ratio.
As shown in Figure 4, at another kind, be in example, described power charge pump comprises first and flies capacitor C 1 and second and fly capacitor C 2, described first group of clock switch comprises the first clock switch S1, second clock switch S 2 and the 5th clock switch S5, and described second group of clock switch comprises the 3rd clock switch S3, the 4th clock switch S4, the 6th clock switch S6 and the 7th clock switch S7.
Described S1 connects described first positive pole of voltage source V 1 and the first end of described C1, and described S2 connects the second end of described C2 and the positive pole of described second voltage source V2, and described S3 connects first end and the described C of described C1
ofirst end, described S4 connects the second end of described C2, described C
othe second end and the negative pole of described voltage source V 1, V2, described S5 connects the second end of described C1 and the first end of described C2, described S6 connects the second end of described C1, described C
othe second end and the negative pole of described voltage source V 1, V2; Described S7 connects first end and the described C of described C2
ofirst end.
Similar with the embodiment shown in Fig. 1, the first voltage source V 1 is generally the battery in circuit, and second voltage source can be the voltage follower circuits such as linear voltage regulator in circuit or DC-to-DC converter.
Fig. 5～Fig. 6 has described the specific works process of Fig. 4 execution mode, when CK1 is high level, as shown in Figure 5, and switch S 1, S2, S5 conducting, switch S 3, S4, S6, S7 disconnect.Capacitance voltage meets:
V
C1+V
C2+V2=V1 (1)
V wherein
c1for the voltage at capacitor C 1 two ends, V
c2for the voltage at capacitor C 2 two ends, V1 is the magnitude of voltage of voltage source V 1, and V2 is the magnitude of voltage of voltage source V 2.
When CK2 is high level, as shown in Figure 6, switch S 1, S2, S5 disconnect, switch S 3, S4, S6, S7 conducting.Capacitance voltage meets:
V
C1=V
C2=V
O (2)
Wherein, V
c1for the voltage at capacitor C 1 two ends, V
c2for the voltage at capacitor C 2 two ends, V
omagnitude of voltage for output capacitance two ends.
Under stable state, the voltage at electric capacity two ends equates.Known according to formula (1) and (2):
V
O=(V1-V2)/2
The second execution mode of describing by Fig. 4, adopts two to fly capacitor C 1 and C2.The output voltage that can produce equals (V1-V2)/2.
The power charge pump providing by the embodiment of the present invention, can utilize other voltage existing in application system, design power charge pump, pass through utilization other voltages except cell voltage as second voltage source, build the voltage mode of the more input voltage/output voltages of more voluminous life multiplying power, contribute to optimizing power charge pump efficiency.
Be understandable that, can also, according to the core concept of the embodiment of the present invention, by designing more clock switch and flying electric capacity, to produce the output voltage of more multiplying powers, at this, seldom repeat.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a power charge pump, it is characterized in that, comprise an output capacitance, at least one electric capacity, the first voltage source and second voltage source and first group of clock switch and second group of clock switch of flying, each self-contained at least two clock switchs of described first, second clock switch, the ON time of described first group of clock switch and second group of clock switch is not overlapping;
During described first group of clock switch conducting, control described at least one tertiary voltage that electric capacity produces the difference of the first voltage of described the first voltage source and the second voltage in second voltage source that flies;
During described second group of clock switch conducting, control described output capacitance and produce output voltage proportional to tertiary voltage.
2. power charge pump as claimed in claim 1, it is characterized in that, described power charge pump comprises one and flies electric capacity, and described first group of clock switch comprises the first clock switch and second clock switch, and described second group of clock switch comprises the 3rd clock switch and the 4th clock switch.
3. power charge pump as claimed in claim 2, it is characterized in that, described the first clock switch connect described the first voltage source positive pole and described in fly the first end of electric capacity, described second clock switch flies the second end of electric capacity and the positive pole in described second voltage source described in connecting, described in described the 3rd clock switch connects, fly the first paragraph of electric capacity and the first end of described output capacitance, described in described the 4th clock switch connects, fly the second end of the second end of electric capacity, described output capacitance and the negative pole of described first, second voltage source.
4. power charge pump as claimed in claim 1, it is characterized in that, described power charge pump comprises first and flies electric capacity and second and fly electric capacity, described first group of clock switch comprises the first clock switch, second clock switch and the 5th clock switch, and described second group of clock switch comprises the 3rd clock switch, the 4th clock switch, the 6th clock switch and the 7th clock switch.
5. power charge pump as claimed in claim 4, it is characterized in that, the positive pole and described first that described the first clock switch connects described the first voltage source flies the first end of electric capacity, described second clock switch connects described second and flies the second end of electric capacity and the positive pole in described second voltage source, described the 3rd clock switch connects described first and flies the first end of electric capacity and the first end of described output capacitance, described in connecting, described the 4th clock switch flies the second end of electric capacity, the second end of described output capacitance and described first, the negative pole in second voltage source, described the 5th clock switch connects the first end that the described first the second end and described second that flies electric capacity flies electric capacity, described the 6th clock switch connects the described first the second end that flies electric capacity, the second end of described output capacitance and described first, the negative pole in second voltage source, described the 7th clock switch connects described second and flies the first end of electric capacity and the first end of described output capacitance.
6. the power charge pump as described in claim 1 to 5 any one, is characterized in that, described the first voltage source is battery, and described second voltage source is DC-to-DC converter or the linear voltage regulator in circuit.
7. the power charge pump as described in claim 1 to 6 any one, is characterized in that, described first group of clock is subject to the first clock control, when the first clock is high level, and described first group of clock conducting; Described second group of clock controlled by second clock, when second clock is high level, and described second group of clock conducting.
8. power charge pump as claimed in claim 7, is characterized in that, interval very first time length between the ON time of described first group of clock and the ON time of described second group of clock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310518255.2A CN103532376B (en) | 2013-10-28 | power charge pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310518255.2A CN103532376B (en) | 2013-10-28 | power charge pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103532376A true CN103532376A (en) | 2014-01-22 |
| CN103532376B CN103532376B (en) | 2016-11-30 |
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| CN103956895A (en) * | 2014-02-26 | 2014-07-30 | 友达光电股份有限公司 | Charge pump circuit |
| CN104852570A (en) * | 2015-05-11 | 2015-08-19 | 无锡中星微电子有限公司 | Power charge pump and power management circuit with power charge pump |
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