CN103501110B - A kind of charge pump circuit - Google Patents
A kind of charge pump circuit Download PDFInfo
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- CN103501110B CN103501110B CN201310442155.6A CN201310442155A CN103501110B CN 103501110 B CN103501110 B CN 103501110B CN 201310442155 A CN201310442155 A CN 201310442155A CN 103501110 B CN103501110 B CN 103501110B
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Abstract
The invention provides a kind of charge pump circuit, comprising: the first input power; First electric capacity; Second electric capacity; Output capacitance; It is characterized in that, also comprise: the second input power, eight control switchs, the clock signal of three kinds of described switches of control, by two input powers, after eight switch control rule, the output voltage v0=1/3 × v1+2/3 × v2 finally obtained.Due to can be formed specific scale factor and input power by electronic devices and components product after sue for peace, even so the capacitor element of limited quantity, also form multiple multiplying power and export.
Description
Technical field
The present invention relates to the technical field of voltage transitions, especially a kind of charge pump circuit.
Background technology
Charge pump (chargepump) common in prior art has two kinds: one is applied in phase-locked loop circuit, be connected to phase frequency detector rear class, by producing comparatively stable voltage to capacitor charge and discharge, for use in the frequency controlling voltage controlled oscillator; Another kind passes through switching capacity, for voltage transitions, the power output circuit of larger output current can be provided, because this charge pump can realize higher voltage conversion efficiency, so be widely used in voltage conversion circuit based on the charge circuit of switching capacity.In order to the two be distinguished, the latter is called power charge pump.General power charge pump adopts an input voltage, can produce the output voltage higher than input voltage, and also can produce the output voltage lower than input voltage, the efficiency of this power charge pump is higher than linear voltage regulator.
Power charge pump with compared with the DC-to-DC converter based on inductance, without the need to the inductance that volume is larger, so be more applicable for the less circuit in space, such as PCB circuit.In addition, for desirable switch, the energy loss of power charge pump can be left in the basket, and in this case, can think that the efficiency of charge pump circuit is 100%, and the cost of charge pump is lower, so be more and more subject to the favor of user.
But existing power charge pump circuit can only with some fixing multiplying power changing voltage, and such fixed multiplying power is limited several.Such as, for same input voltage source in prior art, only adopt one and fly in the circuit of electric capacity, the multiplying power that can produce VO/VIN (wherein VO is output voltage, and VIN is input voltage) has: 2 times, 1 times, 1/2 times; Adopting two flies in the circuit of electric capacity (flyingcapacitor), and the multiplying power of VO/VIN (wherein VO is output voltage, and VIN is input voltage) has: 3 times, 2 times, 3/2 times, 4/3 by, 1 times, 2/3 times, 1/2 times, 1/3 times; Increase the number flying electric capacity more, more how possible multiplying power can be produced, and more possible multiplying power, be conducive to the real work efficiency of optimizing power electric charge.Such as: input voltage is 3.3V, output voltage is desired value is 2.5V, for only one fly electric capacity situation, 1 can only be adopted by pattern, the output voltage produced is 3.3V, then reduce to 2.5V by linear voltage regulation technology (linear voltage regulation technology can only reduce voltage), efficiency so is ideally 2.5V/3.3V=75.8%; And fly in the circuit of electric capacity for employing two, still can only adopt 1 times of pattern, the output voltage of generation is still 3.3V, and this efficiency also only has 75.8%; And be 3.3V for input voltage, when output voltage desired value is 2.2V, adopt one and fly capacitive power charge pump, efficiency just only has 75.8%, and adopt two to fly capacitive power charge pump, can adopt 2/3 times of pattern, the voltage that can produce output is like this 2.2V, and efficiency so is ideally 2.2V/2.2V=100%.But increase while flying electric capacity quantity, cost is corresponding increase also.
Summary of the invention
In order to solve in prior art to obtain more multiplying power patterns, need more to fly electric capacity quantity, and the technical problem causing cost high.The invention provides and a kind ofly comprise the less charge pump circuit flying electric capacity quantity, and more multiplying power can be produced.The technical solution used in the present invention is:
A kind of charge pump circuit comprises: the first input power; First electric capacity; Second electric capacity; Output capacitance; It is characterized in that, also comprise:
Second input power, its one end and described first input power one end are connected on an isopotential point, and one end of described output capacitance is also connected on described isopotential point;
First switch, its one end is connected with the other end of described first input power, and the other end is connected with described first electric capacity one end;
Second switch, its one end is connected with the other end of described second input power;
3rd switch, its one end is connected with the other end of described first switch, and the other end is connected with the other end of described output capacitance;
4th switch, its one end is connected with the other end of described second switch and described second input power, and described second switch is connected with one end of described second electric capacity with the other end of the 4th switch;
5th switch, its one end is connected with the other end of described second electric capacity, and the other end is connected with the other end of described first electric capacity;
6th switch, its one end is connected with the other end of described second input power, and the other end is connected with the other end of described 5th switch;
7th switch, its one end is connected with the other end of described second electric capacity, and the other end is connected with the other end of described output capacitance;
8th switch, its one end is connected with the other end of described second electric capacity, and the other end is connected with one end of described first electric capacity.
Above-mentioned charge pump circuit, is characterized in that, also comprises:
First clock signal C K1, controls the on off state of described first switch, second switch, the 5th switch;
Second clock signal CK2, controls the on off state of described 3rd switch, the 6th switch;
3rd clock signal C K3, controls the on off state of described 4th switch, the 7th switch, the 8th switch.
Above-mentioned charge pump circuit, is characterized in that, described eight switches are in the state of pass respectively when the clock signal received is the first level, the state be in out when the clock signal received is second electrical level.
Above-mentioned charge pump circuit, is characterized in that, described first clock signal C K1, second clock signal CK2, is high when the 3rd clock signal C K3 is different.
Above-mentioned arbitrary charge pump circuit, is characterized in that, the voltage of described first input power is v1; The voltage of described second input power is v2; The voltage of described out-put supply is v0, and v0=1/3 × v1+2/3 × v2; Target voltage values is v ', wherein v0 >=v '.
Above-mentioned arbitrary charge pump circuit, is characterized in that, described first electric capacity, the second electric capacity, the 3rd electric capacity are respectively and fly electric capacity.
Above-mentioned charge pump circuit, is characterized in that, described in fly electric capacity be ceramic condenser.
Above-mentioned arbitrary charge pump circuit, is characterized in that, described eight switches are power switch.
Above-mentioned arbitrary charge pump circuit, is characterized in that, described first power supply is the power supply of battery; Described second source is non-battery power supply.
By adopting above-mentioned charge pump circuit, because output voltage v0=1/3 × v1+2/3 × v2; So limited quantity fly electric capacity time, can be adjusted by two input powers and obtain more output voltage, namely can obtain more input/output multiplying power.Further, in order to obtain one when the output voltage of v0 between v1, v2, adopting technical scheme of the present invention, v0-v1=2/3 × (v2-v1) 0 can be found out, and v0-v2=1/3 × (v1-v2); So the magnitude relationship of no matter v1 and v2, v0 is the value be between v1 and v2, like this relative to more easily obtaining the voltage close with desired value.
Accompanying drawing explanation
Figure 1 shows that the structure chart of charge pump circuit provided by the invention;
Figure 2 shows that the structure chart of charge pump circuit provided by the invention when CK1 is high;
Figure 3 shows that the schematic diagram after the structure chart simplification shown in Fig. 2;
Figure 4 shows that the structure chart of charge pump circuit provided by the invention when CK2 is high;
Figure 5 shows that the schematic diagram after the structure chart simplification shown in Fig. 4;
Figure 6 shows that the structure chart of charge pump circuit provided by the invention when CK3 is high;
Figure 7 shows that the schematic diagram after the structure chart simplification shown in Fig. 6.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, it should be noted that, these specific descriptions just allow those of ordinary skill in the art be more prone to, clearly understand the present invention, but not limitation of the invention is explained.
Be illustrated in figure 1 the structure chart of charge pump circuit provided by the invention.Charge pump circuit provided by the invention comprises: two power supplys, eight switches, three electric capacity, three kinds of clock signals.Particularly:
Charge pump circuit comprises: the first input power V1; First electric capacity C1; Second electric capacity C2; Output capacitance C0; Characterized by further comprising:
Second input power V2, its one end and described first input power V1 one end are connected on an isopotential point, and one end of described output capacitance C0 is also connected on described isopotential point;
First switch S 1, its one end is connected with the other end of described first input power V1, and the other end is connected with described first electric capacity C1 one end;
Second switch S2, its one end is connected with the other end of described second input power V2;
3rd switch S 3, its one end is connected with the other end of described first switch S 1, and the other end is connected with the other end of described output capacitance C0;
4th switch S 4, its one end is connected with the other end of described second switch S2 and described second input power V2, and described second switch is connected with one end of described second electric capacity with the other end of the 4th switch;
5th switch, its one end is connected with the other end of described second electric capacity, and the other end is connected with the other end of described first electric capacity;
6th switch, its one end is connected with the other end of described second input power, and the other end is connected with the other end of described 5th switch;
7th switch, its one end is connected with the other end of described second electric capacity, and the other end is connected with the other end of described output capacitance;
8th switch, its one end is connected with the other end of described second electric capacity, and the other end is connected with one end of described first electric capacity.
Present invention also offers the clock signal that three kinds control above-mentioned eight switches, be respectively:
First clock signal C K1, controls the on off state of described first switch, second switch, the 5th switch;
Second clock signal CK2, controls the on off state of described 3rd switch, the 6th switch;
3rd clock signal C K3, controls the on off state of described 4th switch, the 7th switch, the 8th switch.
In above-mentioned charge pump circuit, eight switches are in the state of pass respectively when the clock signal received is the first level (such as high), namely switch is in the state of conducting, the state be in out when the clock signal received is second electrical level (such as low), namely switch is in the state of disconnection.
Above-mentioned charge pump circuit, is characterized in that, described first clock signal C K1, second clock signal CK2 is the first level when the 3rd clock signal C K3 is different, and namely three kinds of clock signals are not in the same time, one can only be had to be the first level, and other two is second electrical level.There is not overlapping control between three clock signals, namely in order to avoid being that overlapping situation appears in the first level simultaneously, between 3 signals, there is certain Dead Time
In the technical solution used in the present invention, preferably, the first electric capacity, the second electric capacity are respectively and fly electric capacity (flying capacitance), and the 3rd electric capacity is output capacitance; And flying electric capacity is ceramic condenser; And eight switches are power switch.
And along with modern electronic system design becomes increasingly complex, such as, be all equipped with Power Management Unit (PowerManagementUnits) in the systems such as panel computer, smart mobile phone, bluetooth earphone, they can support that plurality of voltages exports usually, some is linear voltage regulator, and some is DC-to-DC converter.So in such systems, during design (power) charge pump circuit, the first power supply can be adopted to be the power supply of battery, second source is the non-battery power supply power supply of supply voltage (in addition to the battery can).
As Fig. 2 ~ Fig. 7 describes the specific works process of Fig. 1:
Figure 2 shows that the structure chart of charge pump circuit provided by the invention when CK1 is high, Figure 3 shows that the schematic diagram after the structure chart simplification shown in Fig. 2.As shown in Figure 2, when clock signal CK1 is high, switch S 1, S2, S5 are in conducting state, and other switches are in off-state; Schematic diagram after simplifying from Fig. 3, can find out: in this moment, the magnitude of voltage of the first input power V1 is v1, and the magnitude of voltage of the second input power is v2, and the magnitude of voltage of the first electric capacity C1 is vc1, and the magnitude of voltage of the second electric capacity C2 is vc2, and there is following relation:
v1＝v2+vc1+vc2(1)
Figure 4 shows that the structure chart of charge pump circuit provided by the invention when CK2 is high; Figure 5 shows that the schematic diagram after the structure chart simplification shown in Fig. 4.As shown in Figure 4, when clock signal CK2 is high, switch S 3, S6 are in conducting state, and other switches are in off-state; Schematic diagram after simplifying from Fig. 5, can find out: in this moment, the magnitude of voltage of out-put supply C0 is v0, and the magnitude of voltage of the second input power is v2, and the magnitude of voltage of the first electric capacity C1 is vc1, and there is following relation:
v0＝v2+vc1(2)
Figure 6 shows that the structure chart of charge pump circuit provided by the invention when CK3 is high; Figure 7 shows that the schematic diagram after the structure chart simplification shown in Fig. 6.As shown in Figure 6, when clock signal CK3 is high, switch S 4, S7, S8 are in conducting state, and other switches are in off-state; Schematic diagram after simplifying from Fig. 7, can find out: in this moment, the magnitude of voltage of out-put supply C0 is v0, and the magnitude of voltage of the second input power is v2, and the magnitude of voltage of the first electric capacity C1 is vc1, and the magnitude of voltage of the second electric capacity C2 is vc2, and there is following relation:
v0＝v2-vc1+vc2(3)
It should be explicitly made clear at this point, for under stable state, voltage vc1, vc2 on electric capacity C1, C2, when three different, should maintain approximately equal, and input power is as constant value, combinatorial formula (1), (2), (3), can solves and obtain:
v0＝1/3×v1+2/3×v2
Because output voltage v0=1/3 × v1+2/3 × v2; So limited quantity fly electric capacity time, can be adjusted by two input powers and obtain more output voltage, namely can obtain more input/output multiplying power.
According to the relational expression obtaining v0 and v1, v2 above; Can with scheme comparison of the prior art, such as described first input power is 3.3V; Described second input power is 2.4V; And desired value is 2.5V.No matter prior art is being the technical scheme that employing one flies electric capacity, or adopt two technical schemes flying electric capacity, all can only obtain the efficiency of 75.8%.And adopt technical scheme of the present invention, first can produce the voltage of 1/3 × 3.3V+2/3 × 2.4V=2.7V, then be converted to 2.5V through linear voltage regulator, last ideal efficiency is 2.5V/2.7V=92.6%.Compared with prior art visible, substantially increase the efficiency of power utilization.
It should be noted that, the scheme in the present invention, being mainly applicable to target voltage values is v ', wherein v0 >=v '; Main cause is if the magnitude of voltage v0 exported not exclusively equals desired value v ', also needs by output voltage through linear voltage regulation, just can obtain desired value.And in technical scheme of the present invention, be more suitable for and can find out v0-v1=2/3 × (v2-v1) to obtain one when the output voltage of v0 between v1, v2, and v0-v2=1/3 × (v1-v2); So the magnitude relationship of no matter v1 and v2, v0 is the value be between v1 and v2, like this relative to more easily obtaining the voltage close with desired value.
Finally it should be noted that, above-mentioned explanation is only most preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Any those of ordinary skill in the art; do not departing within the scope of technical solution of the present invention; the way of above-mentioned announcement and technology contents all can be utilized to make many possible variations and simple replacement etc. to technical solution of the present invention, and these all belong to the scope of technical solution of the present invention protection.
Claims (9)
1. a charge pump circuit comprises: the first input power; First electric capacity; Second electric capacity; Output capacitance; It is characterized in that, also comprise:
Second input power, its one end and described first input power one end are connected on an isopotential point, and one end of described output capacitance is also connected on described isopotential point;
First switch, its one end is connected with the other end of described first input power, and the other end is connected with described first electric capacity one end;
Second switch, its one end is connected with the other end of described second input power;
3rd switch, its one end is connected with the other end of described first switch, and the other end is connected with the other end of described output capacitance;
4th switch, its one end is connected with the other end of described second switch and described second input power, and described second switch is connected with one end of described second electric capacity with the other end of the 4th switch;
5th switch, its one end is connected with the other end of described second electric capacity, and the other end is connected with the other end of described first electric capacity;
6th switch, its one end is connected with the other end of described second input power, and the other end is connected with the other end of described 5th switch;
7th switch, its one end is connected with the other end of described second electric capacity, and the other end is connected with the other end of described output capacitance;
8th switch, its one end is connected with the other end of described second electric capacity, and the other end is connected with one end of described first electric capacity.
2. charge pump circuit as claimed in claim 1, is characterized in that, also comprise:
First clock signal C K1, controls the on off state of described first switch, second switch, the 5th switch;
Second clock signal CK2, controls the on off state of described 3rd switch, the 6th switch;
3rd clock signal C K3, controls the on off state of described 4th switch, the 7th switch, the 8th switch.
3. charge pump circuit as claimed in claim 2, it is characterized in that, the first switch is in the state of pass respectively to the 8th switch when the clock signal received is the first level, the state be out when the clock signal received is in second electrical level.
4. charge pump circuit as claimed in claim 3, is characterized in that, described first clock signal C K1, second clock signal CK2, is the first level when the 3rd clock signal C K3 is different.
5. the charge pump circuit as described in as arbitrary in Claims 1 to 4, is characterized in that,
The voltage of described first input power is v1;
The voltage of described second input power is v2;
The voltage of described out-put supply is v0, and v0=1/3 × v1+2/3 × v2;
Target voltage values is v ', wherein v0 >=v '.
6. the charge pump circuit as described in as arbitrary in Claims 1 to 4, is characterized in that, described first electric capacity, the second electric capacity for flying electric capacity, the 3rd electric capacity is output capacitance.
7. charge pump circuit as claimed in claim 6, is characterized in that, described in fly electric capacity be ceramic condenser.
8. the charge pump circuit as described in as arbitrary in Claims 1 to 4, it is characterized in that, described eight switches are power switch.
9. the charge pump circuit as described in as arbitrary in Claims 1 to 4, is characterized in that,
Described first input power is the power supply of battery;
Described second input power is non-battery power supply.
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| CN201310442155.6A CN103501110B (en) | 2013-09-25 | 2013-09-25 | A kind of charge pump circuit |
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| CN103501110B true CN103501110B (en) | 2015-12-09 |
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| CN107040133B (en) * | 2017-03-13 | 2019-04-16 | 南京中感微电子有限公司 | Charge pump |
| CN107223303B (en) * | 2017-05-05 | 2018-12-14 | 深圳市汇顶科技股份有限公司 | Voltage conversion device and fingerprint detection system |
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| CN1964169A (en) * | 2005-11-07 | 2007-05-16 | 三星Sdi株式会社 | Dc-dc conveter and organiclight emitting display using the same |
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| EP2309629A1 (en) * | 2009-10-09 | 2011-04-13 | Dialog Semiconductor GmbH | VDD/5 or VDD/6 fractional charge-pump |
| CN102356536A (en) * | 2009-03-20 | 2012-02-15 | 高通股份有限公司 | Passive differential voltage doubler |
| CN203491890U (en) * | 2013-09-25 | 2014-03-19 | 无锡中星微电子有限公司 | Charge pump circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5758866B2 (en) * | 2011-12-16 | 2015-08-05 | 旭化成エレクトロニクス株式会社 | Charge pump circuit and load drive system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1964169A (en) * | 2005-11-07 | 2007-05-16 | 三星Sdi株式会社 | Dc-dc conveter and organiclight emitting display using the same |
| CN1992490A (en) * | 2005-12-26 | 2007-07-04 | 松下电器产业株式会社 | Step-up device and step-down device |
| CN102356536A (en) * | 2009-03-20 | 2012-02-15 | 高通股份有限公司 | Passive differential voltage doubler |
| EP2309629A1 (en) * | 2009-10-09 | 2011-04-13 | Dialog Semiconductor GmbH | VDD/5 or VDD/6 fractional charge-pump |
| CN203491890U (en) * | 2013-09-25 | 2014-03-19 | 无锡中星微电子有限公司 | Charge pump circuit |
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Address after: 214028 Jiangsu Province, Wuxi City District Qingyuan Road No. 18 Taihu International Science Park sensor network university science and Technology Park 530 building A1001 Patentee after: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. Address before: A 530 Taihu international science and Technology Park building 214135 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee before: Wuxi Vimicro Co., Ltd. |