CN103532377A - Charge pump device and power management circuit using same - Google Patents
Charge pump device and power management circuit using same Download PDFInfo
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- CN103532377A CN103532377A CN201310536182.XA CN201310536182A CN103532377A CN 103532377 A CN103532377 A CN 103532377A CN 201310536182 A CN201310536182 A CN 201310536182A CN 103532377 A CN103532377 A CN 103532377A
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Abstract
The invention provides a charge pump device and a power management circuit using the same. The charge pump device comprises a first voltage source, a second voltage source, a voltage conversion module, an output module and a drive module, wherein the voltage conversion module comprises a first capacitor, a second capacitor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch and an eighth switch; the output module comprises an output capacitor; the output capacitor is connected between a voltage output end and a ground node; the drive module is used for outputting a drive signal to control the switches to be on or off. Compared with the prior art, the charge pump device is provided with a voltage input end and can be used for generating more other rates by more other voltages except for a battery unit voltage in the power management circuit, so that more possible rate conversion voltages can be generated by fewer flying capacitors and the actual work efficiency of a power charge pump is optimized.
Description
[technical field]
The present invention relates to the technical field of voltage transitions, particularly a kind of charge pump apparatus and use the electric power management circuit of this device.
[background technology]
At present, there are two kinds of classical circuit to be all called as charge pump (Charge Pump).A kind of is to be applied in phase-locked loop circuit, is connected in phase frequency detector rear class, by capacitor charge and discharge is produced to comparatively stable voltage, for use in the frequency of controlling voltage controlled oscillator; Another kind is by switching capacity, for voltage transitions, can provide the power output circuit of larger output current, and it can be described as power charge pump.An input voltage of the general employing of power charge pump of the prior art, can produce the output voltage higher than input, also can produce the output voltage lower than input, and its efficiency is higher than linear voltage regulator in addition.
Charge pump circuit based on switching capacity is widely used in voltage conversion circuit, can realize higher voltage transitions efficiency.For desirable switch, its energy loss can be left in the basket, in this case, can think that the efficiency of power charge pump circuit is 100%, but power charge pump circuit is only when with some fixing multiplying power changing voltage, its ideal power is just 100%, yet that fixing multiplying power only has is limited several.In prior art, for the power charge pump circuit that only adopts two to fly electric capacity (flying capacitor), mainly for same input voltage source, the VO/VIN(that existing Literature Discussion is crossed 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 the power charge pump circuit that only adopts to fly electric capacity, the VO/VIN multiplying power existing in prior art has: 2 times, 1 times, 1/2 times.By increase, fly the number of electric capacity, can produce how possible multiplying power, and increase how possible multiplying power, be conducive to the real work efficiency of optimizing power charge pump.For example, input voltage VIN is 3.3V, the desired value of output voltage VO is 3.4V, for a situation that flies electric capacity only, can only adopt 2 times of patterns, produce 6.6V voltage, then by linear voltage regulation technology (linear voltage regulation technology can only reduce voltage), reduce to 3.4V, its efficiency is ideally 3.4V/6.6V=51.5%; For adopting two, fly electric capacity situation, can adopt 4/3 times of pattern, produce 4.4V voltage, then by linear voltage regulation technology, reduce to 3.4V, its efficiency is ideally 3.4V/4.4V=77.3%, has so just improved operating efficiency.For example, when input voltage VIN changes within the specific limits (during powered battery, along with battery discharge or charging, its input voltage can constantly change), more multiplying power patterns contribute to optimize the operating efficiency under different input voltages.
Although, by increase, fly the number of electric capacity, can produce how possible multiplying power, be conducive to the real work efficiency of optimizing power charge pump, cost increases thereupon, therefore, is necessary to provide a kind of improved technical scheme to overcome the problems referred to above.
[summary of the invention]
The object of the present invention is to provide a kind of charge pump apparatus and use the electric power management circuit of this device, it can be realized and use the less electric capacity that flies to produce how possible multiplying power changing voltage, thus the real work efficiency of optimizing power charge pump.
In order to address the above problem, according to an aspect of the present invention, the invention provides a kind of charge pump apparatus, it comprises the first voltage source, second voltage source, voltage transformation module, output module and driver module.Described voltage transformation module comprises the first electric capacity, the second electric capacity, the first switch, second switch, the 3rd switch, the 4th switch, the 5th switch, the 6th switch, minion pass and the 8th switch; Described output module comprises output capacitance, and described output capacitance is connected between voltage output end and ground node; Wherein, the minus earth in the negative pole of the first voltage source and second voltage source; The first switch, the first electric capacity, the 5th switch, the second electric capacity, second switch are series between the positive pole of the first voltage source and the positive pole in second voltage source successively; The 4th switch is connected between the positive pole of the first voltage source and connected node and the connected node between the second electric capacity and second switch between the first switch; The 8th switch is connected between the connected node and the connected node between the 5th switch and the second electric capacity between the first switch and the first electric capacity; The 6th switch is connected between the positive pole of the first voltage source and connected node and the connected node between the first electric capacity and the 5th switch between the first switch; Minion is closed and is connected between the connected node and voltage output end between the first electric capacity and the 5th switch; The 3rd switch is connected between the connected node and voltage output end between the first switch and the first electric capacity.Described driver module output drive signal, to control conducting or the shutoff of each switch, wherein, when controlling the first switch, second switch, the 5th switch conduction, is controlled the 3rd switch, the 4th switch, the 6th switch, minion pass and the 8th switch and is turn-offed; When controlling the 3rd switch and the 6th switch conduction, control switch the first switch, second switch, the 4th switch, the 5th switch, minion are closed and the 8th switch turn-offs; When controlling the 4th switch, minion pass and the 8th switch conduction, control the first switch, second switch, the 3rd switch, the 5th switch and the 6th switch and turn-off.
Further, the driving signal of described driver module output comprises the first driving signal, two driving signal and the 3rd drives signal, wherein first drive signal to be connected with the first switch, second switch and the control end of the 5th switch, to control conducting or the shutoff of the first switch, second switch and the 5th switch; Two driving signal is connected with the control end of the 6th switch with the 3rd switch, to control conducting or the shutoff of the 3rd switch and the 6th switch; The 3rd drives signal to close and be connected with the control end of the 8th switch with the 4th switch, minion, to control conducting or the shutoff of the 4th switch, minion pass and the 8th switch.
Further, described eight switches are all MOS transistor, and it is all clock signal that the first driving signal, two driving signal and the 3rd drive signal.
Further, first drives signal, two driving signal and the 3rd to drive between signal and have certain Dead Time, to avoid the conducting simultaneously of described eight switches.
Further, while driving signal to be high level, make corresponding switch conduction, while driving signal to be low level, corresponding switch is turn-offed, when the first driving signal is high level, it is low level that two driving signal and the 3rd drives signal, meets following relation: V1=V2+VC1+VC2 (1) wherein, V1 is the magnitude of voltage of the first voltage source, V2 is the magnitude of voltage in second voltage source, and VC1 is the magnitude of voltage at the first electric capacity two ends, and VC2 is the magnitude of voltage at the second electric capacity two ends; When two driving signal is high level, first drives signal and the 3rd to drive signal is low level, meets following relation: VO=V1+VC1 (2), wherein, VO is the magnitude of voltage of described voltage output end, and VC1 is the magnitude of voltage at the first electric capacity two ends, and V1 is the magnitude of voltage of the first voltage source; When the 3rd drives signal to be high level, the first driving signal and two driving signal are low level, meet following relation: VO=V1-VC1+VC2 (3), wherein, VO is the magnitude of voltage of described voltage output end, VC1 is the magnitude of voltage at the first electric capacity two ends, and VC2 is the magnitude of voltage at the second electric capacity two ends, and combinatorial formula (1), (2), (3) solve: VO=(4/3) .V1-(1/3) .V2.
Further, described the first electric capacity and the second electric capacity are for flying electric capacity.
According to another aspect of the present invention, the invention provides a kind of electric power management circuit, it comprises: battery unit; Charge pump apparatus; Voltage regulator circuit, the voltage providing based on battery unit obtains predetermined voltage.Charge pump apparatus, it comprises the first voltage source, second voltage source, voltage transformation module, output module and driver module.Described voltage transformation module comprises the first electric capacity, the second electric capacity, the first switch, second switch, the 3rd switch, the 4th switch, the 5th switch, the 6th switch, minion pass and the 8th switch; Described output module comprises output capacitance, and described output capacitance is connected between voltage output end and ground node; Wherein, the minus earth in the negative pole of the first voltage source and second voltage source; The first switch, the first electric capacity, the 5th switch, the second electric capacity, second switch are series between the positive pole of the first voltage source and the positive pole in second voltage source successively; The 4th switch is connected between the positive pole of the first voltage source and connected node and the connected node between the second electric capacity and second switch between the first switch; The 8th switch is connected between the connected node and the connected node between the 5th switch and the second electric capacity between the first switch and the first electric capacity; The 6th switch is connected between the positive pole of the first voltage source and connected node and the connected node between the first electric capacity and the 5th switch between the first switch; Minion is closed and is connected between the connected node and voltage output end between the first electric capacity and the 5th switch; The 3rd switch is connected between the connected node and voltage output end between the first switch and the first electric capacity.Described driver module output drive signal, to control conducting or the shutoff of each switch, wherein, when controlling the first switch, second switch, the 5th switch conduction, is controlled the 3rd switch, the 4th switch, the 6th switch, minion pass and the 8th switch and is turn-offed; When controlling the 3rd switch and the 6th switch conduction, control switch the first switch, second switch, the 4th switch, the 5th switch, minion are closed and the 8th switch turn-offs; When controlling the 4th switch, minion pass and the 8th switch conduction, control the first switch, second switch, the 3rd switch, the 5th switch and the 6th switch and turn-off.Described battery unit is as the first voltage source in charge pump apparatus, and described voltage regulator circuit is as the second voltage source in charge pump apparatus; Or described battery unit is as the second voltage source in charge pump apparatus, and described voltage regulator circuit is as the first voltage source in charge pump apparatus.
Compared with prior art, charge pump apparatus increase in the present invention has a voltage input end, it can utilize more other voltages that exist except battery cell voltage in electric power management circuit, produce more other multiplying powers, to realize, use the less electric capacity that flies to produce how possible multiplying power changing voltage, thus the real work efficiency of optimizing power charge pump.
[accompanying drawing explanation]
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, 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.Wherein:
Fig. 1 is the circuit diagram of the present invention's charge pump apparatus in one embodiment;
Fig. 2 a be charge pump apparatus in Fig. 1 in one embodiment, when the first driving signal CK1 is high level, equivalent working circuit diagram when two driving signal CK2 and the 3rd drives signal CK3 to be low level;
Fig. 2 b be charge pump apparatus in Fig. 1 in one embodiment, when two driving signal CK2 is high level, the first equivalent working circuit diagram while driving signal CK1 and the 3rd to drive signal CK3 to be low level;
Fig. 2 c be charge pump apparatus in Fig. 1 in one embodiment, when the 3rd drives signal CK3 to be high level, the first equivalent working circuit diagram while driving signal CK1 and two driving signal CK2 to be low level.
[embodiment]
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Alleged " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur not all refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally.Unless stated otherwise, the word that connection herein, the expression that is connected, joins are electrically connected all represents to be directly or indirectly electrical connected.
Please refer to shown in Fig. 1, it is the circuit diagram of the present invention's charge pump apparatus in one embodiment.Described charge pump apparatus comprises the first voltage source (or claiming the first voltage) V1, second voltage source (or claiming second voltage) V2, voltage transformation module 110, output module 120 and driver module 130.
Described voltage transformation module 110 comprises the first capacitor C 1, the second capacitor C 2, the first switch S 1, second switch S2, the 3rd switch S 3, the 4th switch S 4, the 5th switch S 5, the 6th switch S 6, minion pass S7 and the 8th switch S8.Wherein, the minus earth of the negative pole of the first voltage source V 1 and second voltage source V2; The first switch S 1, the first capacitor C 1, the 5th switch S 5, the second capacitor C 2, second switch S2 are series between the positive pole of the first voltage source V 1 and the positive pole of second voltage source V2 successively; The 4th switch S 4 is connected between the positive pole of the first voltage source V 1 and connected node and the connected node between the second capacitor C 2 and second switch S2 between the first switch S 1; The 8th switch S8 is connected between the connected node and the connected node between the 5th switch S 5 and the second capacitor C 2 between the first switch S 1 and the first capacitor C 1; The 6th switch S 6 is connected between the positive pole of the first voltage source V 1 and connected node and the connected node between the first capacitor C 1 and the 5th switch S 5 between the first switch S 1; Minion is closed S7 and is connected between the connected node and voltage output end VO between the first capacitor C 1 and the 5th switch S 5; The 3rd switch S 3 is connected between the connected node and voltage output end VO between the first switch S 1 and the first capacitor C 1.
Described output module 120 comprises output capacitance CO, and described output capacitance CO is connected between voltage output end VO and ground node.
Described driver module 130 output drive signals are with control switch S1-S8 conducting or shutoff, and wherein, when control switch S1, S2 and S5 conducting, control switch S3, S4, S6, S7 and S8 turn-off; When control switch S3 and S6 conducting, control switch S1, S2, S4, S5, S7 and S8 turn-off; When control switch S4, S7 and S8 conducting, control switch S1, S2, S3, S5 and S6 turn-off.Be specially, the driving signal of described driver module 130 outputs comprises the first driving signal CK1, two driving signal CK2 and the 3rd drives signal CK3, wherein first drives signal CK1 to be connected with the control end of switch S 1, S2 and S5, with conducting or the shutoff of control switch S1, S2 and S5; Two driving signal CK2 is connected with the control end of switch S 3 and S6, with conducting or the shutoff of control switch S3 and S6; The 3rd drives signal CK3 to be connected with the control end of switch S 4, S7 and S8, with conducting or the shutoff of control switch S4, S7 and S8.In a specific embodiment, switch S 1-S8 is MOS (Metal-Oxide-Semiconductor) transistor, drive signal CK1, CK2 and CK3 are clock signal, described the first level is the level signal that makes each switch conduction, such as, switch S 1-S8 is NMOS(N-Channel Metal Oxide Semiconductor) transistor, while driving signal to be high level, make corresponding switch conduction, while driving signal to be low level, corresponding switch is turn-offed, and make to drive signal CK1, the high level of CK2 and CK3 (i.e. the first level) time not overlapping (also can say between three driving signals and have certain Dead Time), can avoid like this switch S 1-S8 conducting simultaneously.
Below with reference to Fig. 2 a-2c, introduce charge pump apparatus in Fig. 1 specific works process in one embodiment.
When the first driving signal CK1 is high level, it is low level that two driving signal CK2 and the 3rd drives signal CK3, driver module 130 control switch S1, S2 and S5 conducting, control switch S3, S4, S6, S7 and S8 turn-off, now, as shown in Figure 2 a, it meets following relation to the equivalent working circuit diagram of the charge pump apparatus in Fig. 1:
V1=V2+VC1+VC2 (1)
Wherein, V1 is the magnitude of voltage of the first voltage source V 1, and V2 is the magnitude of voltage of second voltage source V2, and VC1 is the magnitude of voltage at the first capacitor C 1 two ends, and VC2 is the magnitude of voltage at the second capacitor C 2 two ends.
When two driving signal CK2 is high level, it is low level that the first driving signal CK1 and the 3rd drives signal CK3, driver module 130 control switch S3 and S6 conducting, control switch S1, S2, S4, S5, S7 and S7 turn-off, now, as shown in Figure 2 b, it meets following relation to the equivalent working circuit diagram of the charge pump apparatus in Fig. 1:
VO=V1+VC1 (2)
Wherein, VO is the magnitude of voltage (it equals the magnitude of voltage at output capacitance CO two ends) of voltage output end VO, and VC1 is the magnitude of voltage at the first capacitor C 1 two ends, and V1 is the magnitude of voltage of the first voltage source V 1.
When the 3rd drives signal CK3 to be high level, the first driving signal CK1 and two driving signal CK2 are low level, when driver module 130 control switch S4, S7 and S8 conducting, control switch S1, S2, S3, S5 and S6 turn-off, now, as shown in Figure 2 c, it meets following relation to the equivalent working circuit diagram of the charge pump apparatus in Fig. 1:
VO=V1-VC1+VC2 (3)
Wherein, VO is the magnitude of voltage of voltage output end VO, and VC1 is the magnitude of voltage at the first capacitor C 1 two ends, and VC2 is the magnitude of voltage at the second capacitor C 2 two ends.
Under stable state, the voltage on capacitor C 1, C2 should maintain approximately equal.Like this, combinatorial formula (1), (2), (3) solve:
VO=(4/3).V1-(1/3).V2
In summary, charge pump apparatus in the present invention is based on an output voltage VO of two supply voltage conversion output, and VO=(4/3) .V1-(1/3) .V2, wherein, V1 is the magnitude of voltage of the first voltage source V 1, V2 is the magnitude of voltage of second voltage source V2, and therefore, the charge pump apparatus in the present invention can be described as again fractional ratio difference charge pump.
Along with modern electronic system design becomes increasingly complex, in electronic system, except battery cell voltage, also need more other voltage, for example, panel computer, smart mobile phone, electric power management circuit (or being called Power Management Unit (Power Management Units)) in the systems such as bluetooth earphone, is all equipped with, it can support plurality of voltages output conventionally, be specially, electric power management circuit comprises battery unit and voltage regulator circuit, the voltage that described voltage regulator circuit provides based on battery unit obtains a plurality of other predetermined voltage (or claiming non-battery cell voltage).If the charge pump apparatus in the invention described above is applied in electric power management circuit, can be by utilizing in battery cell voltage and electric power management circuit other voltage (being the voltage of voltage regulator circuit output) existing except battery cell voltage to build the voltage mode of more other multiplying powers, thus contribute to the efficiency of optimizing power charge pump.
By an embodiment, specifically introduce the application of the charge pump apparatus shown in Fig. 1 in electric power management circuit in the present invention below.
The battery unit of usining in electric power management circuit is as the first voltage source V 1 of the charge pump apparatus in Fig. 1, the voltage regulator circuit of usining in electric power management circuit is as the second voltage source V2 of the charge pump apparatus in Fig. 1, in the certain situation of battery cell voltage (it is called the input voltage VIN of charge pump apparatus), adopt different non-battery cell voltage (being described voltage regulator circuit other voltages based on battery cell voltage output) as second source voltage V2, can obtain different output voltage VO, to produce more other multiplying powers (multiplying power equals VO/VIN), thereby realize, use the less electric capacity that flies to produce how possible multiplying power, and then be conducive to improve the actual power efficiency of power charge pump.In a specific embodiment, the electric capacity number that flies of supposing charge pump apparatus is two, input voltage (or claiming battery cell voltage) VIN is 3.3v, target output voltage is 3.4v, if use charge pump of the prior art, it is best that this charge pump adopts the pattern power supplying efficiency of 4/3 times of speed, adopts the pattern of 4/3 times of speed can produce the output voltage VO of 4.4V, by linear voltage regulation technology, reduce to 3.4v, power supplying efficiency is ideally 3.4v/4.4v=77.3%; If the charge pump apparatus in use the present invention, using input voltage VIN (3.3V) as the first input voltage V1, other voltage of the 2.4V that the described voltage regulator circuit of usining is exported is as the second input voltage V2, by the above-mentioned course of work, can produce the output voltage VO of (4/3) .V1-(1/3) .V2=3.6v, then by linear voltage regulator, be converted to 3.4V, power supplying efficiency is ideally 3.4v/3.6v=94.4%.As can be seen here, the present invention can realize and use the less electric capacity that flies to produce how possible multiplying power, and then is conducive to improve the actual power efficiency of power charge pump.
Easily full of beard and be, also the battery unit that can using in electric power management circuit is as the second voltage source V2 of the charge pump apparatus in Fig. 1, the voltage regulator circuit of usining in electric power management circuit is as the first voltage source V 1 of the charge pump apparatus in Fig. 1, thereby in the situation that the input voltage VIN of charge pump apparatus is certain, adopt different non-battery cell voltages, can produce more other multiplying powers.
In sum, charge pump apparatus in the present invention comprises the first voltage source (or claiming the first voltage) V1, second voltage source (or claiming second voltage) V2, voltage transformation module 110, output module 120 and driver module 130, this charge pump apparatus is based on an output voltage VO of two supply voltage conversion output, and VO=(4/3) .V1-(1/3) .V2, it can utilize more other voltages that exist except battery cell voltage in electric power management circuit, produce more other multiplying powers, to realize, use the less electric capacity that flies to produce how possible multiplying power changing voltage, thereby the real work efficiency of optimizing power charge pump.
In the present invention, " connection ", be connected, word that the expression such as " company ", " connecing " is electrical connected, if no special instructions, represent direct or indirect electric connection.
It is pointed out that being familiar with any change that person skilled in art does the specific embodiment of the present invention does not all depart from the scope of claims of the present invention.Correspondingly, the scope of claim of the present invention is also not limited only to previous embodiment.
Claims (7)
1. a charge pump apparatus, is characterized in that, it comprises the first voltage source, second voltage source, voltage transformation module, output module and driver module,
Described voltage transformation module comprises the first electric capacity, the second electric capacity, the first switch, second switch, the 3rd switch, the 4th switch, the 5th switch, the 6th switch, minion pass and the 8th switch;
Described output module comprises output capacitance, and described output capacitance is connected between voltage output end and ground node;
Wherein, the minus earth in the negative pole of the first voltage source and second voltage source; The first switch, the first electric capacity, the 5th switch, the second electric capacity, second switch are series between the positive pole of the first voltage source and the positive pole in second voltage source successively; The 4th switch is connected between the positive pole of the first voltage source and connected node and the connected node between the second electric capacity and second switch between the first switch; The 8th switch is connected between the connected node and the connected node between the 5th switch and the second electric capacity between the first switch and the first electric capacity; The 6th switch is connected between the positive pole of the first voltage source and connected node and the connected node between the first electric capacity and the 5th switch between the first switch; Minion is closed and is connected between the connected node and voltage output end between the first electric capacity and the 5th switch; The 3rd switch is connected between the connected node and voltage output end between the first switch and the first electric capacity,
Described driver module output drive signal, to control conducting or the shutoff of each switch, wherein, when controlling the first switch, second switch, the 5th switch conduction, is controlled the 3rd switch, the 4th switch, the 6th switch, minion pass and the 8th switch and is turn-offed; When controlling the 3rd switch and the 6th switch conduction, control switch the first switch, second switch, the 4th switch, the 5th switch, minion are closed and the 8th switch turn-offs; When controlling the 4th switch, minion pass and the 8th switch conduction, control the first switch, second switch, the 3rd switch, the 5th switch and the 6th switch and turn-off.
2. charge pump apparatus according to claim 1, it is characterized in that, the driving signal of described driver module output comprises the first driving signal, two driving signal and the 3rd drives signal, wherein first drive signal to be connected with the first switch, second switch and the control end of the 5th switch, to control conducting or the shutoff of the first switch, second switch and the 5th switch; Two driving signal is connected with the control end of the 6th switch with the 3rd switch, to control conducting or the shutoff of the 3rd switch and the 6th switch; The 3rd drives signal to close and be connected with the control end of the 8th switch with the 4th switch, minion, to control conducting or the shutoff of the 4th switch, minion pass and the 8th switch.
3. charge pump apparatus according to claim 2, is characterized in that,
Described eight switches are all MOS transistor, and it is all clock signal that the first driving signal, two driving signal and the 3rd drive signal.
4. charge pump apparatus according to claim 3, is characterized in that, first drives signal, two driving signal and the 3rd to drive between signal and have certain Dead Time, to avoid the conducting simultaneously of described eight switches.
5. charge pump apparatus according to claim 4, is characterized in that,
While driving signal to be high level, make corresponding switch conduction, while driving signal to be low level, corresponding switch turn-offed,
When the first driving signal is high level, it is low level that two driving signal and the 3rd drives signal, meets following relation:
V1=V2+VC1+VC2 (1)
Wherein, V1 is the magnitude of voltage of the first voltage source, and V2 is the magnitude of voltage in second voltage source, and VC1 is the magnitude of voltage at the first electric capacity two ends, and VC2 is the magnitude of voltage at the second electric capacity two ends;
When two driving signal is high level, first drives signal and the 3rd to drive signal is low level, meets following relation:
VO=V1+VC1 (2)
Wherein, the magnitude of voltage that VO is described voltage output end, VC1 is the magnitude of voltage at the first electric capacity two ends, V1 is the magnitude of voltage of the first voltage source;
When the 3rd drives signal to be high level, the first driving signal and two driving signal are low level, meet following relation:
VO=V1-VC1+VC2 (3)
Wherein, the magnitude of voltage that VO is described voltage output end, VC1 is the magnitude of voltage at the first electric capacity two ends, VC2 is the magnitude of voltage at the second electric capacity two ends,
Combinatorial formula (1), (2), (3) solve:
VO=(4/3).V1-(1/3).V2。
6. charge pump apparatus according to claim 2, is characterized in that, described the first electric capacity and the second electric capacity are for flying electric capacity.
7. an electric power management circuit, is characterized in that, it comprises:
Battery unit;
Voltage regulator circuit, the voltage providing based on battery unit obtains predetermined voltage;
Charge pump apparatus as described in as arbitrary in right 1-6,
Described battery unit is as the first voltage source in charge pump apparatus, and described voltage regulator circuit is as the second voltage source in charge pump apparatus; Or described battery unit is as the second voltage source in charge pump apparatus, and described voltage regulator circuit is as the first voltage source in charge pump apparatus.
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| CN111181387A (en) * | 2020-01-26 | 2020-05-19 | 上海韦孜美电子科技有限公司 | DC-DC converter |
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| US6806761B1 (en) * | 2003-05-01 | 2004-10-19 | National Semiconductor Corporation | Integrated charge pump circuit with low power voltage regulation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111181387A (en) * | 2020-01-26 | 2020-05-19 | 上海韦孜美电子科技有限公司 | DC-DC converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103532377B (en) | 2015-12-23 |
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