CN201904721U - Voltage-boosting charge pump - Google Patents
Voltage-boosting charge pump Download PDFInfo
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- CN201904721U CN201904721U CN2010206878587U CN201020687858U CN201904721U CN 201904721 U CN201904721 U CN 201904721U CN 2010206878587 U CN2010206878587 U CN 2010206878587U CN 201020687858 U CN201020687858 U CN 201020687858U CN 201904721 U CN201904721 U CN 201904721U
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- electric capacity
- pump stage
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Abstract
The utility model discloses a voltage-boosting charge pump which comprises a voltage-boosting loop formed by fly capacitors and switches, wherein, the voltage-boosting loop is provided with a power source terminal, an output terminal and a grounding device. The voltage-boosting charge pump is characterized in that the voltage-boosting loop only comprises three fly capacitors. The three fly capacitors, which are controlled through the switches, are circularly charged and discharged in one period by four steps, so as to enable the output terminal to acquire 1.2 times input voltage. The voltage-boosting loop of the 1.2 times voltage-boosting charge pump has a simple circuit, and only needs three fly capacitors; and the voltage-boosting charge pump has a high efficiency when being applied to LED backlight driving.
Description
Technical field
The utility model relates to a kind of power circuit, specifically is a kind of boosted charge pump circuit that boosts.
Background technology
As a kind of power supply change-over device, charge pump has extensive use, and wherein capacitive charge pump adopts capacitor to come storing energy, works in higher frequency, often uses small-sized ceramic condenser as energy-storage travelling wave tube; Such charge pump makes space hold little, and use cost is low, and owing to do not use inductance, so its radiation EMI can be ignored.The various advantages of capacitive charge pump makes it be very suitable for the portable use product, especially the electronic equipment that needs lithium battery power supply with White-light LED illumination, this kind equipment is because the characteristics of white light LEDs operating voltage, when directly powering, lithium battery can can't discharge again because cell voltage is lower than the LED operating voltage, this just need be provided with corresponding booster circuit in the limited device space, the voltage of lithium battery is promoted, it can fully be discharged under the condition of the operating voltage that is fit to white light LEDs, and the capacitive charge pump that boosts is exactly a kind of device that conforms with this requirement.
Capacitance type voltage-boosting charge pump commonly used at present, according to its voltage amplification factor, common has 2 times, 1.5 times, 1.33 times, the corresponding fixed qty of its circuit structure fly the electric capacity number, it is minimum, and to fly electric capacity quantity correspondence be exactly 1,2 and 3,, then need to reach 5 and fly electric capacity if will reach 1.2 times boosts.Capacitor take volume in portable product, often very easily be restricted, improve unilaterally and fly the electric capacity number, though can show that output voltage reaches requirement, the volume that it is huge causes having no practicality.
The utility model content
Fly the too much problem of electric capacity quantity at 1.2 times of boosting charge pumps of prior art, the utility model proposes a kind of boosted charge pump circuit, its technical scheme is as follows:
A kind of boosting charge pump comprises that this loop of boosting has power end by flying the loop of boosting that electric capacity and switch are formed, and output and ground connection is characterized in that:
The described loop of boosting comprises that first, second flies electric capacity with the 3rd;
Described first, second flies electric capacity all constitutes same structures separately with two switches first, second and the 3rd pump stage loop with the 3rd, and each pump stage loop all has first, second and the 3rd end, wherein:
The first pump stage loop: form with the 5th switch in parallel by whole after first switch and first capacitances in series; The tie point of first switch and the 5th switch becomes first end; The tie point of first switch and first electric capacity becomes second end; The tie point of first electric capacity and the 5th switch becomes the 3rd end;
The second pump stage loop: be formed in parallel by whole closing after the second switch and second capacitances in series with minion; The tie point that second switch and minion are closed becomes first end: the tie point of the second switch and second electric capacity becomes second end; The tie point that second electric capacity and minion are closed becomes the 3rd end;
The 3rd pump stage loop: constitute with the tenth switch in parallel by whole after the 3rd switch and the 3rd capacitances in series; The tie point of the 3rd switch and the tenth switch becomes first end; The tie point of the 3rd switch and the 3rd electric capacity becomes second end; The tie point of the 3rd electric capacity and the tenth switch becomes the 3rd end:
More than first, second and the 3rd pump stage loop in turn with first end and the 3rd end series aiding connection; The first termination input in the first pump stage loop; The 3rd end in the 3rd pump stage loop is by the 4th switch ground connection;
In addition, second end in the first pump stage loop connects an end of the 9th switch and the 6th switch simultaneously; The other end of the 9th switch is connected with the end that octavo is closed with second end in the second pump stage loop; After being connected, the other end that the other end of the 6th switch and octavo are closed connects described output; Second end in the 3rd pump stage loop connects output by the 11 switch, a filter capacitor in parallel between described output and the ground.。
Preferred person as the technical program, can do following improvement:
The described switch of one preferred embodiment is the electronic switch that comprises metal-oxide-semiconductor.
The described electronic switch prime of one preferred embodiment has by a cycle that has delay feature circuit takes place.
Described the 6th switch of one preferred embodiment is that four source electrodes and drain electrode identical metal-oxide-semiconductor in parallel constitutes, and these four metal-oxide-semiconductor grids and the described cycle take place between the circuit start-up circuit is arranged all.
The described cycle generator of one preferred embodiment and described boosting also have one drive circuit between the loop.
Described loop other parts except that flying electric capacity of boosting of one preferred embodiment are all on same chip.
Compared to existing technology, the beneficial effect that brings of the utility model is:
1. booster circuit is simple, flies electric capacity with 3 and has just realized that 1.2 times boost, and capacitors count is few;
2. charge pump efficient is higher under the equal conditions; Charge pump for 2 times and 1.5 times, suppose that its input voltage is Va, output voltage is Vb, then its efficient is respectively Vb/ (Va*2)=0.5Vb/Va, and Vb/ (Va*1.5) ≈ 0.67Vb/Va, but 1.2 times of charge pumps of the utility model can reach Vb/ (Va*1.2) ≈ 0.83Vb/Va with this understanding.
3. in parallel with 4 pipes as the metal-oxide-semiconductor of the 6th switch, and insert a start-up circuit with these 4 metal-oxide-semiconductor conductings one by one, the metal-oxide-semiconductor operating current in the loop of boosting is progressively strengthened, thereby the loop of boosting have the function of soft start.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing embodiment:
Fig. 1 is a booster circuit schematic diagram of the present utility model;
Fig. 2 is Fig. 1 first step equivalent schematic diagram;
Fig. 3 is Fig. 1 second step equivalent schematic diagram;
Fig. 4 is Fig. 1 third step equivalent schematic diagram;
Fig. 5 is Fig. 1 the 4th step equivalent schematic diagram;
Fig. 6 is the utility model embodiment circuit diagram;
Fig. 7 is the total synoptic chart of Fig. 6 embodiment place SOC (system on a chip);
Fig. 8 is the utility model embodiment grid level sequential chart in Fig. 7;
Fig. 9 is embodiment analogous diagram in Fig. 7 system.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing embodiment:
Fig. 1 is the utility model embodiment one schematic diagram;
Fig. 2 is embodiment one a first step equivalent schematic diagram;
Fig. 3 is embodiment one second a step equivalent schematic diagram;
Fig. 4 is embodiment one a third step equivalent schematic diagram;
Fig. 5 is embodiment 1 the 4th a step equivalent schematic diagram;
Fig. 6 is the utility model embodiment two circuit diagrams;
Fig. 7 is the total synoptic chart of SOC (system on a chip) at embodiment two places;
Fig. 8 is a grid level sequential chart among Fig. 7;
Fig. 9 is embodiment two analogous diagram in Fig. 7 system.
Embodiment
Embodiment one:
Fig. 1 is embodiment one schematic diagram of the present utility model.Three pump stage loops 1 to 3 are arranged among the figure, and each pump stage loop comprises that one flies electric capacity and two switches; Pump stage loop 1 has capacitor C 1 and switch S 1, S5; Pump stage loop 2 has capacitor C 2 and switch S 2, S7, and pump stage loop 3 has capacitor C 3 and switch S 3, S10.Other has a switching network, and by S9, S6, S8 and S11, the pump stage loop of three series connection constitutes booster circuit in the lump therewith.Other has a C4 to be connected in parallel on filtering between output end vo ut and the ground.For convenience of description, capacitor C 1 to C3 has marked positive and negative terminal according to its initial charge/discharge polarity.
The realization that flies electric capacity is exactly the open and close that relies on each switch, makes electric capacity constitute the different networks that discharges and recharges in some cycles, thereby carries out the storage of energy and the operating voltage that transfer obtains demand with different conditions.
Schematic diagram shown in Figure 1 after the perfectly straight stream operating voltage of Vdd termination, makes up according to switch S 1 to S11 different On/Off, reach 4 different steps that wait duration, thereby the formation one-period, this cycle of Infinite Cyclic again, the direct current that can obtain continuing from Vout.
As Fig. 2, the first step equivalent schematic diagram; In this step, the switch S 1 among Fig. 1, S2, S3, S4 remains closed, and all the other keep disconnecting, and then obtain equivalent circuit like this, from then on equivalent circuit can according to Kirchhoff's law obtain following relational expression (Vc1 represents capacitor C 1 both end voltage, Vout open circuit, down with and analogize):
Vdd＝Vc1+Vc2+Vc3.......................................(1)
As Fig. 3, the second step equivalent schematic diagram; In this step, the switch S 5 among Fig. 1, S6 remains closed, and all the other keep disconnecting, and then obtain equivalent circuit like this, and from then on equivalent circuit can obtain following relational expression according to Kirchhoff's law:
Vout＝Vdd+Vc1..........................................(2)
As Fig. 4, the third step equivalent schematic diagram; In this step, the switch S 1 among Fig. 1, S7, S8 remains closed, and all the other keep disconnecting, and then obtain equivalent circuit like this, and from then on equivalent circuit can obtain following relational expression according to Kirchhoff's law:
Vout＝Vdd-Vc1+Vc2....................................(3)
As Fig. 5, the 4th step equivalent schematic diagram; In this step, the switch S 5 among Fig. 1, S9, S10, S11 remains closed, and all the other keep disconnecting, and then obtain equivalent circuit like this, and from then on equivalent circuit can obtain following relational expression according to Kirchhoff's law:
Vout＝Vdd+Vc1-Vc2+Vc3..............................(4)
As the application that flies electric capacity, all switches all are operated in than higher frequency (typical case is at 1M Hz usually), so any saltus step can not take place in all capacitor two ends in stable period, but be consistent, so can the identical variable from above equation substitute each voltage relationship is simplified:
Obtain Vc2=2Vc1 from (2) formula and (3) formula; And then obtain Vc3=2Vc2 according to (4) formula; Vc2=2Vc1 and Vc3=2Vc1, substitution (1) formula obtains Vdd=5Vc1 again, so Vc1=0.2Vdd Vc1=0.2Vdd substitution (2) formula, finally obtains at last:
Vout＝1.2Vdd
So, by this spline structure fly electric capacity and switching network, by the Infinite Cyclic of 4 steps, can set up the relation that this output end vo ut is 1.2 times of input Vdd voltage to earths.What need to indicate is, these 4 step switch transition can not have any state overlapping, and promptly all switches are from before closed (or disconnection) all is converted to disconnections (or closure) state simultaneously in previous step is rapid, and other switches do not have any action.At input voltage Va, during output voltage V b, this charge pump efficient can reach Vb/ (Va*1.2) ≈ 0.83Vb/Va.
Embodiment two:
In practical application, switch is operated in higher frequency, normally adopts the control device with switching function existing, and in SOC (system on a chip), the switch MOS pipe just can be competent at such switching function.Embodiment two circuit diagrams as shown in Figure 6, this embodiment is integrated on the chip, has realized small sizeization, and all metal-oxide-semiconductors all are enhancement mode.
Basically, the source electrode of all metal-oxide-semiconductors and drain electrode directly substitute the position of switch among former Fig. 1, and that different is metal-oxide-semiconductor M6, is the metal-oxide-semiconductor M61 by 4 identical parameters, and 62,63,64 source drains are in parallel to be realized.
Certainly, realize function, also a series of peripheral hardware must be arranged by on-chip circuit shown in Figure 6.As shown in Figure 7, the booster circuit frame among the figure is exactly the content among Fig. 6, and all the other are charge pump circuit outside plants commonly used, and the cycle generator is arranged, and drive circuit and substrate are selected circuit.Wherein the cycle generator is driven by a clock signal, from the input of CLK end, then from the specific clock signal of P1 to P11 end output, by the grid of metal-oxide-semiconductor in the drive circuit control booster circuit, finishes the cycling of charge pump.It should be noted that; cycle takes place to have an A part between circuit and the drive circuit; this A partly is a start-up circuit; its effect is after whole system starts; circuit P6 end Continuity signal takes place effectively down in the cycle, progressively the M61 to M63 among conducting Fig. 6 increases output current step by step; play the function of soft start, protect the safe and reliable of all circuit place chips.It is to select a higher voltage to offer all PMOS pipe substrates in the loop between Vdd and Vout that substrate among the figure is selected the purpose of circuit.Because when circuit has just started, Vout can for realizing the conducting of PMOS pipe, just select Vdd to offer substrate much smaller than Vdd; If a certain moment of Vout, then circuit offered substrate with Vout greater than Vdd; This substrate selects circuit to export the substrate of all PMOS pipes of booster circuit to from the buck end.
Fig. 8 is exactly the grid level sequential chart of Fig. 7 system.The P1 to P11 of metal-oxide-semiconductor grid among P1 to P11 is respectively corresponding Fig. 6 and Fig. 7.As we know from the figure, all rising edge, trailing edges all do not have overlap condition.Corresponding one by one above 4 different steps of Phase1 to Phase4 wherein, these 4 steps constitute complete cycles.In the sequential chart of Fig. 6, a Phase continues about 500ns, so one-period 2 μ s; And waveform rises each other, the about 10ns of delay between the trailing edge.
Fig. 9 embodiment is analogous diagram in Fig. 7 system, and as we know from the figure, 3 stable state Vdd are respectively 3V, and 4V and 5V, corresponding Vout are 3.6V, and 4.8V and 6V have promptly realized Vout=1.2Vdd.
The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented according to this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model contains.
Claims (6)
1. a boosting charge pump comprises that this loop of boosting has power end by flying the loop of boosting that electric capacity and switch are formed, and output and ground connection is characterized in that:
The described loop of boosting comprises that first, second flies electric capacity with the 3rd;
Described first, second flies electric capacity all constitutes same structures separately with two switches first, second and the 3rd pump stage loop with the 3rd, and each pump stage loop all has first, second and the 3rd end, wherein:
The first pump stage loop: form with the 5th switch in parallel by whole after first switch and first capacitances in series; The tie point of first switch and the 5th switch becomes first end; The tie point of first switch and first electric capacity becomes second end; The tie point of first electric capacity and the 5th switch becomes the 3rd end;
The second pump stage loop: be formed in parallel by whole closing after the second switch and second capacitances in series with minion; The tie point that second switch and minion are closed becomes first end: the tie point of the second switch and second electric capacity becomes second end; The tie point that second electric capacity and minion are closed becomes the 3rd end;
The 3rd pump stage loop: constitute with the tenth switch in parallel by whole after the 3rd switch and the 3rd capacitances in series; The tie point of the 3rd switch and the tenth switch becomes first end; The tie point of the 3rd switch and the 3rd electric capacity becomes second end; The tie point of the 3rd electric capacity and the tenth switch becomes the 3rd end:
More than first, second and the 3rd pump stage loop in turn with first end and the 3rd end series aiding connection; The first termination input in the first pump stage loop; The 3rd end in the 3rd pump stage loop is by the 4th switch ground connection;
In addition, second end in the first pump stage loop connects an end of the 9th switch and the 6th switch simultaneously; The other end of the 9th switch is connected with the end that octavo is closed with second end in the second pump stage loop; After being connected, the other end that the other end of the 6th switch and octavo are closed connects described output; Second end in the 3rd pump stage loop connects output by the 11 switch.
A filter capacitor in parallel between described output and the ground.
2. a kind of according to claim 1 boosting charge pump, it is characterized in that: described switch is the electronic switch that comprises metal-oxide-semiconductor.
3. as a kind of boosting charge pump as described in the claim 2, it is characterized in that: described electronic switch prime has by a cycle that has delay feature circuit takes place.
4. as a kind of boosting charge pump as described in the claim 3, it is characterized in that: described the 6th switch is that four source electrodes and drain electrode identical metal-oxide-semiconductor in parallel constitutes, and these four metal-oxide-semiconductor grids and the described cycle take place between the circuit start-up circuit is arranged all.
5. as a kind of boosting charge pump as described in the claim 4, it is characterized in that: described cycle generator and described boosting also have one drive circuit between the loop.
6. as a kind of boosting charge pump as described in each in the claim 2 to 5, it is characterized in that: described loop other parts except that flying electric capacity of boosting are all on same chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206878587U CN201904721U (en) | 2010-12-29 | 2010-12-29 | Voltage-boosting charge pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206878587U CN201904721U (en) | 2010-12-29 | 2010-12-29 | Voltage-boosting charge pump |
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| CN201904721U true CN201904721U (en) | 2011-07-20 |
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| CN2010206878587U Expired - Fee Related CN201904721U (en) | 2010-12-29 | 2010-12-29 | Voltage-boosting charge pump |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208679A (en) * | 2016-07-15 | 2016-12-07 | 武汉华星光电技术有限公司 | A kind of voltage conversion circuit and liquid crystal display drive chip |
| CN107465339A (en) * | 2016-06-03 | 2017-12-12 | 英特矽尔美国有限公司 | The method and circuit of soft-startup large power charge pump |
| CN109039058A (en) * | 2018-08-09 | 2018-12-18 | 安徽矽磊电子科技有限公司 | A kind of electric pressure converter based on configurable switch capacitor |
| CN109980797A (en) * | 2019-04-30 | 2019-07-05 | 复旦大学 | Using the wireless energy receiver and its control method of direct current press pump technology |
-
2010
- 2010-12-29 CN CN2010206878587U patent/CN201904721U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465339A (en) * | 2016-06-03 | 2017-12-12 | 英特矽尔美国有限公司 | The method and circuit of soft-startup large power charge pump |
| CN107465339B (en) * | 2016-06-03 | 2022-03-29 | 英特矽尔美国有限公司 | Method and circuit for soft starting high-power charge pump |
| CN106208679A (en) * | 2016-07-15 | 2016-12-07 | 武汉华星光电技术有限公司 | A kind of voltage conversion circuit and liquid crystal display drive chip |
| WO2018010221A1 (en) * | 2016-07-15 | 2018-01-18 | 武汉华星光电技术有限公司 | Voltage conversion circuit and liquid crystal display chip |
| US10050523B1 (en) | 2016-07-15 | 2018-08-14 | Wuhan China Star Optoelectronics Technology Co., Ltd | Voltage conversion circuit and liquid crystal display driving chip |
| CN109039058A (en) * | 2018-08-09 | 2018-12-18 | 安徽矽磊电子科技有限公司 | A kind of electric pressure converter based on configurable switch capacitor |
| CN109039058B (en) * | 2018-08-09 | 2020-06-26 | 安徽矽磊电子科技有限公司 | Voltage converter based on configurable switched capacitor |
| CN109980797A (en) * | 2019-04-30 | 2019-07-05 | 复旦大学 | Using the wireless energy receiver and its control method of direct current press pump technology |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20141229 |
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| EXPY | Termination of patent right or utility model |