CN111371312A - Voltage stabilizing circuit of charge pump - Google Patents
Voltage stabilizing circuit of charge pump Download PDFInfo
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- CN111371312A CN111371312A CN201811604114.1A CN201811604114A CN111371312A CN 111371312 A CN111371312 A CN 111371312A CN 201811604114 A CN201811604114 A CN 201811604114A CN 111371312 A CN111371312 A CN 111371312A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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Abstract
The invention discloses a voltage stabilizing circuit of a charge pump. The charge pump unit comprises a charge pump unit, a driving unit, a comparison unit and a voltage division unit. The voltage division unit comprises a first voltage division subunit and a second voltage division subunit, and the voltage division of the second voltage division subunit is adjustable. The driving unit is electrically connected with the charge pump unit, the comparison unit is electrically connected with the driving unit, the charge pump unit is electrically connected with the first voltage division subunit, the first voltage division subunit is electrically connected with the second voltage division subunit, and the second voltage division subunit is electrically connected with the ground end. After the charge pump voltage stabilizing circuit is connected to a load, the voltage division proportion of the second voltage division subunit is adjusted to be reduced, so that the voltage output by the charge pump unit is greater than the expected voltage, the voltage output by the charge pump voltage stabilizing circuit can be the expected voltage, and the precision of the voltage output by the charge pump voltage stabilizing circuit is improved. Moreover, the phenomenon that the voltage output by the charge pump unit fluctuates around the expected voltage is not caused, so that the speed of the load voltage rising is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of voltage stabilization, in particular to a voltage stabilizing circuit of a charge pump.
Background
With the development of electronic products, portable mobile devices have become a necessity of modern society, and most of these portable mobile devices are powered by batteries. However, many portable mobile devices require higher voltages, such as flash memory, power management chips, etc., and it is difficult to achieve the required voltages by battery power without increasing the size of the portable mobile device. The charge pump voltage stabilizing circuit has the advantages of small area, simple scheme, no electromagnetic interference and the like, and is widely applied to electronic products.
As circuits in electronic systems become increasingly complex, the speed requirements for establishing a charge pump voltage regulator circuit are also increasing. The existing charge pump voltage stabilizing circuit cannot meet the circuit requirements in an electronic system because the existing charge pump voltage stabilizing circuit has slow response to a load and cannot output required output voltage quickly.
Disclosure of Invention
The invention provides a voltage stabilizing circuit of a charge pump, which is used for quickly establishing load voltage and improving the accuracy of the output voltage of the voltage stabilizing circuit of the charge pump.
In a first aspect, an embodiment of the present invention provides a charge pump voltage stabilizing circuit, including a charge pump unit, a driving unit, a comparing unit, and a voltage dividing unit;
the voltage division unit comprises a first voltage division subunit and a second voltage division subunit, and the voltage division of the second voltage division subunit is adjustable;
the driving unit is electrically connected with the charge pump unit, and the comparison unit is electrically connected with the driving unit; the charge pump unit is electrically connected with the first voltage-dividing subunit, and the first voltage-dividing subunit is electrically connected with the second voltage-dividing subunit; the second voltage division subunit is electrically connected with a ground end; the comparison unit is electrically connected with the common end of the first voltage division subunit and the second voltage division subunit.
Optionally, the second voltage dividing subunit comprises a plurality of voltage dividing parts and at least one switching part;
the voltage dividing parts are connected in series, and each switching part is connected with one of the voltage dividing parts in parallel.
Optionally, the voltage dividing part corresponds to the switch parts one to one, and at least one of the switch parts is disconnected.
Optionally, the second voltage dividing subunit comprises five voltage dividing parts and five switching parts;
the five voltage dividing parts are connected in series, and each switch part is connected with each voltage dividing part in parallel; at least one of the switching sections is turned off.
Optionally, the number of the voltage dividing parts is greater than that of the switching parts, and the switching parts and part of the voltage dividing parts are connected in parallel in a one-to-one correspondence manner.
Optionally, the second voltage dividing subunit comprises five voltage dividing parts and four switch parts;
five voltage division parts are connected in series, and each switch part is connected with one voltage division part in parallel.
Optionally, the voltage dividing part is a resistor, and the switching part is a switch or a transistor.
Optionally, the charge pump unit comprises a plurality of charge pumps; a plurality of the charge pumps are connected in parallel.
Optionally, the comparison unit is a comparator; the inverting input end of the comparator is electrically connected with the second voltage-dividing subunit; a reference voltage is input to a positive phase input end of the comparator; the output end of the comparator is electrically connected with the input end of the driving unit.
Optionally, the charge pump unit further comprises a first switch, and a first end of the first switch is electrically connected to a common end of the charge pump unit and the first voltage-dividing subunit; and the second end of the first switch is used as the output end of the charge pump voltage stabilizing circuit.
According to the technical scheme, the charge pump voltage stabilizing circuit comprises a charge pump unit, a driving unit, a comparing unit and a voltage dividing unit, wherein the voltage dividing unit comprises a first voltage dividing subunit and a second voltage dividing subunit, and the voltage division of the second voltage dividing subunit is adjustable. After the charge pump voltage stabilizing circuit is connected to a load, the voltage division proportion of the second voltage division subunit is adjusted to be reduced, so that the voltage output by the charge pump unit is greater than the expected voltage, the voltage output by the charge pump voltage stabilizing circuit can be the expected voltage, and the precision of the voltage output by the charge pump voltage stabilizing circuit is improved. In addition, the charge pump unit supplies power before the charge pump voltage stabilizing circuit outputs the expected voltage, so that the phenomenon that the voltage output by the charge pump unit fluctuates around the expected voltage is avoided, and the speed of the voltage rise of the output end of the charge pump voltage stabilizing circuit, namely the speed of the load voltage rise is improved.
Drawings
FIG. 1 is a schematic diagram of a charge pump voltage regulator circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an output voltage of a charge pump unit and an output voltage of a charge pump voltage stabilizing circuit after a load is connected to the charge pump voltage stabilizing circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another exemplary embodiment of a charge pump voltage regulator circuit;
FIG. 4 is a schematic diagram of another exemplary embodiment of a charge pump voltage regulator circuit;
FIG. 5 is a schematic diagram of another exemplary embodiment of a charge pump voltage regulator circuit;
FIG. 6 is a schematic diagram of another exemplary embodiment of a charge pump voltage regulator circuit;
FIG. 7 is a schematic diagram of another exemplary embodiment of a charge pump voltage regulator circuit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a charge pump voltage stabilizing circuit according to an embodiment of the present invention, as shown in fig. 1, the charge pump voltage stabilizing circuit includes a charge pump unit 10, a driving unit 20, a comparing unit 30, and a voltage dividing unit 40. The voltage dividing unit 40 includes a first voltage dividing subunit 41 and a second voltage dividing subunit 42, and the voltage division of the second voltage dividing subunit 42 is adjustable. The driving unit 20 is electrically connected to the charge pump unit 10, the comparing unit 30 is electrically connected to the driving unit 20, the charge pump unit 10 is electrically connected to the first voltage-dividing subunit 41, the first voltage-dividing subunit 41 is electrically connected to the second voltage-dividing subunit 42, the second voltage-dividing subunit 42 is electrically connected to the ground GND, and the comparing unit 30 is electrically connected to the common terminal C of the first voltage-dividing subunit 41 and the second voltage-dividing subunit 42.
Specifically, as shown in fig. 1, the charge pump unit 10 includes a charge pump, which is also called a switched capacitor voltage converter, wherein the arrayed switches control the charging and discharging of the capacitor in a certain manner, so that the input voltage can be multiplied or reduced by a certain factor. The input terminal of the charge pump unit 10 is electrically connected to the input terminal Vin of the charge pump voltage regulator circuit, and the output terminal PVout of the charge pump unit 10 is electrically connected to the output terminal Vout of the charge pump voltage regulator circuit through the switch unit 50, so that the charge pump unit 10 can convert the voltage input by the charge pump voltage regulator circuit and output the converted voltage. The control terminal of the charge pump unit 10 is electrically connected to the output terminal of the driving unit 20. When the charge pump voltage regulator circuit supplies power to the load, the switch unit 50 is turned on, and the output end PVout of the charge pump unit 10 can output a voltage to the output end Vout of the charge pump voltage regulator circuit. Illustratively, the switch unit 50 may be a first switch, a first terminal of which is electrically connected to the common terminal a of the charge pump unit 10 and the first voltage-dividing subunit 41, and a second terminal of which serves as an output terminal of the charge pump voltage-stabilizing circuit. By setting the on and off of the first switch, the conduction between the output terminal PVout of the charge pump unit 10 and the output terminal Vout of the charge pump voltage regulator circuit can be controlled.
The output voltage of the charge pump unit 10 is controlled by the driving unit 20. When the driving unit 20 outputs a control signal to the charge pump, the charge pump operates according to the control signal, that is, the voltage at the input terminal Vin of the voltage stabilizing circuit of the charge pump is converted and then output to the output terminal Vout of the voltage stabilizing circuit of the charge pump. The control signal output by the driving unit 20 may be a clock signal, and the clock signal controls the switch in the charge pump to be turned on or off, so as to control the operation of the charge pump.
The output terminal of the comparing unit 30 is electrically connected to the enable input terminal of the driving unit 20, and whether the driving unit 20 outputs the control signal is controlled by the signal output by the comparing unit 30. Illustratively, when the comparing unit 30 outputs the first level, the driving unit 20 works normally, and can output a control signal to control the charge pump unit 10 to convert the voltage at the input terminal Vin of the input terminal of the charge pump voltage stabilizing circuit for outputting. When the comparing unit 30 outputs the second level, the driving unit 20 stops operating, and the driving unit 20 does not output the control signal, and the charge pump unit 10 cannot output the voltage. For example, the comparing unit 30 may be a comparator, an inverting input terminal of which is electrically connected to the second voltage dividing subunit 42, a non-inverting input terminal of which is input with the reference voltage Vref, and an output terminal of which is electrically connected to the input terminal of the driving unit 20. At this time, the first level may be set to be a high level, the second level may be set to be a low level, the divided voltage signal VFB output by the voltage dividing unit 40 is input to the inverting input terminal of the comparator, and the reference signal Vref is input to the non-inverting input terminal of the comparator. When the voltage output by the charge pump unit 10 is relatively small, the divided voltage signal VFB is smaller than the reference signal Vref, the comparator outputs a high level, and the driving unit 20 operates normally, so that the charge pump unit 10 outputs the voltage. When the voltage output by the charge pump unit 10 is relatively large, the divided voltage signal VFB is greater than the reference signal Vref, the comparator outputs a low level, the driving unit 20 stops working, and the charge pump unit 10 does not output a voltage.
The divided voltage signal VFB is related to the voltage output by the charge pump unit 10, and generally, the first voltage dividing unit 41 and the second voltage dividing unit 42 in the voltage dividing unit 40 divide the voltage output by the output terminal PVout of the charge pump unit 10, and the divided voltage signal VFB is proportional to the voltage output by the charge pump unit 10. The reference signal Vref may be set as a voltage division signal VFB output by the voltage division unit 40 when the output terminal Vout of the charge pump voltage stabilizing circuit outputs a desired voltage. That is, when the output terminal Vout of the charge pump voltage stabilizing circuit outputs the desired voltage, the divided voltage signal VFB is equal to the reference signal Vref. Wherein the desired voltage is a voltage supplied by the charge pump voltage stabilizing circuit. The voltage value output by the output terminal PVout of the charge pump unit 10 is adjusted by comparing the magnitudes of the divided voltage signal VFB and the reference signal Vref. Illustratively, when the voltage outputted by the output terminal PVout of the charge pump unit 10 is less than the desired voltage, the divided voltage signal VFB is less than the reference signal Vref, and at this time, the comparing unit 30 outputs the enable signal of the first level to control the driving unit 20 to operate, and the driving unit 20 controls the charge pump unit 10 to supply power until the desired voltage is outputted. When the voltage output by the output terminal PVout of the charge pump unit 10 is greater than the desired voltage, the divided voltage signal VFB is greater than the reference signal Vref, and at this time, the comparison unit 30 outputs the enable signal of the second level to control the driving unit 20 to stop working, that is, the charge pump unit 10 does not supply power, until the voltage output by the charge pump unit 10 is less than the desired voltage, the charge pump unit 10 does not start supplying power. The voltage output by the charge pump unit 10 fluctuates around the desired voltage.
The partial pressure of the second partial pressure subunit 42 is adjustable. Before the charge pump voltage stabilizing circuit is connected to the load, the voltage division ratio of the second voltage division subunit 42 may be set to the first ratio, and the proportional relationship between the voltage division signal VFB and the voltage output by the output terminal PVout of the charge pump unit 10 is the first ratio. At this time, the reference signal Vref is set to be a voltage obtained by dividing the desired voltage by the first proportion, so whether the driving unit 20 operates or not can be controlled by the comparing unit 30, and the driving unit 20 controls the voltage output by the charge pump unit 10 to fluctuate around the desired voltage.
After the charge pump voltage stabilizing circuit is connected to the load, the voltage at the output terminal Vout of the charge pump voltage stabilizing circuit is lower than the voltage at the output terminal PVout of the charge pump unit 10 due to the existence of the switch unit 50 and the load capacitor CL, so that the output terminal Vout of the charge pump voltage stabilizing circuit cannot reach the desired voltage. And the voltage at the output terminal Vout of the charge pump voltage stabilizing circuit is delayed with respect to the voltage at the output terminal PVout of the charge pump unit 10, and when the product of the resistance value of the switch unit 50 and the load capacitor CL is larger, the time constant is larger, and the delay time is longer. In addition, the charge pump unit 10 supplies power to the load, and the power at the output end PVout of the charge pump unit 10 is continuously consumed, so that the voltage is reduced. When the voltage at the output terminal PVout of the charge pump unit 10 is lower than the voltage at the output terminal PVout of the charge pump unit 10, the charge pump unit 10 will supply power to reach the desired voltage, and therefore the voltage at the output terminal PVout of the charge pump unit 10 will fluctuate around the desired voltage, so that the load voltage will rise slowly. At this time, the voltage division ratio of the second voltage division subunit 42 is adjusted to be set to be the second ratio, and the second ratio is smaller than the first ratio, the ratio relationship between the divided voltage signal VFB and the voltage output by the output terminal PVout of the charge pump unit 10 is the second ratio, the reference signal Vref is the voltage obtained after the second voltage division subunit 42 divides the desired voltage by the first ratio, therefore, when the voltage output by the output terminal PVout of the charge pump unit 10 is the desired voltage, the divided voltage signal VFB is smaller than the reference signal Vref, the comparison unit 30 outputs the enable signal to control the operation of the driving unit 20, and the driving unit 20 controls the charge pump unit 10 to continue to supply power until the divided voltage signal VFB is equal to the reference signal Vref. Therefore, when the voltage of the divided voltage signal VFB is equal to the reference signal Vref, the voltage output by the output terminal PVout of the charge pump unit 10 is greater than the desired voltage, and the voltage at the output terminal Vout of the charge pump voltage stabilizing circuit is made to be the desired voltage after the voltage drop of the switch unit 50 and the load capacitor, thereby improving the accuracy of the output voltage of the charge pump voltage stabilizing circuit. Moreover, the charge pump unit 10 supplies power until the output terminal Vout of the charge pump voltage stabilizing circuit outputs the desired voltage, so that the voltage output from the output terminal PVout of the charge pump unit 10 does not fluctuate around the desired voltage, thereby increasing the speed of the voltage rise at the output terminal Vout of the charge pump voltage stabilizing circuit, i.e., increasing the speed of the load voltage rise.
Fig. 2 is a schematic diagram of an output voltage of a charge pump unit and an output voltage of a charge pump voltage stabilizing circuit after a load is connected to the charge pump voltage stabilizing circuit according to an embodiment of the present invention. As shown in fig. 2, the abscissa is time t, the ordinate is voltage value V, the voltage division ratio of the second voltage division subunit 42 is the second ratio, curve 1 is a graph of the output voltage of the charge pump unit, and curve 2 is a graph of the output voltage of the charge pump voltage regulator circuit. Before the off point, the divided voltage signal VFB is smaller than the reference signal Vref, the charge pump unit is powered all the time, and the voltage output by the charge pump unit is made to be smaller than the voltage output by the charge pump unit through the loss of the switch unit 50 and the load capacitor CL. At the off point, the divided voltage signal VFB is equal to the reference signal Vref, the charge pump unit stops supplying power, and the voltage output by the charge pump voltage stabilizing circuit is made to be the desired voltage through the loss of the switch unit 50 and the load capacitor CL.
According to the technical scheme, the charge pump voltage stabilizing circuit comprises a charge pump unit, a driving unit, a comparing unit and a voltage dividing unit, wherein the voltage dividing unit comprises a first voltage dividing subunit and a second voltage dividing subunit, and voltage division of the second voltage dividing subunit is adjustable. After the charge pump voltage stabilizing circuit is connected to a load, the voltage division proportion of the second voltage division subunit is adjusted to be reduced, so that the voltage output by the charge pump unit is greater than the expected voltage, the voltage output by the charge pump voltage stabilizing circuit can be the expected voltage, and the precision of the voltage output by the charge pump voltage stabilizing circuit is improved. In addition, the charge pump unit supplies power before the charge pump voltage stabilizing circuit outputs the expected voltage, so that the phenomenon that the voltage output by the charge pump unit fluctuates around the expected voltage is avoided, and the speed of the voltage rise of the output end of the charge pump voltage stabilizing circuit, namely the speed of the load voltage rise is improved.
On the basis of the technical schemes, the second voltage division subunit comprises a plurality of voltage division parts and at least one switch part. A plurality of voltage division parts are connected in series, and each switch part is connected with one of the voltage division parts in parallel.
Specifically, the first voltage dividing subunit and the second voltage dividing subunit divide the voltage output by the charge pump unit. The first voltage dividing subunit may include at least one resistor, and each voltage dividing portion in the second voltage dividing subunit may be one or more resistors. Therefore, the first voltage dividing subunit and each voltage dividing part divide the voltage output by the charge pump unit, and the plurality of voltage dividing parts are connected in series between the first voltage dividing subunit and the ground terminal, so that each voltage dividing part can divide the voltage between the first voltage dividing subunit and the ground terminal, and the sum of the divided voltages of the plurality of voltage dividing parts is the voltage obtained by dividing the voltage output by the charge pump unit by the second voltage dividing subunit. Each switch part is connected with one of the voltage dividing parts in parallel, when the switch part is closed, the voltage dividing part connected with the switch part in parallel is short-circuited by the switch part, and the voltage dividing part divides the voltage output by the charge pump unit into zero. When the switch part is turned off, the voltage division part connected in parallel with the switch part can normally divide the voltage output by the charge pump unit. Therefore, the voltage division of the voltage division part can be controlled by controlling the on and off of each switch part, so that the voltage division of the second voltage division subunit can be adjusted, the voltage division proportion of the second voltage division subunit is reduced, the voltage output by the charge pump unit is greater than the expected voltage, the voltage output by the charge pump voltage stabilizing circuit is the expected voltage, and the precision of the voltage output by the charge pump voltage stabilizing circuit is improved. In addition, the charge pump unit supplies power before the charge pump voltage stabilizing circuit outputs the expected voltage, so that the phenomenon that the voltage output by the charge pump unit fluctuates around the expected voltage is avoided, and the speed of the voltage rise of the output end of the charge pump voltage stabilizing circuit, namely the speed of the load voltage rise is improved.
For example, fig. 3 is a schematic structural diagram of another charge pump voltage stabilizing circuit according to an embodiment of the present invention, and as shown in fig. 3, the second voltage dividing subunit 42 includes a plurality of voltage dividing parts 421 and a plurality of switch parts 422. The voltage dividing part 421 corresponds to the switch parts 422 one by one, and at least one switch part 422 is disconnected.
Specifically, as shown in fig. 3, each voltage dividing part 421 may be one resistor, and when the second voltage dividing subunit 42 includes five voltage dividing parts 421 and five switching parts 422, the five voltage dividing parts 421 of the second voltage dividing unit 42 may be a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected in series. Each switch portion 422 is connected in parallel to each voltage dividing portion 421, and whether each resistor divides the voltage output by the charge pump unit 10 is controlled by controlling the on or off of the switch portion 422, so that the divided voltage of the second voltage dividing subunit 42 can be adjusted by adjusting the on or off of each switch portion 422. When the voltage dividing part 421 corresponds to the switch part 422, at least one switch part 422 is turned off to ensure that at least one voltage dividing part 421 in the second voltage dividing subunit 42 divides the voltage output by the charge pump unit 10, so that the voltage dividing effect of the first voltage dividing subunit 41 and the second voltage dividing subunit 42 can be ensured.
For example, as shown in fig. 3, the switch portion 422 may include a first switch S1, a second switch S2, a third switch S3, a fourth switch S4 and a fifth switch S5, wherein the first switch S1, the second switch S2, the third switch S3, the fourth switch S4 and the fifth switch S5 are respectively connected in parallel with a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5. At least one of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4 and the fifth switch S5 is always in an off state to ensure that the second voltage dividing subunit 42 has a voltage dividing function, for example, the first switch S1 is always in an off state, and the first resistor R1 can divide the voltage output by the charge pump unit 10.
Before the charge pump voltage stabilizing circuit is connected to a load, the voltage division ratio of the second voltage dividing subunit 42 is relatively large, and at this time, the maximum voltage division ratio of the second voltage dividing subunit 42 may be set, that is, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5 are all turned off, at this time, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 all divide the voltage output by the charge pump unit 10, and the voltage division ratio of the second voltage dividing subunit 42 reaches the maximum. When the charge pump voltage stabilizing circuit is connected to a load, the voltage division ratio of the second voltage dividing subunit 42 is reduced, and at this time, the minimum voltage division ratio of the second voltage dividing subunit 42 may be set, that is, only one of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5 is open, which may be exemplarily the first switch S1, and the other switches are closed, and only one resistor divides voltage. The voltage dividing ratio of the second voltage dividing subunit 42 can be adjusted by adjusting the closing and opening of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5.
The adjustment level of the voltage dividing ratio of the second voltage dividing subunit 42 can be determined according to the number of the voltage dividing part 421 and the switch part 422. For example, when the voltage dividing portion 421 corresponds to the switch portion 422, one switch portion 422 may be set to be always in an open state, and the other switch portions 422 may be opened and closed to adjust the adjustment level of the voltage dividing ratio of the second voltage dividing subunit 42. As shown in fig. 3, when the first switch S1 is always in the open state, the second voltage dividing subunit 42 can have a total of 5 voltage dividing ratios by adjusting the on and off states of the second switch S2, the third switch S3, the fourth switch S4 and the fifth switch S5, so that the second voltage dividing subunit 42 can adjust the voltage dividing ratio of the second voltage dividing subunit 42 according to the sizes of the different switch units 50 and the load capacitors CL to meet the requirements of different loads.
In fig. 3, the voltage dividing unit 421 is a resistor, and the switch unit 422 is a switch, for example. In addition, the switch portion 422 may be a transistor. Fig. 4 is a schematic structural diagram of another charge pump voltage stabilizing circuit according to an embodiment of the present invention, and as shown in fig. 4, the switch portion 422 may also be a transistor, so that the five switch portions 422 may be a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, and a fifth transistor T5, respectively. One of the five transistors is always in the off state, for example, the first transistor T1, and the other transistors can adjust the voltage division ratio of the second voltage division subunit 42 by controlling the on or off state thereof. The process is the same as the switch and is not described in detail here.
Fig. 5 is a schematic structural diagram of another charge pump voltage stabilizing circuit according to an embodiment of the present invention, as shown in fig. 5, the number of the voltage dividing parts 421 is greater than the number of the switch parts 422, and the switch parts 421 are connected in parallel with the voltage dividing parts 421 in a one-to-one correspondence manner.
Specifically, when the voltage dividing portions 421 correspond to the switch portions 422 one to one, at least one of the switch portions 422 is in an off state, for example, in fig. 3 and 4, one of the switch portions 422 is always in an off state, so as to ensure the voltage dividing function of the second voltage dividing subunit 42. Therefore, the number of the voltage dividing parts 421 may be larger than the number of the switch parts 422, so that the voltage output by the charge pump unit 10 may be divided at all times by controlling a part of the voltage dividing parts 421 without the switch parts 422. The remaining partial voltage-dividing portions 421 correspond to the switch portions 422 one-to-one, and the voltage-dividing of the partial voltage-dividing portions 421 is controlled by the switch portions 422. A part of the voltage dividing part 421 is not short-circuited by the switch part 422, and the voltage output by the charge pump unit 10 is always divided, so that the voltage dividing function of the second voltage dividing subunit 42 is ensured. When the switch portions 422 are both closed, the second voltage dividing subunit 42 can still divide the voltage, so that all the switch portions 422 can be closed or opened. Illustratively, as shown in fig. 5, the second voltage dividing subunit 42 includes five voltage dividing parts 421 and four switching parts 422, where the five voltage dividing parts 421 are a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, respectively, and the five resistors are connected in series. The four switching sections 422 may be a second switch S2, a third switch S3, a fourth switch S4, and a fifth switch S5. Each switching section 422 is connected in parallel with one voltage dividing section 421. The second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5 may be respectively connected in parallel with the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5, at this time, the first resistor R1 always divides the voltage output by the charge pump unit 10, so as to ensure the voltage dividing function of the second voltage dividing subunit 42. The voltage dividing ratio of the second voltage dividing subunit 42 is adjusted by adjusting the closing or opening of the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5. And the four switches can also realize that the second voltage-dividing subunit 42 has 5 voltage-dividing ratios, so that the second voltage-dividing subunit 42 can adjust the voltage-dividing ratio of the second voltage-dividing subunit 42 according to different switch units 50 and sizes of the load capacitors CL to meet different load requirements. The number of the switch portions 422 can be reduced compared to a one-to-one configuration in which the voltage dividing portion 421 and the switch portions 422 correspond to each other.
The switching portion 422 may also be a transistor. Fig. 6 is a schematic structural diagram of another charge pump voltage stabilizing circuit according to an embodiment of the present invention, as shown in fig. 6, the switch portion 422 includes four transistors, which are respectively a second transistor T2, a third transistor T3, a fourth transistor T4, and a fifth transistor T5, and are respectively connected in parallel with a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5, and the voltage dividing ratio of the second voltage dividing subunit 42 can be adjusted by controlling on or off states of the second transistor T2, the third transistor T3, the fourth transistor T4, and the fifth transistor T5.
Based on the above embodiments, fig. 7 is a schematic structural diagram of another charge pump voltage stabilizing circuit according to an embodiment of the present invention, and as shown in fig. 7, the charge pump unit 10 may include a plurality of charge pumps, and the plurality of charge pumps are connected in parallel.
Specifically, when the charge pump unit 10 includes a plurality of charge pumps, the plurality of charge pumps are connected in parallel, and can simultaneously supply power to the charge pump voltage stabilizing circuit, so that the output current can be increased, and the load capacity of the charge pump voltage stabilizing circuit can be improved. In addition, when the load is smaller, the output voltage of the charge pump voltage stabilizing circuit can be established by using a plurality of charge pumps connected in parallel in the process of establishing the output voltage of the charge pump voltage stabilizing circuit, the establishment speed of the output voltage of the charge pump voltage stabilizing circuit is accelerated, and after the output voltage of the charge pump voltage stabilizing circuit is established, less charge pumps are used for supplying power. Therefore, the parallel connection of the plurality of charge pumps can improve the speed of the output voltage of the charge pump voltage stabilizing circuit.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A charge pump voltage stabilizing circuit is characterized by comprising a charge pump unit, a driving unit, a comparing unit and a voltage dividing unit;
the voltage division unit comprises a first voltage division subunit and a second voltage division subunit, and the voltage division of the second voltage division subunit is adjustable;
the driving unit is electrically connected with the charge pump unit, and the comparison unit is electrically connected with the driving unit; the charge pump unit is electrically connected with the first voltage-dividing subunit, and the first voltage-dividing subunit is electrically connected with the second voltage-dividing subunit; the second voltage division subunit is electrically connected with a ground end; the comparison unit is electrically connected with the common end of the first voltage division subunit and the second voltage division subunit.
2. The charge pump voltage regulator circuit of claim 1, wherein the second voltage dividing subunit comprises a plurality of voltage dividing sections and at least one switching section;
the voltage dividing parts are connected in series, and each switching part is connected with one of the voltage dividing parts in parallel.
3. The charge pump voltage regulator circuit of claim 2, wherein the voltage dividing sections are in one-to-one correspondence with the switching sections, and at least one of the switching sections is turned off.
4. The charge pump voltage regulator circuit of claim 3, wherein the second voltage dividing subunit comprises five of the voltage dividing sections and five of the switching sections;
the five voltage dividing parts are connected in series, and each switch part is connected with each voltage dividing part in parallel; at least one of the switching sections is turned off.
5. The charge pump voltage stabilizing circuit of claim 2, wherein the number of the voltage dividing parts is greater than the number of the switching parts, and the switching parts are connected in parallel with part of the voltage dividing parts in a one-to-one correspondence manner.
6. The charge pump voltage regulator circuit of claim 5, wherein the second voltage dividing subunit comprises five voltage dividing sections and four switch sections;
five voltage division parts are connected in series, and each switch part is connected with one voltage division part in parallel.
7. The charge pump voltage regulator circuit according to any one of claims 2 to 6, wherein the voltage divider is a resistor and the switch is a switch or a transistor.
8. The charge pump voltage regulation circuit of claim 1, wherein the charge pump unit comprises a plurality of charge pumps; a plurality of the charge pumps are connected in parallel.
9. The charge pump voltage regulator circuit of claim 1, wherein the comparison unit is a comparator; the inverting input end of the comparator is electrically connected with the second voltage-dividing subunit; a reference voltage is input to a positive phase input end of the comparator; the output end of the comparator is electrically connected with the input end of the driving unit.
10. The charge pump voltage regulation circuit of claim 1, further comprising a first switch, a first terminal of the first switch being electrically connected to a common terminal of the charge pump unit and the first voltage dividing sub-unit; and the second end of the first switch is used as the output end of the charge pump voltage stabilizing circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811604114.1A CN111371312A (en) | 2018-12-26 | 2018-12-26 | Voltage stabilizing circuit of charge pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811604114.1A CN111371312A (en) | 2018-12-26 | 2018-12-26 | Voltage stabilizing circuit of charge pump |
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| CN111371312A true CN111371312A (en) | 2020-07-03 |
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| CN201811604114.1A Pending CN111371312A (en) | 2018-12-26 | 2018-12-26 | Voltage stabilizing circuit of charge pump |
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| CN102064685A (en) * | 2009-11-18 | 2011-05-18 | 上海宏力半导体制造有限公司 | Charge pump device and voltage stabilizing method thereof |
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| US20170054372A1 (en) * | 2015-08-20 | 2017-02-23 | Samsung Electronics Co., Ltd. | Internal voltage trimming device and semiconductor integrated circuit including the same |
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| CN102064685A (en) * | 2009-11-18 | 2011-05-18 | 上海宏力半导体制造有限公司 | Charge pump device and voltage stabilizing method thereof |
| CN102290984A (en) * | 2011-08-26 | 2011-12-21 | 北京兆易创新科技有限公司 | Charge pump voltage-stabilizing circuit, method for improving output accuracy of same and storage chip |
| US20150029806A1 (en) * | 2013-04-18 | 2015-01-29 | Micron Technology, Inc. | Voltage control integrated circuit devices |
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Application publication date: 20200703 |