CN113824314A - Charge pump circuit and control method thereof - Google Patents
Charge pump circuit and control method thereof Download PDFInfo
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- CN113824314A CN113824314A CN202110919853.5A CN202110919853A CN113824314A CN 113824314 A CN113824314 A CN 113824314A CN 202110919853 A CN202110919853 A CN 202110919853A CN 113824314 A CN113824314 A CN 113824314A
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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 application provides a charge pump circuit and a control method thereof. Wherein, this charge pump circuit includes: the linear voltage stabilizing circuit is used for carrying out voltage reduction processing on an input voltage signal of the charge pump circuit; the switch circuit is used for outputting an input voltage signal of the charge pump circuit to an output end of the charge pump circuit; the charge pump unit group circuit is used for boosting the input voltage signal of the charge pump circuit; and the input voltage detection circuit is used for detecting the input voltage of the charge pump circuit and respectively controlling the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit to be switched on or switched off according to the input voltage and the target output voltage value of the charge pump circuit. The charge pump circuit suitable for the wide input voltage range is realized, the input voltage value is detected through the input voltage detection circuit, and the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit are respectively controlled, so that the output voltage value is more accurate.
Description
Technical Field
The present disclosure relates to charge pump circuits, and particularly to a charge pump circuit and a control method thereof.
Background
The charge pump circuit is a circuit module for providing a high voltage by boosting, but in many application scenarios, the input voltage of the charge pump circuit is usually not fixed, but is a certain range of values. The conventional charge pump design can not ensure that the charge pump circuit keeps accurate and efficient working state in a wide input voltage range.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present application is to provide a charge pump circuit, which controls a corresponding circuit according to an input voltage and a target output voltage value of the charge pump circuit, so as to accurately output the target voltage value, and not only can satisfy a wider input voltage range, but also can obtain higher working efficiency.
A second objective of the present application is to provide a control method of a charge pump circuit.
To achieve the above object, an embodiment of a first aspect of the present application provides a charge pump circuit, including:
the linear voltage stabilizing circuit is used for carrying out voltage reduction processing on an input voltage signal of the charge pump circuit;
a switching circuit for outputting an input voltage signal of the charge pump circuit to an output terminal of the charge pump circuit;
the charge pump unit group circuit is used for boosting an input voltage signal of the charge pump circuit;
the input end of the input voltage detection circuit is connected with the input end of the charge pump circuit, the output end of the input voltage detection circuit is respectively connected with the input ends of the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit, and the output ends of the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit are respectively connected with the output end of the charge pump circuit;
the input voltage detection circuit is used for detecting the input voltage of the charge pump circuit and respectively controlling the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit to be switched on or switched off according to the input voltage and the target output voltage value of the charge pump circuit.
In some embodiments of the present application, the input voltage detection circuit is specifically configured to:
comparing the input voltage with the target output voltage value in magnitude;
when the input voltage is greater than the target output voltage value, controlling to start the linear voltage stabilizing circuit and controlling to close the switch circuit and the charge pump unit group circuit;
when the input voltage is equal to the target output voltage value, controlling to start the switch circuit and controlling to close the linear voltage stabilizing circuit and the charge pump unit group circuit;
and when the input voltage is smaller than the target output voltage value, controlling to start the charge pump unit group circuit and controlling to close the linear voltage stabilizing circuit and the switch circuit.
In some embodiments of the present application, the target output voltage value is between a first threshold and a second threshold, the first threshold being greater than the second threshold; the input voltage detection circuit is specifically configured to:
when the input voltage is greater than the first threshold value, controlling to start the linear voltage stabilizing circuit and controlling to close the switch circuit and the charge pump unit group circuit;
when the input voltage is smaller than or equal to the first threshold and larger than or equal to the second threshold, controlling to turn on the switch circuit and controlling to turn off the linear voltage stabilizing circuit and the charge pump unit group circuit;
and when the input voltage is smaller than the second threshold value, controlling to start the charge pump unit group circuit and controlling to close the linear voltage stabilizing circuit and the switch circuit.
In some embodiments of the present application, the charge pump cell group circuit comprises at least one charge pump subcell; the input voltage detection circuit is further configured to:
determining the number of the charge pump subunits to be started in the charge pump unit group circuit according to the magnitude of the input voltage;
and controlling to start the charge pump subunits with the corresponding number according to the number to be started.
In some embodiments of the present application, the input voltage detection circuit is specifically configured to:
and determining the number of the charge pump subunits to be started in the charge pump unit group circuit according to the difference value between the input voltage and the second threshold value.
To achieve the above object, a second aspect of the present invention provides a control method for a charge pump circuit, for controlling the charge pump circuit according to the first aspect, including:
detecting an input voltage of the charge pump circuit;
and respectively controlling the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit to be switched on or switched off according to the input voltage and the target output voltage value output by the charge pump circuit.
In some embodiments of the present application, said controlling the linear voltage stabilizing circuit, the switch circuit and the charge pump cell group circuit to be turned on or off according to the input voltage and the target output voltage value output by the charge pump circuit respectively includes:
comparing the input voltage with the target output voltage value in magnitude;
when the input voltage is greater than the target output voltage value, controlling to start the linear voltage stabilizing circuit and controlling to close the switch circuit and the charge pump unit group circuit;
when the input voltage is equal to the target output voltage value, controlling to start the switch circuit and controlling to close the linear voltage stabilizing circuit and the charge pump unit group circuit;
and when the input voltage is smaller than the target output voltage value, controlling to start the charge pump unit group circuit and controlling to close the linear voltage stabilizing circuit and the switch circuit.
In some embodiments of the present application, said controlling the linear voltage stabilizing circuit, the switch circuit and the charge pump cell group circuit to be turned on or off according to the input voltage and the target output voltage value of the charge pump circuit respectively includes:
when the input voltage is greater than the first threshold value, controlling to start the linear voltage stabilizing circuit and controlling to close the switch circuit and the charge pump unit group circuit;
when the input voltage is smaller than or equal to the first threshold and larger than or equal to the second threshold, controlling to turn on the switch circuit and controlling to turn off the linear voltage stabilizing circuit and the charge pump unit group circuit;
and when the input voltage is smaller than the second threshold value, controlling to start the charge pump unit group circuit and controlling to close the linear voltage stabilizing circuit and the switch circuit.
In some embodiments of the present application, the charge pump cell group circuit comprises at least one charge pump subcell; the control turning on the charge pump cell group circuit includes:
determining the number of the charge pump subunits to be started in the charge pump unit group circuit according to the magnitude of the input voltage;
and controlling to start the charge pump subunits with the corresponding number according to the number to be started.
In some embodiments of the present application, the determining, according to the magnitude of the input voltage, a number of to-be-turned-on sub-units of the charge pump in the charge pump unit group circuit includes:
and determining the number of the charge pump subunits to be started in the charge pump unit group circuit according to the difference value between the input voltage and the second threshold value.
According to the technical scheme, the input voltage is detected through the input voltage detection circuit, the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit are controlled to be turned on or turned off respectively according to the input voltage and the target output voltage value of the charge pump circuit, so that the output voltage value is more accurate, the charge pump circuit applicable to a wide input voltage range is realized, a wider input voltage range can be met, and higher working efficiency can be obtained.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a charge pump circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an operating region of a charge pump circuit according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a control method of a charge pump circuit according to an embodiment of the present disclosure;
fig. 4 is a flowchart of another control method of a charge pump circuit according to an embodiment of the present disclosure;
fig. 5 is a flowchart of a control method of a charge pump circuit according to another embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
A charge pump circuit and a control method thereof of the embodiments of the present application are described below with reference to the drawings.
Fig. 1 is a schematic diagram of a charge pump circuit according to an embodiment of the present disclosure. As shown in fig. 1, the charge pump circuit includes a linear voltage stabilizing circuit 110, a switching circuit 120, a charge pump cell group circuit 130, and an input voltage detection circuit 140.
The linear voltage stabilizing circuit 110 is configured to perform voltage reduction processing on the input voltage signal VIN of the charge pump circuit. It should be noted that the linear voltage regulating circuit may include at least one linear voltage regulator.
The switch circuit 120 is configured to output the input voltage signal VIN of the charge pump circuit to the output terminal VOUT of the charge pump circuit.
The charge pump cell group circuit 130 is configured to boost an input voltage signal VIN of the charge pump circuit. As an example, the charge pump cell group circuit 130 includes n charge pump sub-units 131, where n is a positive integer greater than or equal to 1.
The input end of the input voltage detection circuit 140 is connected to the input end VIN of the charge pump circuit, the output end of the input voltage detection circuit 140 is connected to the input ends of the linear voltage stabilizing circuit 110, the switch circuit 120 and the charge pump unit group circuit 130, and the output ends of the linear voltage stabilizing circuit 110, the switch circuit 120 and the charge pump unit group circuit 130 are connected to the output end VOUT of the charge pump circuit.
The input voltage detection circuit 140 is configured to detect an input voltage of the charge pump circuit, and control the linear voltage stabilizing circuit 110, the switch circuit 120, and the charge pump unit group circuit 130 to be turned on or off according to the input voltage and a target output voltage value of the charge pump circuit.
It should be noted that the input voltage detection circuit 140 can control the linear voltage stabilizing circuit 110, the switch circuit 120 and the charge pump cell group circuit 130 to be turned on or off by outputting the control signal. In some embodiments of the present application, the input voltage detection circuit 140 can control the turning on and off of the linear voltage regulator circuit 110 via the control signal ENLDO; the switching circuit 120 is controlled to be turned on and off by a control signal ENSW; the turning on and off of the linear voltage stabilizing circuit 110 is controlled by the control signal ENi.
Alternatively, in some embodiments of the present application, the input voltage detection circuit 140 may compare the input voltage detected by the input voltage detection circuit 140 with a target output voltage value, and control the linear voltage regulating circuit 110, the switch circuit 120 and the charge pump cell group circuit 130 to be turned on or off according to the comparison result. In one implementation, the input voltage detection circuit 140 controls to turn on the linear voltage stabilizing circuit 110 and controls to turn off the switch circuit 120 and the charge pump cell group circuit 130 when the input voltage is greater than the target output voltage value; when the input voltage is equal to the target output voltage value, controlling to turn on the switch circuit 120, and controlling to turn off the linear voltage stabilizing circuit 110 and the charge pump unit group circuit 130; when the input voltage is smaller than the target output voltage value, the charge pump cell group circuit 130 is controlled to be turned on, and the linear voltage stabilizing circuit 110 and the switch circuit 120 are controlled to be turned off.
It should be noted that, in some embodiments of the present application, the input voltage detection circuit 140 may determine the number of the charge pump sub-units 131 to be turned on in the charge pump unit group circuit 130 according to the difference between the input voltage and the target output voltage value. For example, the charge pump cell group circuit 130 includes n charge pump sub-units 131, if the difference between the input voltage and the target output voltage value is not large, i (i is a positive integer greater than or equal to 1 and less than or equal to n) charge pump sub-units 131 are turned on to complete the boosting process of the input voltage, i.e. i is determined to be the number of charge pump sub-units 131 to be turned on in the charge pump circuit, the input voltage detection circuit 140 can control the charge pump cell group 130 to turn on only i charge pump sub-units 131 in the circuit through the number i to be turned on by the control signal ENi, and the operating efficiency can be improved when the charge pump cell group circuit 130 operates.
Alternatively, in some embodiments of the present application, the target output voltage value may be a voltage value within a certain range. For example, the target output voltage value is between a first threshold and a second threshold, where the first threshold is greater than the second threshold, and the input voltage is compared in magnitude with the first threshold and the second threshold of the target output voltage. As an example, fig. 2 is a schematic diagram of an operating region of a charge pump circuit provided in this embodiment of the present application, when an input voltage is greater than a first threshold Vo2, the charge pump circuit operates in an operating region 3, the input voltage detection circuit 140 outputs a control signal to control to turn on the linear voltage stabilizing circuit 110 and control to turn off the switch circuit 120 and the charge pump cell group circuit 130, and the input voltage is output to the output terminal VOUT of the charge pump circuit by being stepped down by the linear voltage stabilizing circuit 110; when the input voltage is less than or equal to the first threshold Vo2 and greater than or equal to the second threshold Vo1, the charge pump circuit operates in the working area 2, the input voltage detection circuit 140 outputs a control signal to control the switch circuit 120 to be turned on and control the linear voltage regulating circuit 110 and the charge pump cell group circuit 130 to be turned off, and the input voltage is directly output to the output terminal VOUT of the charge pump circuit through the switch circuit 120; when the input voltage is less than the second threshold Vo1, the charge pump circuit operates in the operating region 1, the input voltage detection circuit 140 outputs a control signal to control the charge pump cell group circuit 130 to be turned on, and controls the linear voltage regulation circuit 110 and the switch circuit 120 to be turned off, and the input voltage is boosted by the charge pump cell group circuit 130 and output to the output terminal VOUT of the charge pump circuit.
It should be noted that the input voltage detection circuit 140 may determine the number of the charge pump sub-units 131 to be turned on in the charge pump unit group circuit according to the difference between the input voltage and the second threshold Vo 1. Specifically, the charge pump unit group circuit includes n charge pump subunits 131, if the difference between the input voltage and the second threshold Vo1 is not large, i (i is a positive integer greater than or equal to 1 and less than or equal to n) charge pump subunits 131 are turned on to complete the boosting processing of the input voltage, that is, i is determined to be the number of the charge pump subunits 131 to be turned on in the charge pump circuit, and the input voltage detection circuit 140 can control the charge pump unit group 130 to turn on only i charge pump subunits 131 in the circuit through the number i to be turned on by the control signal ENi, so that the working efficiency can be improved when the charge pump unit group circuit works.
According to the charge pump circuit, the input voltage detection circuit can output control signals according to the input signals and the target output signals to control the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit to be turned on or turned off respectively, the target voltage value can be accurately and efficiently output, a wider input voltage range can be met, and higher working efficiency can be obtained. In addition, the number of the charge pump subunits in the charge pump unit group circuit is controlled according to the input voltage, so that the working efficiency of the charge pump circuit can be improved, and power consumption waste possibly caused by power supply voltage change can be avoided.
Fig. 3 is a flowchart of a control method of a charge pump circuit according to an embodiment of the present application, for controlling the charge pump circuit according to any of the embodiments. As shown in fig. 3, the control method of the charge pump circuit may include:
step 301 detects an input voltage of the charge pump circuit.
In some embodiments of the present application, the input voltage of the charge pump circuit may be detected by an input voltage detection circuit.
And step 302, respectively controlling the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit to be switched on or switched off according to the input voltage and the target output voltage value of the charge pump circuit.
The target output voltage may be a fixed value or a voltage value within a certain range. Fig. 4 is a flowchart of a control method of the charge pump circuit when the target output voltage is a fixed value according to this embodiment, and as shown in fig. 4, the control method of the charge pump circuit may include the following steps.
And step 402, controlling to start the linear voltage stabilizing circuit and to close the switch circuit and the charge pump unit group circuit.
Optionally, the linear voltage stabilizing circuit performs voltage reduction processing on the input voltage of the charge pump circuit and outputs the processed voltage value to the output end of the charge pump circuit.
And step 403, controlling to start the switch circuit and to close the linear voltage stabilizing circuit and the charge pump unit group circuit.
Specifically, the switch circuit directly outputs the input voltage of the charge pump circuit to the output terminal of the charge pump circuit.
And step 404, controlling to start the charge pump unit group circuit and to close the linear voltage stabilizing circuit and the switch circuit.
Alternatively, the charge pump cell group circuit performs a boosting process on the input voltage of the charge pump circuit and outputs the processed voltage value to the output terminal of the charge pump circuit.
It should be noted that, in some embodiments, the input voltage detection circuit may further determine the number of charge pump subunits to be turned on in the charge pump circuit according to the magnitude of the input voltage, and control to turn on the corresponding number of charge pump subunits in the charge pump circuit according to the number of turned-on charge pump subunits. For a specific implementation process, reference may be made to the above embodiments, which are not described herein again.
Fig. 5 is a flowchart of a control method of a charge pump circuit with a target output voltage value within a certain range according to this embodiment, where the target output voltage value is between a first threshold and a second threshold, and the first threshold is greater than the second threshold. As shown in fig. 5, the control method of the charge pump circuit may include the following steps.
And 502, controlling to start the linear voltage stabilizing circuit and to close the switch circuit and the charge pump unit group circuit.
Specifically, the linear voltage stabilizing circuit performs voltage reduction processing on the input voltage of the charge pump circuit and outputs the processed voltage value to the output end of the charge pump circuit.
And step 503, controlling to start the switch circuit and to close the linear voltage stabilizing circuit and the charge pump unit group circuit.
Specifically, the switch circuit directly outputs the input voltage of the charge pump circuit to the output terminal of the charge pump circuit.
And step 504, controlling to start the charge pump unit group circuit and to close the linear voltage stabilizing circuit and the switch circuit.
Specifically, the charge pump cell group circuit performs a boosting process on the input voltage of the charge pump circuit and outputs the processed voltage value to the output terminal of the charge pump circuit.
It should be noted that, in some embodiments, the input voltage detection circuit may further determine, according to a difference between the input voltage and the second threshold, a number of charge pump sub-units to be turned on in the charge pump circuit, and control to turn on a corresponding number of charge pump sub-units in the charge pump circuit according to the number of turned-on charge pump sub-units. For a specific implementation process, reference may be made to the above embodiments, which are not described herein again.
According to the control method of the charge pump circuit, the input voltage detection circuit controls the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit to be turned on or turned off respectively through the output control signal according to the input signal and the target output signal, the target voltage value can be accurately and efficiently output, a wider input voltage range can be met, and higher working efficiency can be obtained. In addition, the number of the charge pump subunits in the charge pump unit group circuit is controlled according to the input voltage, so that the working efficiency of the charge pump circuit can be improved, and power consumption waste possibly caused by power supply voltage change can be avoided.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
Claims (10)
1. A charge pump circuit, comprising:
the linear voltage stabilizing circuit is used for carrying out voltage reduction processing on an input voltage signal of the charge pump circuit;
a switching circuit for outputting an input voltage signal of the charge pump circuit to an output terminal of the charge pump circuit;
the charge pump unit group circuit is used for boosting an input voltage signal of the charge pump circuit;
the input end of the input voltage detection circuit is connected with the input end of the charge pump circuit, the output end of the input voltage detection circuit is respectively connected with the input ends of the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit, and the output ends of the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit are respectively connected with the output end of the charge pump circuit;
the input voltage detection circuit is used for detecting the input voltage of the charge pump circuit and respectively controlling the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit to be switched on or switched off according to the input voltage and the target output voltage value of the charge pump circuit.
2. The charge pump circuit of claim 1, wherein the input voltage detection circuit is specifically configured to:
comparing the input voltage with the target output voltage value in magnitude;
when the input voltage is greater than the target output voltage value, controlling to start the linear voltage stabilizing circuit and controlling to close the switch circuit and the charge pump unit group circuit;
when the input voltage is equal to the target output voltage value, controlling to start the switch circuit and controlling to close the linear voltage stabilizing circuit and the charge pump unit group circuit;
and when the input voltage is smaller than the target output voltage value, controlling to start the charge pump unit group circuit and controlling to close the linear voltage stabilizing circuit and the switch circuit.
3. The charge pump circuit of claim 1, wherein the target output voltage value is between a first threshold and a second threshold, the first threshold being greater than the second threshold; the input voltage detection circuit is specifically configured to:
when the input voltage is greater than the first threshold value, controlling to start the linear voltage stabilizing circuit and controlling to close the switch circuit and the charge pump unit group circuit;
when the input voltage is smaller than or equal to the first threshold and larger than or equal to the second threshold, controlling to turn on the switch circuit and controlling to turn off the linear voltage stabilizing circuit and the charge pump unit group circuit;
and when the input voltage is smaller than the second threshold value, controlling to start the charge pump unit group circuit and controlling to close the linear voltage stabilizing circuit and the switch circuit.
4. The charge pump circuit of claim 3, wherein the charge pump cell group circuit comprises at least one charge pump sub-cell; the input voltage detection circuit is further configured to:
determining the number of the charge pump subunits to be started in the charge pump unit group circuit according to the magnitude of the input voltage;
and controlling to start the charge pump subunits with the corresponding number according to the number to be started.
5. The charge pump circuit of claim 4, wherein the input voltage detection circuit is specifically configured to:
and determining the number of the charge pump subunits to be started in the charge pump unit group circuit according to the difference value between the input voltage and the second threshold value.
6. A control method of a charge pump circuit, for controlling the charge pump circuit according to any one of claims 1 to 5; the method comprises the following steps:
detecting an input voltage of the charge pump circuit;
and respectively controlling the linear voltage stabilizing circuit, the switch circuit and the charge pump unit group circuit to be switched on or switched off according to the input voltage and the target output voltage value of the charge pump circuit.
7. The method of claim 6, wherein said controlling the linear voltage regulator circuit, the switch circuit, and the charge pump cell group circuit to be turned on or off according to the input voltage and the target output voltage value of the charge pump circuit respectively comprises:
comparing the input voltage with the target output voltage value in magnitude;
when the input voltage is greater than the target output voltage value, controlling to start the linear voltage stabilizing circuit and controlling to close the switch circuit and the charge pump unit group circuit;
when the input voltage is equal to the target output voltage value, controlling to start the switch circuit and controlling to close the linear voltage stabilizing circuit and the charge pump unit group circuit;
and when the input voltage is smaller than the target output voltage value, controlling to start the charge pump unit group circuit and controlling to close the linear voltage stabilizing circuit and the switch circuit.
8. The method of claim 6, wherein said controlling the linear voltage regulator circuit, the switch circuit, and the charge pump cell group circuit to be turned on or off according to the input voltage and the target output voltage value of the charge pump circuit respectively comprises:
when the input voltage is greater than the first threshold value, controlling to start the linear voltage stabilizing circuit and controlling to close the switch circuit and the charge pump unit group circuit;
when the input voltage is smaller than or equal to the first threshold and larger than or equal to the second threshold, controlling to turn on the switch circuit and controlling to turn off the linear voltage stabilizing circuit and the charge pump unit group circuit;
and when the input voltage is smaller than the second threshold value, controlling to start the charge pump unit group circuit and controlling to close the linear voltage stabilizing circuit and the switch circuit.
9. The method of claim 8, wherein the charge pump cell group circuit comprises at least one charge pump sub-cell; the control turning on the charge pump cell group circuit includes:
determining the number of the charge pump subunits to be started in the charge pump unit group circuit according to the magnitude of the input voltage;
and controlling to start the charge pump subunits with the corresponding number according to the number to be started.
10. The method of claim 9, wherein determining the number of the charge pump sub-units to be turned on in the charge pump cell group circuit according to the magnitude of the input voltage comprises:
and determining the number of the charge pump subunits to be started in the charge pump unit group circuit according to the difference value between the input voltage and the second threshold value.
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| CN202110919853.5A CN113824314A (en) | 2021-08-11 | 2021-08-11 | Charge pump circuit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110919853.5A CN113824314A (en) | 2021-08-11 | 2021-08-11 | Charge pump circuit and control method thereof |
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