Charge pump control method and charge pump

Abstract

The invention provides a charge pump control method and a charge pump. The charge pump comprises an input end, at least two stages of cascaded pump circuits, an output circuit and an output end which are connected in sequence, controlling the charge pump to operate in a single-stage and multi-stage pump switching mode; detecting the input voltage of the input end; and judging whether the input voltage exceeds a preset reference value, if so, controlling the charge pump to operate in a single-stage pump mode, and if not, controlling the charge pump to operate in a multi-stage pump mode. In the single-stage pump mode, only one-stage pump circuit works, and in the multi-stage pump mode, the multi-stage pump circuit works; in the operation process of the charge pump, a working pump circuit is controlled, so that the pump circuit is switched between a charging state and a discharging state; in the multi-stage pump mode, the charging state and the discharging state of the last-stage pump circuit and the charging state and the discharging state of the other at least one-stage pump circuit are mutually opposite. According to the technical scheme, switching between the single-stage pump mode and the multi-stage pump mode can be achieved according to the magnitude of the input voltage, and the balance between the loading capacity and the efficiency is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of charge pumps, and in particular to a charge pump control method and a charge pump. Background Art

[0002] Charge pumps are widely used in low-power power supply applications due to their small size, easy integration and simple structure.

[0003] Traditional charge pumps have only one fixed working mode during operation, poor flexibility, and are unable to cope with various power supply or load application scenarios, and are unable to achieve a balance between load capacity and efficiency. For example, a charge pump with only one pump circuit has only one single-stage pump operating mode during operation, poor flexibility, and insufficient load capacity when the power supply voltage is relatively low. Summary of the invention

[0004] The present invention provides a control method for a charge pump and a charge pump, so as to solve the problems in the prior art of poor flexibility and inability to achieve a balance between load capacity and efficiency.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] According to a first aspect of the present invention, a charge pump control method is provided, for controlling a charge pump;

[0007] The charge pump comprises: an input end, at least two stages of cascaded pump circuits, an output circuit, and an output end connected in sequence; the output circuit is used to control the on-off between the pump circuit of the last stage and the output end;

[0008] The control method comprises: controlling the charge pump to operate in a single-stage or multi-stage pump switching mode;

[0009] Specifically, it includes:

[0010] detecting an input voltage at the input terminal;

[0011] It is determined whether the input voltage exceeds a preset reference value. If yes, the charge pump is controlled to operate in a single-stage pump mode. If no, the charge pump is controlled to operate in a multi-stage pump mode.

[0012] Wherein, in the single-stage pump mode, only one stage of the pump circuit works, and in the multi-stage pump mode, multiple stages of the pump circuit work;

[0013] During the operation of the charge pump, the working pump circuit is controlled to switch between a charging state and a discharging state; in the multi-stage pump mode, the charging state and the discharging state of the pump circuit of the last stage are opposite to those of the pump circuit of at least one remaining stage;

[0014] In the single-stage pump mode, when the working pump circuit is in a charging state, the output circuit is in an off state; when the working pump circuit is in a discharging state, the output circuit is in an on state;

[0015] In the multi-stage pump mode, when the pump circuit of the last working stage is in a charging state, the output circuit is in an off state, and when the pump circuit of the last working stage is in a discharging state, the output circuit is in an on state.

[0016] Optionally, the controlling the charge pump to operate in a single-stage or multi-stage pump switching mode further includes:

[0017] Determining the operating mode of the charge pump according to the load requirement;

[0018] Specifically include:

[0019] When the load requirement is less than or equal to a first preset load value, determining that the operation mode of the charge pump is a single-stage pump mode;

[0020] When the load requirement is greater than the first preset load value and less than or equal to the second preset load value, determining that the operation mode of the charge pump is a single-stage multi-stage pump switching mode;

[0021] When the load requirement is greater than a third preset load value, the operation mode of the charge pump is determined to be a multi-stage pump mode.

[0022] Optionally, also include:

[0023] Performing real-time detection on the voltage difference between the output terminal and the input terminal to obtain a voltage difference value;

[0024] Determine whether the voltage difference value exceeds the upper limit of the hysteresis voltage window, and if so, output a frequency hopping modulation signal to perform frequency hopping control on the working pump circuit and the output circuit, until the voltage difference value is less than the lower limit of the hysteresis voltage window, and then output a clock signal to control the working pump circuit and the output circuit; if not, output the clock signal to control the working pump circuit and the output circuit;

[0025] The frequency hopping control specifically includes: controlling the working pump circuit to be in a charging state, and controlling the output circuit to be turned off.

[0026] Optionally, after obtaining the pressure difference value, the method further includes:

[0027] When the voltage difference value is less than a preset voltage difference value, the charge pump is controlled to be turned off.

[0028] According to a second aspect of the present invention, there is provided a charge pump, comprising: an input terminal, at least two stages of cascaded pump circuits, an output circuit, and an output terminal connected in sequence; the output circuit is used to control the on-off between the pump circuit of the last stage and the output terminal;

[0029] Also includes:

[0030] A load capacitor connected between the input terminal and the output terminal;

[0031] A control circuit, used for controlling the operation of the charge pump;

[0032] The control circuit is specifically used for:

[0033] detecting an input voltage at the input terminal;

[0034] Determine whether the input voltage exceeds a preset reference value, if yes, control the charge pump to operate in a single-stage pump mode, if no, control the charge pump to operate in a multi-stage pump mode;

[0035] Wherein, in the single-stage pump mode, only one stage of the pump circuit works, and in the multi-stage pump mode, multiple stages of the pump circuit work;

[0036] During the operation of the charge pump, the working pump circuit is controlled to switch between a charging state and a discharging state; in the multi-stage pump mode, the charging state and the discharging state of the pump circuit of the last stage are opposite to those of the pump circuit of at least one remaining stage;

[0037] In the single-stage pump mode, when the working pump circuit is in a charging state, the output circuit is in an off state; when the working pump circuit is in a discharging state, the output circuit is in an on state;

[0038] In the multi-stage pump mode, when the pump circuit of the last working stage is in a charging state, the output circuit is in an off state, and when the pump circuit of the last working stage is in a discharging state, the output circuit is in an on state.

[0039] Optionally, the control circuit is further used to determine the operation mode of the charge pump according to the load requirement;

[0040] Specifically used for: when the load requirement is less than or equal to a first preset load value, determining that the operation mode of the charge pump is a single-stage pump mode;

[0041] When the load requirement is greater than the first preset load value and less than or equal to the second preset load value, determining that the operation mode of the charge pump is a single-stage multi-stage pump switching mode;

[0042] When the load requirement is greater than a third preset load value, the operation mode of the charge pump is determined to be a multi-stage pump mode.

[0043] Optionally, the control circuit is further used for:

[0044] Performing real-time detection on the voltage difference between the output terminal and the input terminal to obtain a voltage difference value;

[0045] Determine whether the voltage difference value exceeds the upper limit of the hysteresis voltage window, and if so, output a frequency hopping modulation signal to perform frequency hopping control on the working pump circuit and the output circuit, until the voltage difference value is less than the lower limit of the hysteresis voltage window, and then output a clock signal to control the working pump circuit and the output circuit; if not, output the clock signal to control the working pump circuit and the output circuit;

[0046] The frequency hopping control specifically includes: controlling the working pump circuit to be in a charging state, and controlling the output circuit to be turned off.

[0047] Optionally, the control circuit is further used for:

[0048] When the voltage difference value is less than a preset voltage difference value, the charge pump is controlled to be turned off.

[0049] Optionally, the pump circuit at each stage comprises:

[0050] A first active device, which is forward conductive and reverse cutoff; one end of which serves as an input end of the pump circuit;

[0051] A push-pull circuit, one end of which is connected to a power supply; the other end of which is grounded;

[0052] A flying capacitor, one end of which is connected to the other end of the first active device and serves as the output end of the pump circuit; and the other end of which is connected to the midpoint of the half bridge of the push-pull circuit;

[0053] The control circuit is connected to each half bridge of the push-pull circuit and is used for controlling the operation of the charge pump by controlling the push-pull circuit.

[0054] Optionally, it further comprises: a second active device, one end of which is connected to the input end, and the other end of which is connected to the output end of the pump circuit far away from the input end;

[0055] The second active device is forward conducting and reverse blocking;

[0056] The pump circuits far from the input terminal refer to pump circuits other than the pump circuit closest to the input terminal.

[0057] Optionally, the ground of the pump circuit close to the input end is a floating ground;

[0058] The pump circuit close to the input terminal refers to the pump circuit closest to the input terminal.

[0059] Optionally, the suspension ground is configured as:

[0060] When the input voltage of the input terminal is lower than a first preset value, the voltage of the floating ground is 0V;

[0061] When the input voltage of the input terminal is greater than or equal to the first preset value, the voltage of the floating ground increases linearly with the input voltage, so that the voltage difference between the input voltage and the voltage of the floating ground remains unchanged.

[0062] Optionally, the power supply of the pump circuit far away from the input end is a variable suspension power supply;

[0063] The pump circuits far from the input terminal refer to pump circuits other than the pump circuit closest to the input terminal.

[0064] Optionally, the variable suspension power supply is configured as:

[0065] When the charge pump is in a single-stage pump mode, when the input voltage of the input terminal is lower than a second preset value, the voltage of the variable floating power supply increases as the input voltage increases; when the input voltage is greater than or equal to the second preset value, the voltage of the variable floating power supply remains unchanged;

[0066] When the charge pump is in a multi-stage pump mode, when the input voltage at the input end is lower than a third preset value, the voltage of the variable floating voltage increases as the input voltage increases, wherein the third preset value is less than the second preset value; when the input voltage is greater than the third preset value and less than the second preset value, the voltage of the variable floating voltage decreases as the input voltage increases; when the input voltage is greater than or equal to the second preset value, the voltage of the variable floating voltage remains unchanged.

[0067] According to a third aspect of the present invention, there is provided an electronic device, comprising:

[0068] processor;

[0069] and, a memory for storing processor-executable instructions;

[0070] The processor implements the steps in the above method by running the executable instructions.

[0071] According to a fourth aspect of the present invention, there is provided a storage medium having a computer program stored thereon, wherein the computer program implements the steps in the above-mentioned method when executed by a processor.

[0072] The present invention provides a control method for a charge pump and a charge pump, wherein the charge pump comprises at least two cascaded pump circuits, the charge pump can operate in a single-stage pump mode or in a multi-stage pump mode; the charge pump is controlled to switch between the single-stage pump mode and the multi-stage pump mode according to the input voltage at the input end: when the input voltage is relatively low, if the single-stage pump working mode is adopted, insufficient load capacity may result, and in this case, switching to the multi-stage pump mode improves the load capacity, but the efficiency is not as good as the single-stage pump mode; when the input voltage is relatively high, the load capacity of the single-stage pump is fully utilized and the load capacity can also meet the requirements, and in this case, switching to the single-stage pump mode improves the efficiency; in summary, the charge pump is controlled to switch between the two modes according to the input voltage at the input end, so as to adapt to various power supply voltages and has high flexibility; in addition, by switching between the single-stage pump mode and the multi-stage pump mode, a trade-off between load capacity and efficiency is achieved.

[0073] In an optional scheme of the present invention, the operating mode of the charge pump can be determined according to the load requirement. When the load requirement is relatively low, it can only operate in the single-stage pump mode. When the load requirement is relatively high, it can only operate in the multi-stage pump mode. When the load requirement is between the two, it can operate in the switching mode, that is, automatically switching between the single-stage pump mode and the multi-stage pump mode.

[0074] In an optional scheme of the present invention, the voltage difference between the output end and the input end is also detected, and the charge pump is controlled according to the voltage difference: when the voltage difference does not exceed the upper limit of the hysteresis voltage window, the charge pump operates in a normal state and can be controlled by a clock signal. At this time, the working pump circuit switches alternately between the charging state and the discharging state; when the voltage difference exceeds the upper limit of the hysteresis voltage window, the charge pump is controlled to operate in a frequency hopping state and can be controlled by a frequency hopping modulation signal. At this time, the working pump circuit is controlled to be in a charging state, and the output circuit is in a shut-off state. The pump circuit no longer transfers charge to the output end until the voltage difference drops to the lower limit of the hysteresis voltage window, and then switches back to a normal state, the pump circuit transfers charge to the output end again, and the output voltage starts to rise; through the above-mentioned hysteresis frequency hopping control, the output can be stabilized at a set value, and the frequency hopping period can be automatically adjusted according to the load size. Under the same conditions, the heavier the load, the shorter the frequency hopping period, especially under light load, which reduces losses and improves efficiency.

[0075] In an optional scheme of the present invention, a second active device is also connected between the input end and the output end of the pump circuit far away from the input end. During the charging process of the pump circuit, the charge at the input end can directly charge the pump circuit through the second active device without passing through multiple first active devices, thereby reducing the forward voltage drop and improving the load capacity. In addition, when the charge pump is not working, the input end is connected to the output end through the second active device connected to the last stage pump circuit, which can ensure that the output end voltage will not be too low.

[0076] In an optional solution of the present invention, the ground of the pump circuit close to the input end is a floating ground, which can effectively control the power-on voltage of the pump circuit during the power-on process to ensure power-on safety.

[0077] In an optional solution of the present invention, the power supply of the pump circuit far away from the input end is a variable floating power supply, which automatically adjusts the internal power supply voltage, limits the energy output to the load within a cycle, and improves the output ripple. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0079] Figure 1 is a schematic diagram of a charge pump according to an embodiment of the present invention;

[0080] Figure 2 is a schematic diagram of a charge pump according to an embodiment of the present invention;

[0081] Figure 3 is a schematic diagram of a charge pump according to another embodiment of the present invention;

[0082] Figure 4 is a flow chart of a charge pump control method according to an embodiment of the present invention;

[0083] Figure 5 A flow chart of a charge pump control method according to a preferred embodiment of the present invention;

[0084] Figure 6 A flow chart of a charge pump control method according to a preferred embodiment of the present invention;

[0085] Figure 7 is a schematic diagram of a control circuit according to an embodiment of the present invention;

[0086] Figure 8 is a schematic diagram of a charge pump according to an embodiment of the present invention;

[0087] Fig. 9 is a schematic diagram of a charge pump according to a preferred embodiment of the present invention;

[0088] Fig.10 A schematic diagram of a clock signal in a single-stage mode according to an embodiment of the present invention;

[0089] Fig.11 A schematic diagram of a clock signal in a multi-stage pump mode according to an embodiment of the present invention;

[0090] Fig.12 is a schematic diagram of a charge pump according to a preferred embodiment of the present invention;

[0091] Fig.13 A schematic diagram of frequency hopping control according to a preferred embodiment of the present invention;

[0092] Fig.14 is a schematic diagram of a control circuit of a preferred embodiment of the present invention;

[0093] Fig.15 A schematic diagram showing the change of the suspended ground with the input voltage in a preferred embodiment of the present invention;

[0094] Fig.16 A schematic diagram showing the change of a variable floating power supply with input voltage according to a preferred embodiment of the present invention;

[0095] Fig.17 is a schematic diagram of an electronic device according to an embodiment of the present invention;

[0096] Description of reference numerals:

[0097] 111 - first stage pump circuit;

[0098] 112 - second stage pump circuit;

[0099] 101-a first active device,

[0100] 102-push-pull circuit;

[0101] 12- output circuit;

[0102] 13- a second active device;

[0103] 21-input voltage detection circuit;

[0104] 22-clock generating circuit;

[0105] 23-control logic module;

[0106] 24-Level conversion and anti-shoot-through circuit;

[0107] 25-voltage difference detection circuit;

[0108] 31- Processor,

[0109] 32-internal bus,

[0110] 33- Network interface,

[0111] 34-Memory,

[0112] 25-Memory. DETAILED DESCRIPTION

[0113] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0114] In the description of the specification of the present invention, it is necessary to understand that the orientation or position relationship indicated by the terms "upper part", "lower part", "upper end", "lower end", "lower surface", "upper surface", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0115] In the description of the present specification, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0116] In the description of the present invention, "plurality" means a plurality, such as two, three, four, etc., unless otherwise clearly and specifically defined.

[0117] In the description of the present invention, unless otherwise clearly specified and limited, the term "connection" and other terms should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0118] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0119] In one embodiment, a charge pump control method is provided for controlling the charge pump.

[0120] The charge pump includes: an input terminal, at least two cascaded pump circuits, an output circuit 12, and an output terminal connected in sequence; the output circuit is used to control the on-off between the last stage pump circuit and the output terminal.

[0121] Please refer to Figure 1 , taking a two-stage cascaded pump circuit: a first-stage pump circuit 111 and a second-stage pump circuit 112 as an example.

[0122] In one embodiment, the output circuit can be implemented by using a switch, please refer to Figure 2 Preferably, the switch may be a MOS tube.

[0123] In different implementations, the output circuit can also be implemented using a diode, please refer to Figure 3 .

[0124] The control method includes: controlling the charge pump to operate in a single-stage multi-stage pump switching mode.

[0125] Specifically, please refer to Figure 4 ,include:

[0126] S11: Detect the input voltage VS at the input terminal;

[0127] S12: Determine whether the input voltage VS exceeds a preset reference value. If yes, control the charge pump to operate in a single-stage pump mode. If no, control the charge pump to operate in a multi-stage pump mode.

[0128] Among them, in the single-stage pump mode, only one stage of pump circuit works, and in the multi-stage pump mode, multiple stages of pump circuits work.

[0129] Practically, the single-stage pump mode can use any pump circuit to work. Taking the above two-stage pump circuit as an example, in the single-stage pump mode, the first-stage pump circuit can be inoperative and the second-stage pump circuit can be inoperative; or the second-stage pump circuit can be inoperative and the first-stage pump circuit can be inoperative.

[0130] Although both methods listed above can be implemented, it is better to use the last stage pump circuit, that is, the first stage pump circuit does not work, and the second stage pump circuit works. Because if the first stage pump circuit is used, its output needs to pass through the device of the second stage pump circuit and then to the output end of the charge pump, and the load capacity will be lost to a certain extent. If the last stage pump circuit is used, its output goes directly to the output end of the charge pump, and the load capacity is better.

[0131] Practically, the multi-stage pump mode can work for all pump circuits or for part of the pump circuits. When the pump circuit includes two stages, both pump circuits work in the multi-stage pump mode; when the pump circuit includes more than two stages, such as three stages, in the multi-stage pump mode, both pump circuits work or all three pump circuits work.

[0132] In addition, the control method also includes:

[0133] S13: During the operation of the charge pump, the working pump circuit is controlled to switch between the charging state and the discharging state.

[0134] Specifically, in the single-stage pump mode, the working single-stage pump circuit is controlled to switch between the charging state and the discharging state. When the working pump circuit is in the charging state, the output circuit is in the off state, and the pump circuit does not transfer charge to the output end; when the working pump circuit is in the discharging state, the output circuit is in the on state, and the pump circuit transfers charge to the output end.

[0135] In the multi-stage pump mode, the working multi-stage pump circuits are controlled so that the pump circuits switch between the charging state and the discharging state. In addition, the charging state and the discharging state of the last stage pump circuit are opposite to those of the remaining at least one stage pump circuit. When the working last stage pump circuit is in the charging state, the output circuit is in the off state, and when the working last stage pump circuit is in the discharging state, the output circuit is in the on state.

[0136] In the multi-stage pump mode, taking the two-stage pump circuit given above as an example, the charging state and discharging state of the second-stage pump circuit and the first-stage pump circuit are opposite, that is: when the first-stage pump circuit is in the charging state, the second-stage pump circuit is in the discharging state, the output circuit is turned on, and the second-stage pump circuit transfers charge to the output end; when the first-stage pump circuit is in the discharging state, the second-stage pump circuit is in the charging state, the output circuit is turned off, and the first-stage pump circuit transfers charge to the second-stage pump circuit.

[0137] In the multi-stage pump mode, taking the three-stage pump circuit, all three pumps are working as an example, the charging state and discharging state of the first-stage pump circuit and the third-stage pump circuit are the same, and the charging state and discharging state of the two are opposite to the charging state and discharging state of the second-stage pump circuit. That is: when the second-stage pump circuit is in the charging state, the first-stage and third-stage pump circuits are in the discharging state, and the output circuit is turned on; when the second-stage pump circuit is in the discharging state, the first-stage and third-stage pump circuits are in the charging state, and the output circuit is turned off.

[0138] In a preferred embodiment, please refer to Figure 5 , control the charge pump to operate in single-stage multi-stage pump switching mode, and previously also include:

[0139] S21: Determine the operation mode of the charge pump according to the load requirement, and the operation mode may include: single-stage pump mode, single-stage multi-stage pump switching mode, and multi-stage pump mode.

[0140] Specifically include:

[0141] S211: When the load requirement is less than or equal to the first preset load value, determine that the operation mode of the charge pump is a single-stage pump mode, that is, the single-stage pump mode is maintained throughout the entire operation process regardless of how the input voltage changes.

[0142] S212: When the load requirement is greater than the first preset load value and less than or equal to the second preset load value, determine that the operating mode of the charge pump is a single-stage multi-stage pump switching mode, that is, switch between the single-stage pump mode and the multi-stage pump mode. How to switch is to implement the above S11~S12.

[0143] S213: When the load requirement is greater than the third preset load value, determine that the operation mode of the charge pump is the multi-stage pump mode, that is, the multi-stage pump mode is used throughout the entire operation process regardless of how the input voltage changes.

[0144] In the above embodiments, the selection of working modes is more diverse, and a suitable working mode can be selected according to the load requirements, and the trade-off between load capacity and efficiency is better.

[0145] The following is a specific example to illustrate the above S21 to S23: Take the two-stage pump circuit as an example, assuming that the single-stage pump has a load capacity of 10mA under high power and 5mA under low power, and the two-stage pump has a load capacity of 15mA under low power and 20mA under high power. If you need to carry 5mA under full power, you only need to use the single-stage pump mode; if you need to carry 8mA under full power, you can use the single-stage multi-stage pump switching mode; if you need to carry 18mA under full power, you need to use the multi-stage pump mode.

[0146] In a preferred embodiment, during the operation of the charge pump, the control method further includes: performing frequency hopping hysteresis control on the charge pump. At this time, the on-off of the output circuit needs to be controlled, so the output circuit needs to adopt a switch mode.

[0147] Specifically, please refer to Figure 6 ,include:

[0148] S31: Detect the voltage difference between the output end and the input end in real time to obtain a voltage difference value VCP-VS;

[0149] S32: Determine whether the voltage difference value exceeds the upper limit of the hysteresis voltage window. If not, it operates in a normal state, which can be achieved through a clock signal, and the working pump circuit and output circuit are controlled by the clock signal; if it exceeds, it operates in a frequency hopping state, which can be achieved through a frequency hopping modulation signal, so as to perform frequency hopping control on the working pump circuit and output circuit until the voltage difference value is less than the lower limit of the hysteresis voltage window, and then returns to a normal state, outputs a clock signal, and controls the working pump circuit and output circuit. Among them, the frequency hopping control is specifically: controlling the working pump circuit to be in a charging state, and controlling the output circuit to be turned off, that is, in the frame skipping time period, the working pump circuit no longer transfers charge to the output end, and the output voltage drops, and when it drops to a voltage difference value less than the lower limit of the hysteresis voltage window, it returns to a normal state.

[0150] In the above embodiment, frequency hopping control is performed by detecting the voltage difference between the output voltage and the input voltage, and the frequency hopping period can be automatically adjusted according to the load size. When the load is light, the output voltage increases and the voltage difference exceeds the upper limit of the hysteresis voltage window. At this time, frequency hopping control is performed and the working pump circuit no longer transfers charge to the output end, thereby reducing the loss at light load and improving efficiency.

[0151] In a preferred embodiment, after S31, the following steps are further included:

[0152] S33: When the pressure difference value is lower than the preset pressure difference value, it can be determined that the charge pump is overloaded, and the charge pump is controlled to be turned off.

[0153] In one embodiment, a charge pump is also provided. Figure 1 , which includes: an input end, at least two stages of cascaded pump circuits, an output circuit, and an output end connected in sequence; the output circuit is used to control the on-off between the pump circuit of the last stage and the output end. Further, it also includes: a load capacitor CL and a control circuit (not shown in the figure); the load capacitor CL is connected between the input end and the output end.

[0154] The control circuit is used to control the operation of the charge pump; specifically, it is used to:

[0155] Detecting the input voltage at the input terminal;

[0156] It is determined whether the input voltage exceeds a preset reference value. If yes, the charge pump is controlled to operate in a single-stage pump mode. If no, the charge pump is controlled to operate in a multi-stage pump mode. In the single-stage pump mode, only one pump circuit works, and in the multi-stage pump mode, multiple pump circuits work.

[0157] The control circuit is also used to control the working pump circuit during the operation of the charge pump, so that it switches between the charging state and the discharging state.

[0158] Specifically, in the single-stage pump mode, the working single-stage pump circuit is controlled to switch between the charging state and the discharging state, which can be achieved through a clock signal. When the working pump circuit is in the charging state, the output circuit is in the off state, and the pump circuit does not transfer charge to the output end; when the working pump circuit is in the discharging state, the output circuit is in the on state, and the pump circuit transfers charge to the output end.

[0159] In the multi-stage pump mode, the working multi-stage pump circuit is controlled so that the pump circuits are switched between the charging state and the discharging state. In addition, the charging state and the discharging state of the pump circuit of the last stage are opposite to those of the pump circuit of at least one other stage. When the pump circuit of the last stage of work is in the charging state, the output circuit is in the off state, and when the pump circuit of the last stage of work is in the discharging state, the output circuit is in the on state. Taking the two-stage pump circuit given above as an example, the charging state and the discharging state of the second-stage pump circuit and the first-stage pump circuit are opposite, that is: when the first-stage pump circuit is in the charging state, the second-stage pump circuit is in the discharging state, the output circuit is turned on, and the second-stage pump circuit transfers charge to the output end; when the first-stage pump circuit is in the discharging state, the second-stage pump circuit is in the charging state, the output circuit is turned off, and the first-stage pump circuit transfers charge to the second-stage pump circuit.

[0160] The control circuit may include: an input voltage detection circuit 21, a clock generation circuit 22, a control logic module 23, a level conversion and anti-through circuit 24, please refer to Figure 7 The input voltage detection circuit 21 is connected to the control logic module 23, and is used to detect the input voltage of the input terminal and transmit it to the control logic module 23. The clock generation circuit 22 is connected to the control logic module 23, and is used to generate a clock signal and transmit it to the control logic module 23. The control logic module 23 is used to control the output signal CLK according to the input voltage to control the operation mode of the charge pump: switching between the single-stage pump mode and the multi-stage pump mode. The control logic module 23 is connected to the level conversion and anti-through circuit 24, and the output signal of the control logic module 23 is output after passing through the level conversion and the anti-through circuit 24.

[0161] In different embodiments, the division of each unit and module is not necessarily as described above. For example, the comparison between the input voltage and the preset reference value can also be set in the input voltage detection circuit and implemented by a comparison circuit.

[0162] In one embodiment, the output circuit can be implemented using a diode, please refer to Figure 2 . In the single-stage pump mode, in the first cycle of startup, the working pump circuit is in the discharging state, the positive terminal voltage of the diode can be pumped to a voltage higher than the output terminal voltage, the diode is forward-conducted, that is, the output circuit is in the on state; when the working pump circuit is in the charging state, due to the effect of the load capacitance CL, the voltage drop at the output end is small, the reverse terminal voltage of the diode (that is, the output terminal voltage) is higher, the diode is reverse-biased and turned off, that is, the output circuit is in the off state. Similarly, in the multi-stage pump mode, when the pump circuit of the last working stage is in the charging state, the output circuit is in the off state, and when the pump circuit of the last working stage is in the discharging state, the output circuit is in the on state.

[0163] In different implementations, the output circuit can also be implemented using a switch tube, please refer to Figure 3 , its on and off can be realized by the control circuit.

[0164] In practice, each pump circuit includes: a first active device 101, a push-pull circuit 102, and a flying capacitor Cf. Figure 8 . The first active device 101 is forward-conducting and reverse-cutoff; one end of the first active device 101 serves as the input end of the pump circuit. One end of the push-pull circuit 102 is connected to the power supply, and the other end is grounded. One end of the flying capacitor 103 is connected to the other end of the first active device 101 and serves as the output end of the pump circuit; the other end of the flying capacitor 103 is connected to the midpoint (X1, X2) of the half bridge of the push-pull circuit. The push-pull circuit includes two half bridges, such as S1, S2, or S3, S4 in the figure, and the conduction and shutdown of the two half bridges are opposite, that is, in the same time period, only one half bridge is turned on and the other half bridge is turned off. The control circuit is connected to each half bridge of the push-pull circuit, and is used to control the operation of the charge pump by controlling the on and off of each half bridge of the push-pull circuit.

[0165] In one implementation, the first active device may be implemented by a diode, see Figure 2 The area occupied by the diode is relatively small, which can reduce the volume of the charge pump circuit.

[0166] In different implementations, the first active device may also be implemented using a MOS tube, but its operation requires a control signal and occupies a relatively large area.

[0167] In one implementation, the half bridge of the push-pull circuit 102 can be implemented in the form of a switch tube, such as a MOS transistor, see Fig. 9 .

[0168] The following takes the output circuit as a switch tube as an example to illustrate the clock signals in single-stage pump mode and multi-stage pump mode. The on and off of the push-pull circuit and the output circuit are realized through the clock signal.

[0169] Please refer to Fig.10 In the single-stage pump mode, take the example of the first-stage pump circuit not working and the second-stage pump circuit working. At this time, the push-pull circuit of the first-stage pump circuit is not controlled by the clock signal, and the on and off states of the half-bridge of the push-pull circuit remain unchanged. It can be S1 on and S2 off, or S1 off and S2 on. When S1 is on and S2 is off, VX1 = VS, VY1 = VS-VD1. The half-bridge S3, S4 of the push-pull circuit of the second-stage pump circuit, and the output circuit S5 are controlled by the clock signal. Fig.10 In the output circuit, the on and off of S5 are consistent with the on and off of S3. The working principle is as follows: a working cycle can be divided into two phases. When the circuit works in steady state, in the first phase P1, S4 is turned on, S3 and S5 are turned off, VS charges Cf2 through D3, D1 and D2 are bypassed, VX2 = 0, VY2 = VS-VD3, and the voltage difference across the flying capacitor Cf2 is VCf2 = VS-VD3. In the second phase P2, S3 and S5 are turned on, VX = VS2, VCf2 = VS-VD3, VY2 = VS1 + VS-VD3, and Cf2 transfers the charge stored in the P1 phase to the load capacitor CL, so when the single-stage pump is working, without considering other losses, the output voltage can reach VS1 + VS-VD3 at the highest.

[0170] Please refer to Fig.11 In the multi-stage pump mode, the working principle is: one working cycle can be divided into two phases. When the circuit works in a steady state, in the first phase P1, S2, S3, and S5 are turned on, and S1 and S4 are turned off, that is, when the pump circuit of the last stage of work is in a discharge state, the output circuit is turned on; at this time, VS charges Cf1 through D1, VCf1=VS-VD1-VGND1, VY1=VS-VD1, and at the same time VCf2 transfers its own stored charge to CL, VY2=VS1+VCf2. In the second phase P2, S1 and S4 are turned on, and S2, S3, and S5 are turned off, that is, when the pump circuit of the last stage of work is in the charging state, the output circuit is turned off; VCf1 transfers its own stored voltage to VCf2, VY1 = 2VS-VD1-VGND1, assuming VD1 = VD2 = VD3 = VD, then VY2 = 2VS-2VD-VGND1 = VCf2, so without considering other losses, the maximum voltage that VCP can reach in steady state is

[0171] VS1+VCf2=VS1+2VS-2VD-VGND1.

[0172] In the above embodiment, in the single-stage pump mode, the operation of the pump circuit of the last stage is taken as an example. In different embodiments, other pump circuits may also work, such as: the above two-stage pump circuit, the second stage pump circuit does not work, and the first stage pump circuit works; however, the output end of the first stage pump circuit to the output end VCP will pass through the first active device of the second stage pump circuit, and the forward voltage drop of an active device will be lost, and the load capacity will be slightly reduced.

[0173] In a preferred embodiment, the charge pump further comprises: a second active device 13, see Fig.12 One end of the second active device 13 is connected to the input end, and the other end is connected to the output end of the pump circuit far from the input end; the second active device is forward-conducting and reverse-cutoff. Among them, the pump circuit far from the input end refers to the pump circuit other than the pump circuit closest to the input end. Taking the above two-stage pump circuit as an example, the pump circuit far from the input end refers to the second-stage pump circuit.

[0174] Without the second active device 13, in the single-stage pump mode, when the second-stage pump circuit is working, the input voltage VS needs to pass through the first active device of the first-stage pump circuit and the first active device of the second-stage pump circuit to charge Cf2, that is, it needs to pass through two first active devices. After the second active device is set, in the single-stage pump mode, when the second-stage pump circuit is working, the input voltage VS charges Cf2 through the second active device 13, that is, it only needs to pass through one active device, which reduces the forward voltage drop and improves the load capacity.

[0175] In one implementation, the second active device 13 may be implemented by a diode, such as Fig.12 D3 implementation in .

[0176] In another implementation manner, the second active device 13 may also be implemented by a transistor.

[0177] In a preferred embodiment, the control circuit is further used to: determine the operation mode of the charge pump according to the load requirement;

[0178] Specifically used for: when the load requirement is less than or equal to the first preset load value, determining that the operation mode of the charge pump is a single-stage pump mode;

[0179] When the load requirement is greater than a first preset load value and less than or equal to a second preset load value, determining that the operation mode of the charge pump is a single-stage multi-stage pump switching mode;

[0180] When the load requirement is greater than the third preset load value, the operation mode of the charge pump is determined to be the multi-stage pump mode.

[0181] The control circuit may further include: an operation mode determination circuit connected to the control logic module, for determining the operation mode according to the load requirement and transmitting the operation mode to the control logic module. The operation mode determination module may be implemented by a comparison circuit, and its input terminal receives the load requirement value.

[0182] In a preferred embodiment, the control circuit is also used for:

[0183] The voltage difference between the output terminal and the input terminal is detected in real time to obtain the voltage difference value VCP-VS;

[0184] Determine whether the voltage difference value exceeds the upper limit of the hysteresis voltage window. If not, it runs in a normal state, which can be achieved through a clock signal, and the working pump circuit and output circuit are controlled by the clock signal; if it exceeds, it runs in a frequency hopping state, which can be achieved through a frequency hopping modulation signal PSM, so as to perform frequency hopping control on the working pump circuit and output circuit until the voltage difference value is less than the lower limit of the hysteresis voltage window, and then return to a normal state, output a clock signal CLK, and control the working pump circuit and output circuit. Among them, the frequency hopping control is specifically: control the working pump circuit to be in a charging state, and control the output circuit to be turned off, that is, during the frame skipping time period, the working pump circuit no longer transfers charge to the output end, and the output voltage drops. When it drops to a voltage difference value less than the lower limit of the hysteresis voltage window, it returns to a normal state. Please refer to Fig.13 shown.

[0185] The control circuit may further include: a voltage difference detection circuit 25, see Fig.14 The pressure difference detection circuit 25 is connected to the control logic module 23, and is used to detect the pressure difference between the output end and the input end, and determine the pressure difference value to output a skip signal to the control logic module 23. If the pressure difference value exceeds the upper limit of the hysteresis voltage window, the skip signal can be high, and if it does not exceed, the skip signal can be low. The control logic module 23 is also used to determine whether it is necessary to operate in a frequency hopping state according to the skip signal; specifically, when the pressure difference value exceeds the upper limit of the hysteresis voltage window, a frequency hopping modulation signal PSM is output to perform frequency hopping control on the working pump circuit and the output circuit.

[0186] In a preferred embodiment, the voltage difference detection voltage 25 is also used to determine whether the voltage difference value is lower than the preset voltage difference value. If it is, it can be determined that the charge pump is overloaded, and the cpuv signal is output to the control logic module. Please refer to Fig.13 After receiving the cpuv signal, the control logic module controls the output signal to control the charge pump to shut down.

[0187] In a preferred embodiment, the ground of the pump circuit close to the input end is a floating ground; the pump circuit close to the input end refers to the pump circuit closest to the input end. For example, taking the above two-stage pump circuit as an example, the ground VGND1 of the first-stage pump circuit is a floating ground.

[0188] It should be understood that the “close to the input end” refers to closeness in connection relationship, and does not necessarily mean closeness in setting position.

[0189] In practice, the floating ground is set to: when the input voltage at the input end is lower than the first preset value V VS-VGND When the voltage of the floating ground is 0V; when the input voltage of the input terminal is greater than or equal to the first preset value V VS-VGND When the voltage of the floating ground increases linearly with the input voltage, the voltage difference between the input voltage VS and the floating ground VGND1 no longer changes. Please refer to Fig.15 .

[0190] If the ground of the pump circuit connected to the input terminal is set to a fixed ground, such as 0V, then when powered on, if VS is too large, the instantaneous current at power-on will be relatively large, and the circuit will be easily damaged; in addition, when the load current is relatively small, the energy at the moment of power-on is relatively large, and the energy stored in one cycle has exceeded the charge required by the load, so that the control circuit has no time to react and the voltage has already rushed up, resulting in a relatively large output ripple. If the ground is set to a floating ground, it will change with the value of the input voltage, so that the instantaneous current at power-on will not be too large, protecting the safety of power-on; and the energy at the moment of power-on can be used, and the output voltage can rise steadily, and will not rush directly to the required voltage, which can reduce the output ripple.

[0191] In a preferred embodiment, the power supply of the pump circuit far from the input end is a variable floating power supply; the pump circuit far from the input end refers to the pump circuit other than the pump circuit closest to the input end. For example, taking the above two-stage pump circuit as an example, the power supply VS1 of the second-stage pump circuit is a variable floating power supply.

[0192] In practice, the variable floating power supply is set to: when the charge pump is in a single-stage pump mode, the input voltage at the input end is lower than the second preset value VS1_max, VS1=VS, that is, the voltage of the variable floating power supply increases with the increase of the input voltage; after the input voltage is greater than or equal to the second preset value VS1_max, the voltage of the variable floating power supply remains unchanged and no longer changes with VS. When the charge pump is in a multi-stage pump mode, when the input voltage at the input end is lower than the third preset value VS1_max_dual, the voltage of the variable floating voltage increases with the increase of the input voltage, and the sum of VCf1 and VCf2 also gradually increases, and VCf1+VCf2 reaches the set maximum value, wherein the third preset value is less than the second preset value; when the input voltage is greater than the third preset value VS1_max_dual and less than the second preset value VS1_max, the voltage of the variable floating voltage decreases with the increase of the input voltage, so that VCf1+VCf2 can be maintained at the maximum value unchanged; when the input voltage is greater than or equal to the second preset value VS1_max, the voltage of the variable floating power supply remains unchanged and no longer changes with VS, please refer to Fig.16 .

[0193] Preferably, the second preset value VS1_max is equal to the first preset value V VS-VGND The values ​​of are approximately equal, that is, when the flying capacitor voltage of the first-stage pump circuit no longer changes, the flying capacitor voltage of the second-stage pump circuit does not need to change.

[0194] In one embodiment, an electronic device is also provided, please refer to Fig.17 . At the hardware level, the device includes a processor 31, an internal bus 32, a network interface 33, a memory 34 and a storage 35, and of course may also include hardware required for other services. One or more embodiments of the present invention can be implemented based on software, such as the processor 31 reading the corresponding computer program from the storage 35 into the memory 34 and then running it. Of course, in addition to the software implementation, one or more embodiments of the present invention do not exclude other implementation methods, such as logic devices or a combination of software and hardware, etc., that is, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic devices.

[0195] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer, which may be in the form of a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email transceiver, a game console, a tablet computer, a wearable device or a combination of any of these devices.

[0196] In a typical configuration, a computer includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0197] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0198] Computer-readable media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, disk storage, quantum memory, graphene-based storage media or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0199] The above describes specific embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0200] In the description of this specification, the description with reference to the terms "an implementation", "an example", "a specific implementation process", "an example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0201] It should be understood that although the terms first, second, third, etc. may be used to describe various information in one or more embodiments of the present invention, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0202] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A charge pump control method, characterized in that: Used to control the charge pump; The charge pump comprises: an input end, at least two stages of cascaded pump circuits, an output circuit, and an output end connected in sequence; The output circuit is used to control the on-off between the pump circuit of the last stage and the output end; The control method comprises: controlling the charge pump to operate in a single-stage or multi-stage pump switching mode; Specifically, it includes: detecting an input voltage at the input terminal; It is determined whether the input voltage exceeds a preset reference value. If yes, the charge pump is controlled to operate in a single-stage pump mode. If no, the charge pump is controlled to operate in a multi-stage pump mode. Wherein, in the single-stage pump mode, only one stage of the pump circuit works, and in the multi-stage pump mode, multiple stages of the pump circuit work; During the operation of the charge pump, the working pump circuit is controlled to switch between a charging state and a discharging state; in the multi-stage pump mode, the charging state and the discharging state of the pump circuit of the last stage are opposite to those of the pump circuit of at least one remaining stage; In the single-stage pump mode, when the working pump circuit is in a charging state, the output circuit is in an off state; when the working pump circuit is in a discharging state, the output circuit is in an on state; In the multi-stage pump mode, when the pump circuit of the last working stage is in a charging state, the output circuit is in an off state, and when the pump circuit of the last working stage is in a discharging state, the output circuit is in an on state.

2. The control method according to claim 1, characterized in that: The controlling the charge pump to operate in a single-stage or multi-stage pump switching mode also includes: Determining the operating mode of the charge pump according to the load requirement; Specifically include: When the load requirement is less than or equal to a first preset load value, determining that the operation mode of the charge pump is a single-stage pump mode; When the load requirement is greater than the first preset load value and less than or equal to the second preset load value, determining that the operation mode of the charge pump is a single-stage multi-stage pump switching mode; When the load requirement is greater than a third preset load value, the operation mode of the charge pump is determined to be a multi-stage pump mode.

3. The control method according to claim 1 or 2, characterized in that: Also includes: Performing real-time detection on the voltage difference between the output terminal and the input terminal to obtain a voltage difference value; Determine whether the voltage difference value exceeds the upper limit of the hysteresis voltage window, and if so, output a frequency hopping modulation signal to perform frequency hopping control on the working pump circuit and the output circuit, until the voltage difference value is less than the lower limit of the hysteresis voltage window, and then output a clock signal to control the working pump circuit and the output circuit; if not, output the clock signal to control the working pump circuit and the output circuit; The frequency hopping control specifically includes: controlling the working pump circuit to be in a charging state, and controlling the output circuit to be turned off.

4. The control method according to claim 3, characterized in that: After obtaining the pressure difference value, the method further includes: When the voltage difference value is less than a preset voltage difference value, the charge pump is controlled to be turned off.

5. A charge pump, characterized in that: It includes: an input end, at least two stages of cascaded pump circuits, an output circuit, and an output end connected in sequence; The output circuit is used to control the on-off between the pump circuit of the last stage and the output end; Also includes: A load capacitor connected between the input terminal and the output terminal; A control circuit, used for controlling the operation of the charge pump; The control circuit is specifically used for: detecting an input voltage at the input terminal; Determine whether the input voltage exceeds a preset reference value, if yes, control the charge pump to operate in a single-stage pump mode, if no, control the charge pump to operate in a multi-stage pump mode; Wherein, in the single-stage pump mode, only one stage of the pump circuit works, and in the multi-stage pump mode, multiple stages of the pump circuit work; During the operation of the charge pump, the working pump circuit is controlled to switch between a charging state and a discharging state; in the multi-stage pump mode, the charging state and the discharging state of the pump circuit of the last stage are opposite to those of the pump circuit of at least one remaining stage; In the single-stage pump mode, when the working pump circuit is in a charging state, the output circuit is in an off state; when the working pump circuit is in a discharging state, the output circuit is in an on state; In the multi-stage pump mode, when the pump circuit of the last working stage is in a charging state, the output circuit is in an off state, and when the pump circuit of the last working stage is in a discharging state, the output circuit is in an on state.

6. The charge pump according to claim 5, characterized in that The control circuit is also used to determine the operation mode of the charge pump according to the load requirement; Specifically used for: when the load requirement is less than or equal to a first preset load value, determining that the operation mode of the charge pump is a single-stage pump mode; When the load requirement is greater than the first preset load value and less than or equal to the second preset load value, determining that the operation mode of the charge pump is a single-stage multi-stage pump switching mode; When the load requirement is greater than a third preset load value, the operation mode of the charge pump is determined to be a multi-stage pump mode.

7. The charge pump according to claim 5, characterized in that The control circuit is also used for: Performing real-time detection on the voltage difference between the output terminal and the input terminal to obtain a voltage difference value; Determine whether the voltage difference value exceeds the upper limit of the hysteresis voltage window, and if so, output a frequency hopping modulation signal to perform frequency hopping control on the working pump circuit and the output circuit, until the voltage difference value is less than the lower limit of the hysteresis voltage window, and then output a clock signal to control the working pump circuit and the output circuit; if not, output the clock signal to control the working pump circuit and the output circuit; The frequency hopping control specifically includes: controlling the working pump circuit to be in a charging state, and controlling the output circuit to be turned off.

8. The charge pump according to claim 7, characterized in that The control circuit is also used for: When the voltage difference value is lower than a preset voltage difference value, the charge pump is controlled to be turned off.

9. The charge pump according to claim 5, characterized in that Each stage of the pump circuit comprises: A first active device, which is forward conductive and reverse cutoff; one end of which serves as an input end of the pump circuit; A push-pull circuit, one end of which is connected to a power supply; the other end of which is grounded; A flying capacitor, one end of which is connected to the other end of the first active device and serves as the output end of the pump circuit; and the other end of which is connected to the midpoint of the half bridge of the push-pull circuit; The control circuit is connected to each half bridge of the push-pull circuit and is used for controlling the operation of the charge pump by controlling the push-pull circuit.

10. The charge pump according to claim 9, characterized in that Also includes: a second active device, one end of which is connected to the input end, and the other end of which is connected to the output end of the pump circuit far away from the input end; The second active device is forward conducting and reverse blocking; The pump circuits far from the input terminal refer to pump circuits other than the pump circuit closest to the input terminal.

11. The charge pump according to any one of claims 5 to 10, characterized in that: The ground of the pump circuit close to the input terminal is a floating ground; The pump circuit close to the input terminal refers to the pump circuit closest to the input terminal.

12. The charge pump according to claim 11, characterized in that The suspension ground is set to: When the input voltage of the input terminal is lower than a first preset value, the voltage of the floating ground is 0V; When the input voltage of the input terminal is greater than or equal to the first preset value, the voltage of the floating ground increases linearly with the input voltage, so that the voltage difference between the input voltage and the voltage of the floating ground remains unchanged.

13. The charge pump according to any one of claims 5 to 10, characterized in that: The power supply of the pump circuit far away from the input end is a variable suspension power supply; The pump circuits far from the input terminal refer to pump circuits other than the pump circuit closest to the input terminal.

14. The charge pump according to claim 13, characterized in that The variable suspension power supply is configured as follows: When the charge pump is in a single-stage pump mode, when the input voltage of the input terminal is lower than a second preset value, the voltage of the variable floating power supply increases as the input voltage increases; when the input voltage is greater than or equal to the second preset value, the voltage of the variable floating power supply remains unchanged; When the charge pump is in a multi-stage pump mode, when the input voltage at the input end is lower than a third preset value, the voltage of the variable floating voltage increases as the input voltage increases, wherein the third preset value is smaller than the second preset value; when the input voltage is greater than the third preset value and less than the second preset value, the voltage of the variable floating voltage decreases as the input voltage increases; When the input voltage is greater than or equal to the second preset value, the voltage of the variable floating power supply remains unchanged.

15. An electronic device, characterized in that: include: processor; and, a memory for storing processor-executable instructions; The processor implements the steps in the method of any one of claims 1 to 4 by running the executable instructions.

16. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the steps in the method according to any one of claims 1 to 4 are implemented.

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