Charge pump circuit and chip

Abstract

The invention discloses a charge pump circuit and a chip, relates to the field of integrated circuit design, and solves the problems that a traditional charge pump circuit is complex in control, low in fixed flexibility of a control time sequence, large in output ripple and low in efficiency. The charge pump circuit comprises: a voltage output terminal for providing an output voltage; the charge pump module comprises N basic units, each basic unit comprises an energy storage unit, N is a positive integer, the N basic units are connected in series and in parallel, one ends of the N basic units are connected to power supply voltage, the other ends of the N basic units are grounded, and each basic unit is connected with the voltage output end; and the control module is respectively connected with each basic unit and the voltage output end, and is used for detecting the magnitude of the output voltage and controlling charging and discharging of the N basic units according to a comparison result of the output voltage and a preset voltage so as to provide load current for a load.

Description

Technical Field

[0001] The present invention relates to the field of integrated circuit design, and in particular to a charge pump circuit and a chip. Background Art

[0002] Charge pump circuits are increasingly used in power supply strategies for electronic devices due to their high integration. Traditional charge pump circuits used in high-voltage circuits have problems such as complex control, low flexibility in fixed control timing, large output ripple, and low efficiency. Summary of the invention

[0003] The present invention provides a charge pump circuit and a chip, which solve the problems of complex control, low flexibility in fixed control timing, large output ripple and low efficiency existing in traditional charge pump circuits.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme: In a first aspect, the present invention provides a charge pump circuit, which may include: A voltage output terminal, used for providing an output voltage; A charge pump module, the charge pump module includes N basic units, each basic unit includes an energy storage unit, N is a positive integer, the N basic units are connected in series and parallel, one end of the N basic units is connected to the power supply voltage, the other end is grounded, and each basic unit is connected to the voltage output end respectively; The control module is connected to each basic unit and the voltage output terminal respectively, and is used to detect the magnitude of the output voltage, and control the charging and discharging of the N basic units according to the comparison result between the output voltage and the preset voltage to provide load current to the load.

[0005] In a possible implementation, the charge pump circuit further includes: a first switch; The first switch is arranged between the power supply voltage and the highest level basic unit, and the first switch is connected to the control module; the highest level basic unit is the basic unit which is closest to the power supply voltage during charging; A control module, used to control the first switch to be turned on to charge the energy storage units in the N basic units, and after charging for a preset time period, control the energy storage units in the N basic units to discharge step by step; The control module is also used to control the charging and discharging of the N basic units in real time according to the comparison result between the output voltage and the preset voltage during the charging and discharging process of the energy storage unit.

[0006] In a possible implementation, the control module is specifically configured to control the energy storage units in the N basic units to discharge step by step, starting from the lowest level basic unit, after charging for a preset time period; The lowest level basic unit is the basic unit that is farthest connected to the power supply voltage during charging among the N basic units.

[0007] In a possible implementation, the control module is further configured to control the first switch to turn off after a preset charging time period; or, The control module is also used to control the first switch to turn off and enter the next charge and discharge cycle after the discharge cycle of any energy storage unit ends.

[0008] In a possible implementation, the basic unit further includes: a second switch, a third switch, and a fourth switch; One end of the energy storage unit is connected to the voltage output end through the second switch, the other end of the energy storage unit is grounded through the third switch, and the other end of the energy storage unit is also connected to one end of the fourth switch; The second switch and the third switch are also connected to the control module; If the basic unit is the highest level basic unit, one end of the energy storage unit is also connected to the first switch; if the basic unit is not the highest level basic unit, one end of the energy storage unit is also connected to the other end of the fourth switch in the previous level basic unit; If the basic unit is a basic unit of the lowest level, the other end of the fourth switch is connected to the voltage output end; if the basic unit is not a basic unit of the lowest level, the other end of the fourth switch is connected to one end of the energy storage unit in the basic unit of the next level; The control module is specifically used to control the second switch and the third switch in the basic unit to be turned on one by one after charging for a preset time period, so as to discharge the energy storage unit in the basic unit.

[0009] In a possible implementation, the control module is specifically configured to: When the output voltage is greater than the preset voltage, if the current state is the discharge state of the energy storage unit of the target basic unit, the second switch and the third switch of the target basic unit are controlled to remain turned on so that the energy storage unit of the target basic unit remains discharged, until the output voltage is less than the preset voltage, the second switch and the third switch of the next-level basic unit of the target basic unit are controlled to be turned on so that the energy storage unit of the next-level basic unit is discharged; If the current state is the charging state of the energy storage unit, the first switch is controlled to remain turned on to maintain the charging state until the output voltage is less than the preset voltage, and the energy storage units in the N basic units are controlled to discharge step by step; When the output voltage is lower than the preset voltage, the current state remains unchanged.

[0010] In a possible implementation, the control module is further configured to control the second switch and the third switch of the target basic unit to be turned off when the second switch and the third switch of the next-stage basic unit of the target basic unit are turned on, so that the energy storage unit of the next-stage basic unit is discharged, and the energy storage unit of the target basic unit stops discharging; or, The control module is also used to control all the second switches and the third switches of the N basic units to turn off after a charge and discharge cycle ends, and enter the next charge and discharge cycle.

[0011] In a possible implementation, the control module is specifically used to control the second switch and the third switch in the basic unit to be turned on at the same time, so as to discharge the energy storage unit in the basic unit; or, The control module is specifically used to first control the second switch in the basic unit to be turned on for a set time period, and then control the third switch in the basic unit to be turned on, so as to discharge the energy storage unit in the basic unit.

[0012] In a possible implementation, the fourth switch is a diode or a MOS tube; If the fourth switch is a MOS tube, the fourth switch is also connected to the control module; the control module is used to control the first switch and the fourth switch to be turned on, and the second switch and the third switch to be turned off, so as to charge the energy storage unit in the N basic units, and is also used to control the second switch and the third switch to be turned on, and the fourth switch to be turned off, so as to discharge the energy storage unit.

[0013] In a possible implementation, the on-times of switches in different basic units are the same or different; The switch is a first switch, a second switch or a third switch.

[0014] In a possible implementation, the control module includes: an output voltage detection module, an oscillation module and a logic module; One end of the output voltage detection module is connected to the voltage output end, and the other end is connected to the oscillation module; The other end of the oscillation module is connected to one end of the logic module; The other end of the logic module is connected to N basic units.

[0015] In a second aspect, the present invention provides a control method for a charge pump circuit. The control method can be applied to the charge pump circuit of the first aspect and any possible implementation thereof. The control method may include: A voltage output terminal, used for providing an output voltage; A charge pump module, the charge pump module includes N basic units, each basic unit includes an energy storage unit, N is a positive integer, the N basic units are connected in series and parallel, one end of the N basic units is connected to the power supply voltage, the other end is grounded, and each basic unit is connected to the voltage output end respectively; The control module is connected to each basic unit and the voltage output terminal respectively, detects the magnitude of the output voltage, and controls the charging and discharging of the N basic units according to the comparison result between the output voltage and the preset voltage to provide load current to the load.

[0016] In a third aspect, the present invention provides a chip, which may include the charge pump circuit of the first aspect and any possible implementation thereof.

[0017] The charge pump circuit provided by the present invention has a control module that can detect the magnitude of the output voltage in real time, compare the magnitude of the output voltage with the magnitude of the preset voltage, and control the charging and discharging process of N basic units according to the comparison result to supply power to the subsequent circuit. By controlling the charging and discharging state of the N basic units by detecting the output voltage in real time, the output voltage of the charge pump circuit can be stabilized near the set value, and the control process is simple, the control timing is more flexible, the output ripple is smaller, and the efficiency of the charge pump circuit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A circuit principle block diagram of a charge pump circuit provided by an embodiment of the present invention; Figure 2 A circuit schematic diagram of a charge pump circuit provided by an embodiment of the present invention; Figure 3 A circuit schematic diagram of a basic unit provided by an embodiment of the present invention; Figure 4 A control timing diagram of a charge pump circuit provided by an embodiment of the present invention; Figure 5 A circuit schematic diagram of another charge pump circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] 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.

[0020] In the following, 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 technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "multiple" means two or more. In addition, the use of "based on" or "according to" means openness and inclusiveness, because the process, steps, calculations or other actions "based on" or "according to" one or more of the conditions or values ​​may be based on additional conditions or values ​​beyond the described values ​​in practice.

[0021] Figure 1 The circuit principle block diagram of a charge pump circuit provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the charge pump circuit may include: a voltage output terminal 11 , a charge pump module 12 and a control module 13 .

[0022] The voltage output terminal 11 is used to provide an output voltage VO.

[0023] The charge pump module 12 includes N basic units, each of which includes an energy storage unit, N is a positive integer, the N basic units are connected in series and parallel, one end of the N basic units is connected to the power supply voltage, the other end is grounded, and each basic unit is respectively connected to the voltage output terminal 11. In a specific implementation, the energy storage unit can be a capacitor, or other implementations, which are not limited here.

[0024] The control module 13 is connected to each basic unit and the voltage output terminal 11 respectively, and is used to detect the magnitude of the output voltage, and control the charging and discharging of the N basic units according to the comparison result between the output voltage and the preset voltage to provide load current to the load.

[0025] The charge pump circuit provided by the present invention has a control module that can detect the magnitude of the output voltage in real time, compare the magnitude of the output voltage with the magnitude of the preset voltage, and control the charging and discharging process of N basic units according to the comparison result to supply power to the subsequent circuit. By controlling the charging and discharging state of the N basic units by detecting the output voltage in real time, the output voltage of the charge pump circuit can be stabilized near the set value, and the control process is simple, the control timing is more flexible, the output ripple is smaller, and the efficiency of the charge pump circuit is improved.

[0026] Optionally, in the embodiment of the present invention, refer to Figure 1 , Figure 2 A circuit schematic diagram of a charge pump circuit provided by an embodiment of the present invention. Figure 2 As shown, the charge pump circuit may further include: a first switch 14 .

[0027] The first switch 14 is arranged between the power supply voltage and the highest level basic unit, and the first switch 14 is connected to the control module 13; the highest level basic unit is the basic unit that is closest to the power supply voltage during charging.

[0028] The control module 13 is used to control the first switch 14 to be turned on to charge the energy storage units in the N basic units, and after charging for a preset time period, control the energy storage units in the N basic units to discharge step by step.

[0029] The control module 13 is also used to control the charging and discharging of the N basic units in real time according to the comparison result between the output voltage and the preset voltage during the charging and discharging process of the energy storage unit.

[0030] It should be noted that, in actual applications, the control module 13 controls the on and off of the first switch 14 through a driving circuit, and the driving circuit can be a high-voltage driving circuit or a low-voltage driving circuit. Moreover, the first switch can be a MOS tube, a triode, or other devices that can realize a switch function, which is not limited here. Figure 2 In the figure, the first switch K1 is shown as a simple switch.

[0031] In the embodiment of the present invention, the control module controls the N energy storage units to charge first, and then controls the N energy storage units to discharge step by step, so as to monitor the relationship between the output voltage and the preset voltage in real time, thereby controlling the charging and discharging state and reducing the output ripple.

[0032] Optionally, in an embodiment of the present invention, the control module is specifically used to control the energy storage units in N basic units to discharge step by step, starting from the lowest level basic unit, after charging for a preset time period.

[0033] The lowest level basic unit is the basic unit that is farthest connected to the power supply voltage during charging among the N basic units.

[0034] Thus, during the discharge process of the energy storage unit, the discharge starts from the lowest level energy storage unit, that is, the discharge starts from the energy storage unit closest to the ground, and only one energy storage unit is discharged at a time. Compared with discharging all energy storage units at the same time, the output ripple can be reduced.

[0035] Optionally, in an embodiment of the present invention, the control module is further configured to control the first switch to turn off after a preset charging time period.

[0036] or, The control module is also used to control the first switch to turn off after the discharge cycle of any energy storage unit ends.

[0037] That is to say, in the embodiment of the present invention, the control timing of the first switch is highly flexible, and it can be controlled to be turned off after the charging cycle ends, or it can be controlled to be turned off after the discharge cycle of any energy storage unit ends.

[0038] Optionally, in the embodiment of the present invention, the basic unit may include, in addition to the energy storage unit, a second switch, a third switch and a fourth switch.

[0039] One end of the energy storage unit is connected to the voltage output end through the second switch, the other end of the energy storage unit is grounded through the third switch, and the other end of the energy storage unit is also connected to one end of the fourth switch.

[0040] The second switch and the third switch are also connected to the control module.

[0041] If the basic unit is the highest level basic unit, one end of the energy storage unit is also connected to the first switch; if the basic unit is not the highest level basic unit, one end of the energy storage unit is also connected to the other end of the fourth switch in the previous level basic unit.

[0042] If the basic unit is the lowest level basic unit, the other end of the fourth switch is connected to the voltage output end; if the basic unit is not the lowest level basic unit, the other end of the fourth switch is connected to one end of the energy storage unit in the next level basic unit.

[0043] The control module is specifically used to control the second switch and the third switch in the basic unit to be turned on one by one after charging for a preset time period, so as to discharge the energy storage unit in the basic unit.

[0044] Optionally, in an embodiment of the present invention, the control module is specifically used to: When the output voltage is greater than the preset voltage, if the current state is the discharge state of the energy storage unit of the target basic unit, the second switch and the third switch of the target basic unit are controlled to remain turned on so that the energy storage unit of the target basic unit remains discharged, until the output voltage is less than the preset voltage, the second switch and the third switch of the next-level basic unit of the target basic unit are controlled to be turned on so that the energy storage unit of the next-level basic unit is discharged.

[0045] If the current state is the charging state of the energy storage unit, the first switch is controlled to remain turned on to maintain the charging state until the output voltage is less than the preset voltage, and the energy storage units in the N basic units are controlled to discharge step by step.

[0046] When the output voltage is lower than the preset voltage, the current state remains unchanged.

[0047] Optionally, in the embodiment of the present invention, the second switch and the third switch may be MOS tubes or triodes, or other switching devices, which are not limited here.

[0048] Optionally, in the embodiment of the present invention, the fourth switch may be a diode or a MOS tube.

[0049] If the fourth switch is a MOS tube, the fourth switch is also connected to the control module. The control module is used to control the first switch and the fourth switch to be turned on, and the second switch and the third switch to be turned off, so as to charge the energy storage unit in the N basic units, and is also used to control the second switch and the third switch to be turned on, and the fourth switch to be turned off, so as to discharge the energy storage unit.

[0050] Compared with the fourth switch being a MOS tube, the fourth switch being a diode does not require an intermediate level for control, which can simplify the operation sequence, making the control of the charge pump circuit simpler and improving the efficiency of the charge pump.

[0051] It is worth noting that in the embodiment of the present invention, if the fourth switch is a MOS tube, then the control module controls the second switch, the third switch, and the fourth switch through a drive circuit. For example, in a scenario where the power supply voltage is high voltage, the drive circuit for controlling the first switch is implemented at high voltage, and the drive circuits for controlling the second switch, the third switch, and the fourth switch are all implemented at low voltage. Specifically, the control can be achieved by using the on-chip low-voltage logic to drive the high-voltage switch.

[0052] Optionally, in an embodiment of the present invention, the turn-off control of the second switch and the third switch is flexible and diverse.

[0053] The control module is further used to control the second switch and the third switch of the target basic unit to be turned off when the second switch and the third switch of the next-level basic unit of the target basic unit are turned on, so that the energy storage unit of the next-level basic unit is discharged, and the energy storage unit of the target basic unit ends discharging. The target basic unit is any basic unit of the N basic units except the basic unit of the lowest level.

[0054] or, The control module is also used to control all the second switches and the third switches of the N basic units to turn off after a charge and discharge cycle ends, and enter the next charge and discharge cycle.

[0055] Optionally, in an embodiment of the present invention, the control module is specifically used to control the second switch and the third switch in the basic unit to be turned on at the same time, so as to discharge the energy storage unit in the basic unit.

[0056] or, The control module is specifically used to first control the second switch in the basic unit to be turned on for a set time period, and then control the third switch in the basic unit to be turned on, so as to discharge the energy storage unit in the basic unit.

[0057] In the second implementation method mentioned above, when discharging the energy storage unit in the basic unit, the second switch is controlled to be turned on first, and then the third switch is controlled to be turned on after a set time period. In this way, the parasitic capacitance of the energy storage unit, i.e., the lower plate of the capacitor, and the parasitic capacitance of the second switch can be sent to the voltage output end instead of being completely consumed, thereby improving the efficiency of the charge pump and reducing the ripple of the output voltage.

[0058] Optionally, in an embodiment of the present invention, the charge pump circuit may further include a capacitor, which is arranged between the lowest level basic unit and ground, and serves as an output capacitor for stabilizing the output voltage.

[0059] Optionally, in an embodiment of the present invention, the on-times of switches in different basic units may be the same or different. The switch may be a first switch, a second switch or a third switch. That is, during the charging and discharging process, the on-times of the first switch, the second switch or the third switch may be completely the same or different, which can improve the flexibility of the control timing.

[0060] For example, Figure 3 A circuit schematic diagram of a basic unit provided by an embodiment of the present invention. Figure 3 As shown, Figure 3 In the example, the charge pump module 12 includes two basic units, namely basic unit 1 and basic unit 2. The second switch in basic unit 1 is K2, the third switch is K3, and the fourth switch is D1. The second switch in basic unit 2 is K4, the third switch is K5, and the fourth switch is D2. Of the two basic units, basic unit 1 is the highest level basic unit, and basic unit 2 is the lowest level basic unit. And Figure 3 In the example, the fourth switch is a diode and the energy storage unit is a capacitor. The energy storage unit included in the basic unit 1 is C1 and the fourth switch is D1. The energy storage unit included in the basic unit 2 is C2 and the fourth switch is D2.

[0061] The charge pump circuit may further include a capacitor C3, wherein an upper plate of C3 is connected to the basic unit of the lowest level, and a lower plate of C3 is grounded.

[0062] Figure 3 In the example, the control signal of the second switch K4 of the basic unit 2 is φ2a, and the control signal of the third switch K5 is φ2b. The control signal of the second switch K2 of the basic unit 1 is φ3a, and the control signal of the third switch K3 is φ3b. The control signal of the first switch is φ1.

[0063] Figure 3 The signal of the comparison result between the output voltage and the preset voltage is vo_ok. When vo_ok is high, it indicates that the output voltage is higher than the preset voltage. When vo_ok is low, it indicates that the output voltage is lower than the preset voltage.

[0064] Figure 3 In the example, it is assumed that the first switch is turned off after the charging cycle ends. The second switch and the third switch in the two basic units are turned off after the discharge cycle of the basic unit 1 ends, that is, they are turned off after a charge and discharge cycle ends. Then, the control module controls the first switch K1 to turn on, and controls K2, K3, K4, and K5 to turn off, so that C1, C2, and C3 are charged. Assuming that during the charging cycle, the output voltage is always lower than the preset voltage, then after the charging cycle ends, the control module controls the first switch K1 to turn off, and controls the second switch K4 and the third switch K5 in the basic unit 2 to turn on, so that C2 discharges. Assuming that during the discharge cycle of C2, the control module detects that the output voltage is greater than the preset voltage, that is, vo_ok changes from low to high, at this time, K4 and K5 continue to be controlled to remain turned on, so that the energy storage unit in the basic unit 2 is completely discharged, until the output voltage is less than the preset voltage, that is, when vo_ok changes from high to low, the control module controls the second switch K2 and the third switch K3 in the basic unit 1 to turn on, so that C1 discharges. Assuming that during the discharge process of C1, the control module detects that the output voltage is greater than the preset voltage again, that is, vo_ok changes from low to high again, the control module continues to control K2 and K3 to remain on until the output voltage is less than the preset voltage, controls K2, K3, K4, and K5 to turn off, ends the discharge cycle, and controls K1 to turn on, enters the next charge and discharge cycle, and repeats the cycle. And assume that the voltage of the upper plate of C1 is vc1t, and the voltage of the lower plate is vc1b. The voltage of the upper plate of C2 is vc2t, and the voltage of the lower plate is vc2b. Figure 4 As shown, it is the control timing diagram of the corresponding charge pump circuit.

[0065] Optionally, in the embodiment of the present invention, refer to Figure 1 , Figure 5 FIG. 1 is a circuit schematic diagram of another charge pump circuit provided by an embodiment of the present invention. Figure 5 As shown, the control module 13 may include: an output voltage detection module 131 , an oscillation module 132 and a logic module 133 .

[0066] Among them, one end of the output voltage detection module is connected to the voltage output end, and the other end is connected to one end of the oscillation module.

[0067] The other end of the oscillation module is connected to one end of the logic module.

[0068] The other end of the logic module is connected to the charge pump module 12 .

[0069] The embodiment of the present invention also provides a control method for a charge pump circuit, which can be applied to the above Figure 1-Figure 5 Any charge pump circuit in. The control method may include: The voltage output terminal is used to provide output voltage.

[0070] The charge pump module includes N basic units, each basic unit includes an energy storage unit, N is a positive integer, the N basic units are connected in series and parallel, one end of the N basic units is connected to the power supply voltage, the other end is grounded, and each basic unit is respectively connected to the voltage output end.

[0071] The control module is connected to each basic unit and the voltage output terminal respectively, detects the magnitude of the output voltage, and controls the charging and discharging of the N basic units according to the comparison result between the output voltage and the preset voltage to provide load current to the load.

[0072] The control method of the charge pump circuit provided by the present invention is that the control module can detect the magnitude of the output voltage in real time, compare the magnitude of the output voltage with the magnitude of the preset voltage, and control the charging and discharging process of N basic units according to the comparison result to supply power to the subsequent circuit. By controlling the charging and discharging state of the N basic units by real-time detection of the output voltage, the output voltage of the charge pump circuit can be stabilized near the set value, and the control process is simple, the control timing is more flexible, the output ripple is smaller, and the efficiency of the charge pump circuit is improved.

[0073] The embodiment of the present invention further provides a chip, which may include Figure 1-Figure 5 Any charge pump circuit in .

[0074] In a possible implementation, the chip may be a power management chip, and of course, may also be other types of chips including a charge pump circuit, which is not specifically limited here.

[0075] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A charge pump circuit, characterized in that: include: A voltage output terminal, used for providing an output voltage; A charge pump module, wherein the charge pump module comprises N basic units, each basic unit comprises an energy storage unit, N is a positive integer, the N basic units are connected in series and parallel, one end of the N basic units is connected to a power supply voltage, the other end is grounded, and each basic unit is respectively connected to the voltage output end; The control module is connected to each basic unit and the voltage output terminal respectively, and is used to detect the magnitude of the output voltage, and control the charging and discharging of the N basic units according to the comparison result between the output voltage and the preset voltage to provide load current to the load.

2. The charge pump circuit according to claim 1, characterized in that: The charge pump circuit further includes: a first switch; The first switch is arranged between the power supply voltage and the highest level basic unit, and the first switch is connected to the control module; the highest level basic unit is the basic unit that is closest to the power supply voltage during charging; The control module is used to control the first switch to be turned on to charge the energy storage units in the N basic units, and after charging for a preset time period, control the energy storage units in the N basic units to discharge step by step; The control module is also used to control the charging and discharging of the N basic units in real time according to the comparison result between the output voltage and the preset voltage during the charging and discharging process of the energy storage unit.

3. The charge pump circuit according to claim 2, characterized in that: The control module is specifically used to control the energy storage units in the N basic units to discharge step by step, starting from the lowest level basic unit, after charging for a preset time period; The lowest level basic unit is the basic unit that is farthest connected to the power supply voltage during charging among the N basic units.

4. The charge pump circuit according to claim 2 or 3, characterized in that: The control module is further used to control the first switch to turn off after a preset charging time period; or, The control module is further configured to control the first switch to be turned off after the discharge cycle of any energy storage unit ends.

5. The charge pump circuit according to claim 2 or 3, characterized in that: The basic unit further includes: a second switch, a third switch and a fourth switch; Wherein, one end of the energy storage unit is connected to the voltage output end through the second switch, the other end of the energy storage unit is grounded through the third switch, and the other end of the energy storage unit is also connected to one end of the fourth switch; The second switch and the third switch are also connected to the control module; If the basic unit is the highest level basic unit, one end of the energy storage unit is also connected to the first switch; if the basic unit is not the highest level basic unit, one end of the energy storage unit is also connected to the other end of the fourth switch in the previous level basic unit; If the basic unit is a basic unit of the lowest level, the other end of the fourth switch is connected to the voltage output end; if the basic unit is not a basic unit of the lowest level, the other end of the fourth switch is connected to one end of the energy storage unit in the basic unit of the next level; The control module is specifically used to control the second switch and the third switch in the basic unit to be turned on one by one after charging for a preset time period, so as to discharge the energy storage unit in the basic unit.

6. The charge pump circuit according to claim 5, characterized in that: The control module is specifically used in the process of charging and discharging the energy storage unit: When the output voltage is greater than the preset voltage, if the current state is the discharge state of the energy storage unit of the target basic unit, the second switch and the third switch of the target basic unit are controlled to remain turned on so that the energy storage unit of the target basic unit remains discharged, until the output voltage is less than the preset voltage, the second switch and the third switch of the next-level basic unit of the target basic unit are controlled to be turned on so that the energy storage unit of the next-level basic unit is discharged; If the current state is the charging state of the energy storage unit, the first switch is controlled to remain turned on to maintain the charging state until the output voltage is less than the preset voltage, and the energy storage units in the N basic units are controlled to discharge step by step; When the output voltage is less than the preset voltage, the current state is kept unchanged.

7. The charge pump circuit according to claim 6, characterized in that: The control module is further configured to control the second switch and the third switch of the target basic unit to be turned off when controlling the second switch and the third switch of the next-level basic unit of the target basic unit to be turned on, so that the energy storage unit of the next-level basic unit is discharged, and the energy storage unit of the target basic unit ends discharging; or, The control module is also used to control all the second switches and the third switches of the N basic units to turn off after a charge and discharge cycle ends, and enter the next charge and discharge cycle.

8. The charge pump circuit according to claim 5, characterized in that: The control module is specifically used to control the second switch and the third switch in the basic unit to be turned on at the same time, so as to discharge the energy storage unit in the basic unit; or, The control module is specifically configured to first control the second switch in the basic unit to be turned on for a set time period, and then control the third switch in the basic unit to be turned on, so as to discharge the energy storage unit in the basic unit.

9. The charge pump circuit according to claim 5, characterized in that: The fourth switch is a diode or a MOS tube; If the fourth switch is a MOS tube, the fourth switch is also connected to the control module; the control module is used to control the first switch and the fourth switch to be turned on, and the second switch and the third switch to be turned off, so as to charge the energy storage unit in the N basic units, and is also used to control the second switch and the third switch to be turned on, and the fourth switch to be turned off, so as to discharge the energy storage unit.

10. A chip, characterized in that: The chip comprises the charge pump circuit according to any one of claims 1-9.

Images