Charge pump voltage stabilizing circuit, chip

Abstract

The application provides a charge pump voltage stabilizing circuit and a chip, which comprises a first comparator, an input end of which inputs a first preset voltage, and an opposite input end of which inputs an instantaneous voltage, the instantaneous voltage being positively correlated with the voltage of an energy storage element, and an output end of the first comparator being connected with a first oscillation unit and a second oscillation unit; the first oscillation unit and the second oscillation unit are used for alternately outputting level signals based on the output result of the first comparator; a charge pump is connected with the first oscillation unit and the second oscillation unit at an input end, and connected with the energy storage element through a first controlled unit at an output end, and the first controlled unit is used for starting charging the energy storage element in response to the level signals alternately input by the first oscillation unit and the second oscillation unit. According to the application, when the instantaneous voltage between the two ends of the energy storage element fluctuates, the charge pump can continuously work and quickly stabilize the voltage.

Description

[Technical Field]

[0001] The embodiments of the present invention relate to the technical field of circuits, and in particular to a charge pump voltage regulator circuit and chip. [Background Technology]

[0002] In order to achieve DC-side voltage level conversion, related technologies can use a charge pump to charge the energy storage element. During the charging process, the charge pump needs to be regulated to control the charging process.

[0003] In the charging and voltage regulation process, the voltage of the energy storage element is directly compared with the upper and lower limits of the energy storage element voltage using a comparator. However, the comparator has an offset voltage, which causes fluctuations in the comparator's output voltage, resulting in an unstable output voltage.

[0004] Meanwhile, if the voltage across the energy storage element needs to be adjusted quickly, a fixed-frequency generator needs to be designed. If the frequency of the fixed-frequency generator is set too low, the DC-DC converter will have a slow boost speed, resulting in a slow response. If the frequency of the fixed-frequency generator is set too high, the power loss of the voltage regulator circuit will be increased.

[0005] In summary, the voltage regulation performance of the charge pump voltage regulator circuit needs to be improved. [Summary of the Invention]

[0006] In view of the above, this application provides a charge pump voltage regulator circuit and chip to improve the poor voltage regulation performance of charge pump voltage regulator circuits in related technologies.

[0007] This invention provides a charge pump voltage regulator circuit, comprising:

[0008] The first comparator has a first preset voltage input at its non-inverting input terminal and an instantaneous voltage input at its inverting input terminal. The instantaneous voltage is positively correlated with the voltage of the energy storage element. Its output terminal is connected to the first oscillation unit and the second oscillation unit, respectively.

[0009] The first oscillation unit and the second oscillation unit are used to alternately output level signals based on the output result of the first comparator;

[0010] Charge pump: Its input terminal is connected to the first oscillation unit and the second oscillation unit, and its output terminal is connected to the energy storage element through the first controlled unit. It is used to respond to the level signals alternately input by the first oscillation unit and the second oscillation unit, and the first controlled unit starts to charge the energy storage element.

[0011] The first and second oscillation units can simultaneously power the charge pump, ensuring continuous operation and rapid voltage stabilization when the instantaneous voltage across the energy storage element fluctuates.

[0012] One possible approach is that the oscillation frequency of the first oscillation unit and the oscillation frequency of the second oscillation unit are the same, and the amplitudes are consistent, but the oscillation waveforms are opposite.

[0013] One possible approach is that the first oscillation unit includes an oscillator, and the second oscillation unit includes an inverter and an oscillator.

[0014] One possible approach is that the first oscillation unit includes a first oscillator, and the second oscillation unit includes a second oscillator, wherein the first oscillator and the second oscillator alternately output level signals by means of oscillation settings of the first oscillator and the second oscillator.

[0015] One possible approach is to have a second comparator with an instantaneous voltage input at its non-inverting input terminal and a second preset voltage input at its inverting input terminal, and its output terminal connected to the control terminals of the second and third controlled units, respectively.

[0016] The controlled terminal of the second controlled unit is connected to the control terminal of the first controlled unit;

[0017] When the instantaneous voltage is higher than the second preset voltage, the second controlled unit and the third controlled unit are turned on based on the output result of the output terminal of the second comparator, the controlled terminal of the second controlled unit controls the first controlled unit to turn off, and the voltage of the energy storage element drops.

[0018] One possible approach is to also include: a third oscillation unit and a fourth controlled unit:

[0019] The third oscillation unit is used to output a level signal;

[0020] The fourth controlled unit: its control terminal is connected to the third oscillation unit. Based on the level signal output by the third oscillation unit, it controls the second controlled unit and the third controlled unit to be turned on. The controlled terminal of the second controlled unit controls the first controlled unit to be turned off, and the voltage of the energy storage element drops.

[0021] One possible approach is that the level signal output by the third oscillation unit is opposite to the level signal output by the second oscillation unit.

[0022] One possible approach is that the first controlled unit, the second controlled unit, the third controlled unit, and the fourth controlled unit are of the type of MOSFET or transistor.

[0023] One possible approach is to further include a bias current output unit for outputting a bias current for the energy storage element, wherein the output terminal of the reference current output unit is connected to the first oscillation unit, and the bias current for the energy storage element adjusts the output frequency and / or amplitude of the first oscillation unit.

[0024] One possible approach is that the reference current output unit includes a current mirror and a current source;

[0025] The current mirror is used to replicate the input current of the energy storage element.

[0026] The current source is used to output a reference current.

[0027] The first oscillation unit is also connected to the output terminal of the current mirror and the current source, and is adjusted based on the bias current for the energy storage element, which is generated based on the reference current and the replication result of the input current of the energy storage element.

[0028] One possible approach is that the output of the current mirror is consistent with the input current of the energy storage element.

[0029] One possible approach is that the bias current output unit is the fifth controlled unit, and the control terminal of the fifth controlled unit is connected to the control terminal of the first controlled unit.

[0030] The fifth controlled unit is used to replicate the input current of the energy storage element according to a preset ratio.

[0031] The first oscillation unit is connected to the output terminal of the fourth controlled unit and is adjusted based on the bias current for the energy storage element, wherein the bias current for the energy storage element is the output current of the fourth controlled unit.

[0032] One possible approach is that the fifth controlled unit is either a MOSFET or a transistor.

[0033] It should be understood that the second embodiment of the present invention is consistent with the first aspect of the present invention, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, and will not be repeated here. [Attached Image Description]

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a diagram of a charge pump voltage regulator circuit provided in related technologies;

[0036] Figure 2 A schematic diagram of a charge pump voltage regulator circuit provided in an embodiment of this application;

[0037] Figure 3 Schematic diagrams of the output waveforms of the first oscillation unit and the second oscillation unit provided in the embodiments of this application;

[0038] Figure 4 A charge pump voltage regulator circuit diagram provided for an exemplary embodiment of this application;

[0039] Figure 5 A further charge pump voltage regulator circuit structure diagram provided in another embodiment of this application;

[0040] Figure 6 A charge pump voltage regulator circuit diagram provided in yet another embodiment of this application;

[0041] Figure 7 Another charge pump voltage regulator circuit diagram provided in this application embodiment;

[0042] Figure 8 A charge pump voltage regulator circuit diagram provided for another embodiment of this application;

[0043] Figure 9 This is another charge pump voltage regulator circuit diagram provided in the embodiments of this application;

[0044] Figure 10 A charge pump voltage regulator circuit diagram provided in yet another embodiment of this application;

[0045] Figure 11 A charge pump voltage regulator circuit diagram provided in yet another exemplary embodiment of this application.

Detailed Implementation Methods

[0046] To better understand the technical solutions of the embodiments of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] To achieve DC-side voltage level conversion, related technologies utilize charge pumps to charge energy storage devices. During the charging process, voltage regulation of the charge pump is necessary for control. Specifically, one feasible voltage regulation method is described below. Figure 1 As shown.

[0048] Specifically, capacitor C1 is used as the energy storage unit. The voltage across capacitor C1 is divided by resistors R1 and R2, and the instantaneous voltage Vout of the capacitor is fed into comparator V1 and comparator V2 respectively. If the voltage of Vout is lower than Vref-Lo, the first oscillator outputs a level signal, the output voltage of the charge pump increases, the transistor Q1 is in the conducting state, and the charge pump supplies power to the capacitor.

[0049] When the voltage across capacitor C1 is too high, exceeding Vref-hi, the comparator outputs a high level, which in turn controls transistors Q2 and Q3 to conduct.

[0050] When transistor Q2 is in the conducting state, it pulls down the base voltage of transistor Q1, turning off transistor Q1. At this time, the charge pump stops supplying power to capacitor C1, and the current flows to ground through transistor Q3. This ensures that the output voltage of Vout is always between Vref-Lo and Vref-hi.

[0051] Understandably, here Vref-hi corresponds to the maximum allowable voltage of Vout. In other words, when Vout = Vref-hi, the voltage across capacitor C1 is the maximum allowable operating voltage, and charging capacitor C1 is not allowed at this time. Correspondingly, here Vout = Vref-Lo corresponds to the minimum allowable voltage of Vout. When Vout = Vref-Lo, the voltage across capacitor C1 is the minimum allowable operating voltage, and capacitor C1 is not allowed to discharge at this time.

[0052] As can be seen from the above introduction, in the relevant technology, Vout is directly compared with Vref-hi during the charging voltage regulation process. However, the comparator has an offset voltage, which causes fluctuations in the comparator's output voltage, resulting in an unstable output voltage.

[0053] Meanwhile, when Vout experiences momentary jitter, if it is necessary to quickly adjust the voltage across capacitor C1, the design needs to be tailored to a fixed-frequency generator (first oscillator). If the frequency of the fixed-frequency generator is set too low, the charge pump's boost speed will be slow, resulting in a slow response speed. If the frequency of the fixed-frequency generator is set too high, it will increase the power loss of the voltage regulator circuit.

[0054] To address the aforementioned problems, this application provides a charge pump voltage regulator circuit, in Figure 1 Based on this, an oscillation unit is added, and the two oscillation units exchange output levels to continuously supply power to the charge pump.

[0055] Please refer to Figure 2 , Figure 2A charge pump voltage regulator circuit structure diagram provided in this application embodiment specifically includes:

[0056] The first comparator has a first preset voltage input at its non-inverting input terminal and an instantaneous voltage input at its inverting input terminal. The instantaneous voltage is positively correlated with the voltage of the energy storage element. Its output terminal is connected to the first oscillation unit and the second oscillation unit, respectively.

[0057] It should be noted that the instantaneous voltage here is used to characterize the magnitude of the voltage of the energy storage element. In some embodiments, it can be the voltage of the energy storage element, or it can be the voltage after voltage division of the energy storage element. No limitation is made here.

[0058] At the same time, when the instantaneous voltage is equal to the first preset voltage, the voltage of the energy storage element is the minimum allowable operating voltage.

[0059] The first oscillation unit and the second oscillation unit are used to alternately output level signals based on the output result of the first comparator;

[0060] It should be noted that the level signal here is mainly used to trigger the charge pump to work. For example, the charge pump will work when the oscillator outputs a level signal.

[0061] Charge pump: Its input terminal is connected to the first oscillation unit and the second oscillation unit, and its output terminal is connected to the energy storage element through the first controlled unit. It is used to respond to the level signals alternately input by the first oscillation unit and the second oscillation unit, and the first controlled unit starts to charge the energy storage element.

[0062] It should be noted that the meaning of alternating input here is that at any given time, one of the first oscillation unit and the second oscillation unit is guaranteed to output a level signal. In other words, in the embodiments provided in this application, the charge pump is always in working state.

[0063] It is worth noting that, here, the clock of the second oscillation unit is set to a low-frequency level signal or a pulse signal with a low pulse value. When the instantaneous voltage is less than the first preset voltage, the first oscillation unit intermittently outputs a level signal. When the first oscillation unit stops outputting a level signal, the second oscillation unit outputs a level signal.

[0064] The embodiments provided in this application enable the charge pump to maintain the DC-DC converter in a continuous working state by alternating input level signals, thereby allowing the DC-DC converter to quickly supply power to the supercapacitor when it needs to be charged.

[0065] Meanwhile, when setting the first oscillation unit and the second oscillation unit, low-frequency level signals or pulse signals with low pulse levels can be used. Compared with related technologies, which require setting the frequency of the fixed frequency generator to a high frequency, this ensures the boosting speed of the charge pump and saves energy.

[0066] Optionally, in order to enable the first oscillation unit and the second oscillation unit to alternately supply energy to the energy storage element, the electrical frequency signals output by the first oscillation unit and the second oscillation unit can be set as asynchronous output signals with the same frequency.

[0067] Optionally, the oscillation frequency of the first oscillation unit and the oscillation frequency of the second oscillation unit are the same, and the amplitudes are consistent, but the oscillation waveforms are opposite.

[0068] For example, please refer to Figure 3 ,exist Figure 3 It is assumed that the output level waveform of the first oscillation unit is... Figure 3 The waveform shown above illustrates the level waveform output by the second oscillation unit. (See the diagram above for details.) Figure 3 The waveform below is shown.

[0069] Optionally, the first oscillation unit includes an oscillator, and the second oscillation unit includes an inverter and an oscillator.

[0070] Optionally, the first oscillation unit includes a first oscillator, and the second oscillation unit includes a second oscillator. By setting the first oscillator and the second oscillator to oscillate, the first oscillator and the second oscillator alternately output level signals. Specifically, those skilled in the art can set the two oscillators by using a staggered output method.

[0071] This achieves the goal of having the first and second oscillation units output asynchronous level signals at the same frequency, alternately outputting level signals to the DC-DC converter.

[0072] Of course, in certain situations, the parameters of the first oscillation unit and the second oscillation unit can be set according to the user's needs.

[0073] It should be noted that the aforementioned first controlled unit can be a transistor or a MOSFET. Those skilled in the art can configure its connection method according to its conduction conditions, which will not be elaborated here.

[0074] It should also be noted that the transistors and MOSFETs mentioned here include NPN transistors, PNP transistors, P-channel enhancement-mode MOSFETs, P-channel depletion-mode MOSFETs, N-channel enhancement-mode MOSFETs, and N-channel depletion-mode MOSFETs, and are not limited to any particular type.

[0075] Please refer to Figure 4 , Figure 4 An exemplary embodiment of a charge pump voltage regulator circuit is provided, wherein resistors R1 and R2 divide the voltage across capacitor C1, and the voltage after voltage division corresponds to the instantaneous voltage, Vref-Lo, which corresponds to the first preset voltage.

[0076] Please refer to Figure 4 The output of comparator V1 is connected to the input of the oscillator and the input of the inverter. The output of the inverter is also connected to the input of another oscillator.

[0077] Understandably, Figure 4 In the embodiment shown, V1 corresponds to the first comparator, the oscillator connected to the comparator corresponds to the aforementioned first oscillation unit, and the inverter and another oscillator together constitute the second oscillation unit.

[0078] The collector of transistor Q1 is connected to a high level, the base of transistor Q1 is connected to a charge pump, and the emitter of transistor Q1 is connected to capacitor C1 and resistor R1 respectively.

[0079] When Vref-Lo (corresponding to the aforementioned instantaneous voltage) is lower than the first preset low voltage, comparator V1 outputs a high level. At this time, the two oscillators alternately trigger high-level signals to ensure that the charge pump continues to work. The charge pump outputs a high-level signal, and the base of transistor Q1 is turned on under the trigger of the high-level signal, and the voltage across capacitor C1 continues to increase.

[0080] It should be noted that the transistor Q1 here corresponds to the aforementioned first controlled unit.

[0081] Based on the foregoing embodiments, please refer to Figure 5 In order to achieve voltage clamping, some embodiments further include: a second comparator: its non-inverting input terminal receives an instantaneous voltage, its inverting input terminal receives a second preset voltage, and its output terminal is connected to the control terminals of the second controlled unit and the third controlled unit, respectively;

[0082] The controlled terminal of the second controlled unit is connected to the control terminal of the first controlled unit;

[0083] The controlled terminal of the third controlled unit is connected to the controlled terminal of the first controlled unit;

[0084] When the second instantaneous voltage is higher than the second preset voltage, the second controlled unit and the third controlled unit are turned on based on the output result of the output terminal of the second comparator, the controlled terminal of the second controlled unit controls the first controlled unit to turn off, and the voltage of the energy storage element drops.

[0085] It is worth noting that here, when the instantaneous voltage is equal to the second preset voltage, the voltage across the energy storage element is the maximum allowable operating voltage. At this time, it is not allowed to continue supplying power to the energy storage element. When the instantaneous voltage is higher than the second preset voltage, the voltage of the energy storage element needs to be reduced. In other words, the voltage of the energy storage element needs to be clamped.

[0086] Therefore, when the instantaneous voltage is higher than the second preset voltage, both the second and third controlled units are in a conducting state. At this time, the first controlled unit is turned off under the action of the second controlled unit. When the third controlled unit is turned on, the energy storage element discharges through the path formed by the third controlled unit, and the voltage of the energy storage element drops.

[0087] Based on this, voltage clamping can be achieved, further improving the voltage regulation effect.

[0088] Specifically, in Figure 4 Based on this, please refer to Figure 6 When the voltage across resistor R2 is higher than Vref-hi, transistors Q2 and Q3 are turned on. When transistor Q2 is turned on, the collector is at a low level. At this time, transistor Q1 is turned off, and the voltage across capacitor C1 discharges through transistor Q3, causing the voltage across capacitor C1 to decrease.

[0089] Understandably, in this example, Vref-hi corresponds to the second preset voltage, transistor Q2 corresponds to the second controlled unit, its base corresponds to the control terminal of the second controlled unit, its collector corresponds to the controlled terminal of the second controlled unit, transistor Q3 corresponds to the third controlled unit, and capacitor C1 corresponds to the energy storage element.

[0090] It should also be noted that an NPN transistor is used in this embodiment. Those skilled in the art can replace the NPN transistor with a PNP transistor or a MOSFET according to its turn-off conditions, which will not be elaborated here.

[0091] Based on the foregoing embodiments, please refer to Figure 7 , Figure 7 This application provides a charge pump voltage regulator circuit diagram, which is different from the previous one. Figure 5 The illustrated embodiment also includes:

[0092] The third oscillation unit is used to output a level signal;

[0093] The fourth controlled unit: its control terminal is connected to the third oscillation unit. Based on the level signal output by the third oscillation unit, it controls the second controlled unit and the third controlled unit to be turned on. The controlled terminal of the second controlled unit controls the first controlled unit to be turned off, and the voltage of the energy storage element drops.

[0094] and Figure 5 The difference between the illustrated embodiments is that, in this embodiment, in order to accelerate the turn-off speed of the first controlled unit and improve the voltage regulation effect, the level signal output by the third oscillation unit is used to control the fourth controlled unit. When the fourth controlled unit is turned on, the second and third controlled units are turned on. At this time, the controlled terminal of the second controlled unit controls the first controlled unit to turn off, and the voltage of the energy storage element drops, thereby increasing the speed. It can also cooperate with the aforementioned second oscillation unit to clamp the output voltage of the charge pump when the output voltage of the charge pump is too high.

[0095] Please refer to Figure 8 Compared to Figure 6 In this embodiment, when the third oscillation unit outputs a low level, transistor Q4 is turned on. At this time, transistors Q2 and Q3 are also turned on. The collector of transistor Q2 is at a low level, and transistor Q1 is turned off. At this time, the charge pump stops charging capacitor C1.

[0096] Understandably, in this example, Vref-hi corresponds to the second preset voltage, transistor Q2 corresponds to the second controlled unit, its base corresponds to the control terminal of the second controlled unit, its collector corresponds to the controlled terminal of the second controlled unit, transistor Q3 corresponds to the third controlled unit, transistor Q4 corresponds to the fourth controlled unit, and capacitor C1 corresponds to the energy storage element.

[0097] As mentioned above, the output levels of the third oscillation unit and the first oscillation unit are opposite in direction. In other words, the first oscillation unit outputs a high level, and the third oscillation unit outputs a low level.

[0098] Here, the first oscillation unit and the third oscillation unit can be turned on alternately, or they can be set as needed, without any restrictions.

[0099] It should also be noted that, Figure 8 In this application, the second controlled unit, the third controlled unit, and the fourth controlled unit are specifically NPN transistors. Those skilled in the art can, under the guidance of the application, replace the third controlled unit and the fourth controlled unit with a PNP transistor.

[0100] In other words, the second controlled unit, the third controlled unit, and the fourth controlled unit are of the type of MOS transistor or triode.

[0101] Based on the foregoing embodiments, please refer to Figure 9 Based on any of the foregoing embodiments, in Figure 9In the illustrated embodiment, a bias current output unit is added. Here, the bias current output unit is used to output a bias current for the energy storage element. The output terminal of the reference current output unit is connected to the first oscillation unit. The bias current for the energy storage element adjusts the output frequency and / or amplitude of the first oscillation unit.

[0102] In some embodiments, the reference current output unit includes a current mirror and a current source;

[0103] The current mirror is used to replicate the input current of the energy storage element.

[0104] The current source is used to output a reference current.

[0105] The first oscillation unit is also connected to the output terminal of the current mirror and the current source, and is adjusted based on the bias current for the energy storage element, which is generated based on the reference current and the replication result of the input current of the energy storage element.

[0106] In this embodiment, a closed-loop feedback is constructed by biasing the energy storage element, and the output frequency of the first oscillation unit is adjusted by using the biasing current of the energy storage element.

[0107] Please refer to Figure 10 One possible way is, compared to Figure 4 In this embodiment, transistors Q5, Q6, and Q7 form a current mirror. When the parameters of transistors Q5 and Q1 are exactly the same, the emitter current of transistor Q5 is equal to the input current of capacitor C1. Transistors Q6 and Q7 are connected with a common base, and the current output from the collector of transistor Q7 is equal to the input current of capacitor C1. Here, according to Kirchhoff's current law, Fre-sel is the difference between the current input to the current source and the collector current of transistor Q7. Thus, Fre-sel is the difference between the current input to the current source and the input current of capacitor C1. Fre-sel serves as a bias current for the energy storage element and is fed back to the first oscillation unit.

[0108] When the input current of the current source is greater than the input current of capacitor C1, the output frequency of the first oscillation unit is increased, the output voltage of the charge pump increases, and the capacitor charging rate accelerates. When the input current of the current source is less than the input current of capacitor C1, the output frequency of the first oscillation unit is decreased, and the capacitor charging rate decreases.

[0109] thus, Figure 6In the embodiment shown, transistors Q5, Q6, and Q7 correspond to current mirrors, and the collector input current of transistor Q7 is the input current of the replicated energy storage element.

[0110] Fre-sel corresponds to the bias current for the energy storage element mentioned above.

[0111] It is understood that the above embodiments are only one possible implementation of current replication in this application and are not intended to limit the rights of this application. Any adjustment of the first oscillation unit by a person skilled in the art using the bias current as the feedback current should be included within the scope of protection of this application.

[0112] In some other embodiments, the bias current output unit is the fifth controlled unit, and the control terminal of the fifth controlled unit is connected to the control terminal of the first controlled unit.

[0113] The fifth controlled unit is used to replicate the input current of the energy storage element according to a preset ratio.

[0114] The first oscillation unit is connected to the output terminal of the fourth controlled unit and is adjusted based on the bias current for the energy storage element, wherein the bias current for the energy storage element is the output current of the fourth controlled unit.

[0115] Please refer to Figure 11 One possible way is to, in Figure 4 Based on the illustrated embodiment, a transistor Q8 is added. Transistor Q8 is connected to the common base of transistor Q1. A high level is applied to the collector of transistor Q8, and the emitter of transistor Q8 is connected to the first oscillation unit. The emitter current is fed back to the first oscillation unit, and the first oscillation unit adjusts the frequency based on the emitter current of transistor Q8.

[0116] Specifically, when the emitter current is small or the input current of capacitor C1 does not change, the output frequency of the first oscillation unit is small or the first oscillation unit does not work. When the emitter current of transistor Q8 increases, it indicates that the input power of the charge pump needs to be increased to improve the charging speed. At this time, the output frequency of the first oscillation unit is increased.

[0117] It should be noted that the transistor Q8 here corresponds to the aforementioned fifth control unit. The preset ratio can be determined by the size (e.g., length and width) of the two transistors. It should also be noted that those skilled in the art can replace the fifth controlled unit with other types of transistors or MOSFETs in accordance with the teachings of this application. The same effect of replicating the input current of the supercapacitor should be included in the protection scope of this application.

[0118] It should be noted that the energy storage components involved in the embodiments of the present invention may include, but are not limited to, flywheel energy storage units, lithium batteries, supercapacitors, lead-acid energy storage, etc.

[0119] This application also provides a chip including the charge pump voltage regulator circuit mentioned in the foregoing embodiments. For a description of the charge pump voltage regulator circuit, please refer to the foregoing embodiments. To avoid repetition, it will not be described again here.

[0120] It should be noted that the chip in this application can be in the form of an MCU (Micro Control Unit), DSP (Digital Signal Processor), MPU (Micro Processor Unit), or micro CPU (Central Processing Unit), and is not limited to any particular form.

[0121] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A charge pump voltage regulator circuit, characterized in that, include: The first comparator has a first preset voltage input at its non-inverting input terminal and an instantaneous voltage input at its inverting input terminal. The instantaneous voltage is positively correlated with the voltage of the energy storage element. Its output terminal is connected to the first oscillation unit and the second oscillation unit, respectively. The first oscillation unit and the second oscillation unit are used to alternately output level signals based on the output result of the first comparator; Charge pump: Its input terminal is connected to the first oscillation unit and the second oscillation unit, and its output terminal is connected to the energy storage element through the first controlled unit. It is used to respond to the level signals alternately input by the first oscillation unit and the second oscillation unit, and the first controlled unit starts to charge the energy storage element.

2. The circuit according to claim 1, characterized in that, The first oscillation unit has the same oscillation frequency and the second oscillation unit has the same amplitude, but the oscillation waveforms are opposite.

3. The circuit according to claim 1, characterized in that, The first oscillation unit includes an oscillator, and the second oscillation unit includes an inverter and an oscillator.

4. The circuit according to claim 1, characterized in that, The first oscillation unit includes a first oscillator, and the second oscillation unit includes a second oscillator. By setting the first oscillator and the second oscillator to oscillate, the first oscillator and the second oscillator alternately output level signals.

5. The circuit according to claim 1, characterized in that, Also includes: The second comparator has an instantaneous voltage input at its non-inverting input terminal and a second preset voltage input at its inverting input terminal. Its output terminal is connected to the control terminals of the second controlled unit and the third controlled unit, respectively. The controlled terminal of the second controlled unit is connected to the control terminal of the first controlled unit; When the instantaneous voltage is higher than the second preset voltage, the second controlled unit and the third controlled unit are turned on based on the output result of the output terminal of the second comparator, the controlled terminal of the second controlled unit controls the first controlled unit to turn off, and the voltage of the energy storage element drops.

6. The circuit according to claim 5, characterized in that, Also includes: The third oscillating unit and the fourth controlled unit: The third oscillation unit is used to output a level signal; The fourth controlled unit: its control terminal is connected to the third oscillation unit. Based on the level signal output by the third oscillation unit, it controls the second controlled unit and the third controlled unit to be turned on. The controlled terminal of the second controlled unit controls the first controlled unit to be turned off, and the voltage of the energy storage element drops.

7. The circuit according to claim 6, characterized in that, The level signal output by the third oscillation unit is opposite to the level signal output by the second oscillation unit.

8. The circuit according to claim 6, characterized in that... The types of the first controlled unit, the second controlled unit, the third controlled unit, and the fourth controlled unit are: MOS transistor and transistor.

9. The circuit according to any one of claims 1 to 8, characterized in that, It also includes a bias current output unit for outputting a bias current for the energy storage element. The output terminal of the bias current output unit is connected to the first oscillation unit, and the bias current for the energy storage element adjusts the output frequency and / or amplitude of the first oscillation unit.

10. The circuit according to claim 9, characterized in that, The bias current output unit includes a current mirror and a current source; The current mirror is used to replicate the input current of the energy storage element. The current source is used to output a reference current. The first oscillation unit is also connected to the output terminal of the current mirror and the current source, and is adjusted based on the bias current for the energy storage element, which is generated based on the reference current and the replication result of the input current of the energy storage element.

11. The circuit according to claim 10, characterized in that, The output of the current mirror is consistent with the input current of the energy storage element.

12. The circuit according to claim 9, characterized in that, The bias current output unit is the fifth controlled unit, and the control terminal of the fifth controlled unit is connected to the control terminal of the first controlled unit. The fifth controlled unit is used to replicate the input current of the energy storage element according to a preset ratio. The first oscillation unit is connected to the output terminal of the fifth controlled unit and is adjusted based on the bias current for the energy storage element, wherein the bias current for the energy storage element is the output current of the fifth controlled unit.

13. The circuit according to claim 12, characterized in that, The fifth controlled unit is either a MOSFET or a transistor.

14. A chip, characterized in that, Includes the charge pump voltage regulator circuit as described in any one of claims 1 to 13.

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