CN114400889A - Output voltage control circuit and method for charge pump - Google Patents
Output voltage control circuit and method for charge pump Download PDFInfo
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- CN114400889A CN114400889A CN202210090939.6A CN202210090939A CN114400889A CN 114400889 A CN114400889 A CN 114400889A CN 202210090939 A CN202210090939 A CN 202210090939A CN 114400889 A CN114400889 A CN 114400889A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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Abstract
The invention discloses a charge pump output voltage control circuit and a method, wherein the circuit comprises a clock frequency adjusting module, an oscillator and a charge pump, wherein the clock frequency adjusting module is connected with the oscillator, and the oscillator is connected with the charge pump; the clock frequency adjusting module is used for outputting a corresponding frequency adjusting signal to the oscillator according to the working state of the charge pump; the oscillator is used for adjusting the frequency of the clock signal according to the frequency adjusting signal and outputting the clock signal after the frequency adjustment to the charge pump; the charge pump is used for outputting bias voltage according to the received clock signal and the input voltage. The clock frequency adjusting module outputs the frequency adjusting signal according to the working state of the charge pump, the oscillator adjusts the frequency of the clock signal according to the frequency adjusting signal and then sends the adjusted frequency to the charge pump, the charge pump outputs the bias voltage according to the clock signal, and the frequency of the clock signal can be adjusted according to the working state of the charge pump, so that the boosting time length of the charge pump is shortened, and the boosting efficiency of the charge pump is improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a charge pump output voltage control circuit and a charge pump output voltage control method.
Background
At present, when a sensor microphone works, mechanical deformation generated by sound pressure acting on a vibrating diaphragm of the sensor microphone can be converted into an electric signal with a certain amplitude value under a stable and low-noise bias voltage, a charge pump is generally adopted to generate a direct current level to provide bias for the sensor microphone, and the conventional control circuit controls the charge pump to have too long boosting time, so that the boosting efficiency of the charge pump is low, and how to improve the boosting efficiency of the charge pump becomes a technical problem to be solved urgently.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a charge pump output voltage control circuit and a charge pump output voltage control method, and aims to solve the technical problem of low boosting efficiency of a charge pump.
In order to achieve the above object, the present invention provides a charge pump output voltage control circuit and method, wherein the charge pump output voltage control circuit comprises: the device comprises a clock frequency adjusting module, an oscillator and a charge pump, wherein the clock frequency adjusting module is connected with the oscillator, and the oscillator is connected with the charge pump;
the clock frequency adjusting module is used for outputting a corresponding frequency adjusting signal to the oscillator according to the working state of the charge pump;
the oscillator is used for adjusting the frequency of a clock signal according to the frequency adjusting signal and outputting the clock signal with the adjusted frequency to the charge pump;
the charge pump is used for outputting bias voltage according to the received clock signal and the input voltage.
Optionally, the clock frequency adjustment module is further configured to output a frequency adjustment signal to the oscillator according to the current bias voltage output by the charge pump.
Optionally, the clock frequency adjustment module includes a voltage detection unit;
the voltage detection unit is used for detecting the current bias voltage output by the charge pump and outputting a frequency increasing signal to the oscillator when the current bias voltage is smaller than a preset voltage;
the oscillator is further configured to increase the frequency of the clock signal according to the frequency increasing signal, and output the clock signal with the increased frequency to the charge pump.
Optionally, the voltage detection unit is further configured to output a frequency reduction signal to the oscillator when the current bias voltage is greater than or equal to the preset voltage;
the oscillator is further configured to reduce the frequency of the clock signal according to the frequency reduction signal, and output the clock signal with the reduced frequency to the charge pump.
Optionally, the clock frequency adjusting module is further configured to output a frequency adjusting signal to the oscillator according to a power-on duration of the charge pump.
Optionally, the clock frequency adjustment module includes a power-on reset unit;
the power-on reset unit is used for acquiring the power-on time length of the charge pump and outputting a frequency increasing signal to the oscillator when the power-on time length is less than a preset time length;
the power-on reset unit is further configured to output a frequency reduction signal to the oscillator when the power-on duration is greater than or equal to the preset duration.
Optionally, the oscillator includes a MOS transistor, a capacitor, and N not gates, where N is an odd number greater than or equal to 3;
the grid of MOS pipe is the input of frequency control signal, the source electrode of MOS pipe with the first end of electric capacity is connected, the second end ground connection of electric capacity, the output and the input end-to-end of a N NOT gate, the drain electrode of MOS pipe is connected with the output of first NOT gate, the output of Nth NOT gate is clock signal's output.
In order to achieve the above object, the present invention further provides a control method for an output voltage of a charge pump, where the control method for the output circuit of the charge pump includes:
when the charge pump is electrified, monitoring the working state of the charge pump in real time;
and outputting a corresponding frequency adjusting signal to the oscillator according to the working state, so that the oscillator adjusts the frequency of the clock signal output to the charge pump according to the frequency adjusting signal.
Optionally, the operating state includes a current bias voltage output by the charge pump; the outputting a corresponding frequency adjusting signal to the oscillator according to the operating state so that the oscillator adjusts the frequency of the clock signal output to the charge pump according to the frequency adjusting signal includes:
detecting the current bias voltage output by the charge pump;
when the current bias voltage is smaller than a preset voltage, outputting a frequency increasing signal to the oscillator so that the oscillator increases the frequency of a clock signal output to the charge pump according to the frequency increasing signal;
and when the bias voltage is greater than or equal to a preset voltage, outputting a frequency reduction signal to the oscillator so as to reduce the frequency of a clock signal output to the charge pump according to the frequency reduction signal.
Optionally, the step of outputting a corresponding frequency adjustment signal to the oscillator according to the operating state so that the oscillator adjusts the frequency of the clock signal output to the charge pump according to the frequency adjustment signal includes:
acquiring the power-on time of the charge pump;
when the power-on duration is less than a preset duration, outputting a frequency increasing signal to the oscillator so that the oscillator increases the frequency of a clock signal output to the charge pump according to the frequency increasing signal;
and when the power-on duration is greater than or equal to a preset duration, outputting a frequency reduction signal to the oscillator so that the oscillator reduces the frequency of a clock signal output to the charge pump according to the frequency reduction signal.
The invention provides a charge pump output voltage control circuit, which comprises: the device comprises a clock frequency adjusting module, an oscillator and a charge pump, wherein the clock frequency adjusting module is connected with the oscillator, and the oscillator is connected with the charge pump; the clock frequency adjusting module is used for outputting a corresponding frequency adjusting signal to the oscillator according to the working state of the charge pump; the oscillator is used for adjusting the frequency of a clock signal according to the frequency adjusting signal and outputting the clock signal with the adjusted frequency to the charge pump; the charge pump is used for outputting bias voltage according to the received clock signal and the input voltage. The clock frequency adjusting module outputs the frequency adjusting signal according to the working state of the charge pump, the oscillator adjusts the frequency of the clock signal according to the frequency adjusting signal and then sends the adjusted frequency to the charge pump, and the charge pump outputs the bias voltage according to the clock signal, so that the frequency of the clock signal can be adjusted according to the working state of the charge pump, the boosting time length of the charge pump is shortened, and the boosting efficiency of the charge pump is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of a charge pump output voltage control circuit according to a first embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a charge pump according to a first embodiment of the output voltage control circuit of the charge pump of the present invention;
FIG. 3 is a functional block diagram of a clock frequency adjustment module of the output voltage control circuit of the charge pump according to the present invention;
FIG. 4 is a functional block diagram of a charge pump output voltage control circuit according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of an oscillator circuit according to a second embodiment of the charge pump output voltage control circuit of the present invention;
FIG. 6 is a flowchart illustrating a method for controlling output voltage of a charge pump according to a first embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Clock |
20 | |
| 30 | Charge pump | 101 | Voltage detection unit |
| 102 | Power-on reset unit | M1 | A first triode |
| M2 | Second triode | M3 | Third triode |
| M4 | The fourth triode | VIN | Input voltage |
| clk1 | A first clock signal | clk2 | Second clock signal |
| Vout | Bias voltage | Q | MOS tube |
| C | Capacitor with a capacitor element | F1 | First NOT gate |
| F2 | Second NOT gate | F3 | Third NOT gate |
| F4 | Fourth NOT gate | F5 | Fifth NOT gate |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a charge pump output voltage control circuit.
Referring to fig. 1, a first embodiment of a charge pump output voltage control circuit is proposed, in the embodiment of the present invention, the charge pump output voltage control circuit includes a clock frequency adjusting module 10, an oscillator 20 and a charge pump 30, the clock frequency adjusting module 10 is connected to the oscillator 20, and the oscillator 20 is connected to the charge pump 30;
the clock frequency adjusting module 10 is configured to output a corresponding frequency adjusting signal to the oscillator 20 according to the working state of the charge pump.
It should be understood that the operating state of the charge pump may be a state determined by monitoring current operating parameters of the charge pump, which are different and different; the frequency adjusting signal may output a signal for adjusting the frequency of the clock signal according to different operating states, and the frequency adjusting signal may adjust the frequency of the clock signal to be increased or the frequency of the clock signal to be decreased.
It will be appreciated that the charge pump can convert an input low voltage to a high voltage, and in a sensor microphone, the charge pump converts an input level well below the supply voltage to a dc level that satisfies the sensor microphone bias voltage.
It should be understood that the structure of the charge pump can refer to fig. 2, in fig. 2, when clk1 is low and clk2 is high, M1 is turned on, VIN charges C1, and charges source potential V1 of M1 to VIN-Vth; when clk1 is high and clk2 is low, since the voltage across the capacitor cannot change abruptly, V1 is raised to VIN-Vth + Vclk, M2 is turned on, C1 charges C2, and V2 is raised to VIN-2Vth + Vclk, and thus the output voltage Vout of the charge pump is raised by the round-trip loop.
The oscillator 20 is configured to adjust a frequency of a clock signal according to the frequency adjustment signal, and output the clock signal with the adjusted frequency to the charge pump 30.
It should be understood that when the oscillator receives the frequency adjustment signal, the oscillator increases or decreases the frequency of the clock signal according to the type of the frequency adjustment signal, and outputs the clock signal with the adjusted frequency to the charge pump.
It can be understood that, with reference to fig. 2, the VIN terminal continuously transfers charges to the load capacitor, and the voltage of the bias voltage Vout output by the charge pump gradually rises with the increase of the charged charges, so that the bias voltage Vout output by the charge pump has a boosting process, and the boosting process of the charge pump is mainly affected by the clock frequency, so that the present embodiment shortens the boosting time duration by adjusting the frequency of the clock signal during the boosting process of the charge pump.
The charge pump 30 is configured to output a bias voltage according to the received clock signal and the input voltage.
In a specific implementation, the clock frequency adjusting module may determine a working state of the charge pump according to the monitored current working parameter of the charge pump, and output a frequency adjusting signal corresponding to the working state to the oscillator, the oscillator increases or decreases a frequency of the clock signal according to the received frequency adjusting signal, and outputs the clock signal with the adjusted frequency to the charge pump, and the charge pump outputs a bias voltage to the sensor microphone according to the clock signal and the input voltage.
Further, in order to improve the boosting efficiency of the charge pump, the clock frequency adjustment module 10 is further configured to output a frequency adjustment signal to the oscillator 20 according to the current bias voltage output by the charge pump.
It is understood that the bias voltage is the voltage output by the charge pump; the clock frequency adjusting module can output a corresponding frequency adjusting signal to the oscillator according to the bias voltage output by the charge pump.
Further, referring to fig. 3, in an application, the boosting duration may be reduced by increasing the frequency of the clock signal, but may result in an increase of the dynamic power consumption of the charge pump, in order to reduce the dynamic power consumption of the charge pump while increasing the boosting efficiency, the clock frequency adjusting module 10 includes a voltage detecting unit 101;
the voltage detection unit 101 is configured to detect a current bias voltage output by the charge pump, and output a frequency increase signal to the oscillator when the current bias voltage is smaller than a preset voltage.
It is understood that the preset voltage may be a preset voltage for determining the operating state of the charge pump; the preset voltage is smaller than the stable bias voltage output by the charge pump when the charge pump works normally, and the difference value between the preset voltage and the stable bias voltage can be set according to specific scenes.
It should be understood that when the present bias voltage is less than the preset voltage, it can be determined that the charge pump is in the early stage of the step-up phase, and the voltage detection unit outputs the frequency increase signal to the oscillator.
The oscillator 20 is further configured to increase the frequency of the clock signal according to the frequency increasing signal, and output the clock signal with the increased frequency to the charge pump.
It should be understood that, after receiving the frequency increasing signal, the oscillator increases the frequency of the clock signal, and sends the frequency-increased clock signal to the oscillator; the charge pump output voltage control circuit further comprises a low-pass filter 40, wherein the low-pass filter 40 is connected with the charge pump and filters the bias voltage output by the charge pump and then outputs the filtered bias voltage.
It can be understood that when the current bias voltage of the charge pump is smaller than the preset voltage, it can be determined that the charge pump is in the initial stage of boosting, and at this time, the frequency of the clock signal can be controlled to be increased, so that the charge pump operates under the clock signal with higher frequency, the boosting duration of the charge pump is shortened, and the boosting efficiency is increased.
Further, the increase of the frequency of the clock signal may increase the dynamic power consumption of the charge pump, and in order to reduce the dynamic power consumption of the charge pump, the voltage detection unit 101 is further configured to output a frequency reduction signal to the oscillator 20 when the current bias voltage is greater than or equal to the preset voltage.
It can be understood that, when the current bias voltage of the charge pump is greater than or equal to the preset voltage, it may be determined that the charge pump is in the late stage of boosting, that is, the bias voltage output by the charge pump is already close to the stable bias voltage output by the charge pump during normal operation, and at this time, the voltage detection unit outputs the frequency reduction signal to the oscillator.
The oscillator 20 is further configured to reduce the frequency of the clock signal according to the frequency reduction signal, and output the clock signal with the reduced frequency to the charge pump 30.
It should be understood that the oscillator, upon receiving the frequency reduction signal, reduces the frequency of the clock signal to the normal operating frequency of the charge pump and sends the reduced frequency clock signal to the oscillator.
In a specific implementation, a preset voltage can be preset, the preset voltage can be set to be smaller than a stable bias voltage, in the boosting process of the charge pump, the voltage detection unit detects a current bias voltage output by the charge pump, when the current bias voltage is smaller than the preset voltage, the charge pump can be judged to be in a boosting initial stage, a frequency increasing signal is output to the oscillator, the oscillator increases the frequency of a clock signal and then outputs the clock signal to the charge pump, the charge pump works under a high-frequency clock signal, and the boosting duration is shortened; when the current bias voltage is greater than or equal to the preset voltage, the charge pump can be judged to be in the later stage of boosting, a frequency reduction signal is output to the oscillator, the oscillator reduces the frequency of the clock signal to the normal working frequency and then outputs the clock signal to the charge pump, and the charge pump works under the clock signal of the normal working frequency to reduce the dynamic effect of the charge pump.
This embodiment proposes a charge pump output voltage control circuit, which includes: the device comprises a clock frequency adjusting module, an oscillator and a charge pump, wherein the clock frequency adjusting module is connected with the oscillator, and the oscillator is connected with the charge pump; the clock frequency adjusting module is used for outputting a corresponding frequency adjusting signal to the oscillator according to the working state of the charge pump; the oscillator is used for adjusting the frequency of a clock signal according to the frequency adjusting signal and outputting the clock signal with the adjusted frequency to the charge pump; the charge pump is used for outputting bias voltage according to the received clock signal and the input voltage. The clock frequency adjusting module of the embodiment outputs the frequency adjusting signal according to the working state of the charge pump, the oscillator adjusts the frequency of the clock signal according to the frequency adjusting signal and then sends the adjusted frequency to the charge pump, and the charge pump outputs the bias voltage according to the clock signal, so that the frequency of the clock signal can be adjusted according to the working state of the charge pump, the boosting time length of the charge pump is shortened, and the boosting efficiency of the charge pump is improved.
Referring to fig. 4, a second embodiment of the output voltage control circuit of the charge pump is provided, in this embodiment, the clock frequency adjusting module 10 is further configured to output a frequency adjusting signal to the oscillator 20 according to a power-on duration of the charge pump.
It should be understood that the power-on time period may be the time period from the time the charge pump starts to boost to the monitoring time; the clock frequency adjusting module outputs a frequency adjusting signal to the oscillator according to the power-on duration of the charge pump.
Further, with continued reference to fig. 4, in order to improve the boosting efficiency of the charge pump, the clock frequency adjustment module 10 includes a power-on reset unit 102;
the power-on reset unit 102 is configured to obtain a power-on duration of the charge pump, and output a frequency increase signal to the oscillator 20 when the power-on duration is less than a preset duration.
It is understood that the preset time period may be a preset time period for determining the operating state of the charge pump; the preset time period is set to be shorter than a normal time period required for the charge pump to normally boost, and for example, the preset time period may be set to be half of the normal time period.
It should be understood that, the power-on reset unit obtains the power-on duration of the charge pump, and when the power-on duration is less than the preset duration, it may be determined that the operating state of the charge pump is in the initial stage of boosting, at this time, the power-on reset unit outputs a frequency increase signal to the oscillator, the oscillator increases the frequency of the clock signal according to the frequency increase signal, and outputs the clock signal with the increased frequency to the charge pump, and the charge pump operates under the high-frequency clock signal, so as to reduce the boosting duration of the charge pump and improve the boosting efficiency of the charge pump.
The power-on reset unit 102 is further configured to output a frequency reduction signal to the oscillator 20 when the power-on duration is greater than or equal to the preset duration.
It can be understood that, when the power-on duration is greater than or equal to the preset duration, it may be determined that the operating state of the charge pump is in the later stage of boosting, at this time, the power-on reset unit outputs a frequency reduction signal to the oscillator, the oscillator reduces the frequency of the clock signal to the positive operating frequency according to the frequency reduction signal, and outputs the clock signal with the reduced frequency to the charge pump, and the charge pump operates under the clock signal with the normal operating frequency, so as to reduce the dynamic power consumption of the charge pump.
Further, referring to fig. 5, in order to adjust the frequency of the clock signal, the dynamic power consumption of the charge pump is reduced while the boosting efficiency of the charge pump is improved, and the oscillator includes a MOS transistor, a capacitor, and N not gates, where N is an odd number greater than or equal to 3;
the grid of MOS pipe is the input of frequency control signal, the source electrode of MOS pipe with the first end of electric capacity is connected, the second end ground connection of electric capacity, the output and the input end-to-end of a N NOT gate, the drain electrode of MOS pipe is connected with the output of first NOT gate, the output of Nth NOT gate is clock signal's output.
It can be understood that the frequency adjusting signal includes a frequency increasing signal and a frequency decreasing signal, the frequency increasing signal is a low level signal, the frequency decreasing signal is a high level signal, when the frequency adjusting signal input by the gate of the MOS transistor is the frequency increasing signal, the MOS transistor is turned off, the capacitor is isolated by the MOS transistor, the oscillator circuit is not connected, and at this time, the oscillator outputs a high frequency clock signal; when the frequency signal input by the grid electrode of the MOS tube is the frequency reducing signal, the MOS tube is conducted, the capacitor is connected into the oscillator circuit, the clock frequency of the oscillator is reduced, and the charge pump works under the clock signal with the normal frequency.
The clock frequency adjusting module of the embodiment comprises a power-on reset unit; the power-on reset unit is used for acquiring the power-on duration of the charge pump and outputting a frequency increase signal to the oscillator when the power-on duration is less than a preset duration. The power-on reset unit is further configured to output a frequency reduction signal to the oscillator when the power-on duration is greater than or equal to the preset duration. The frequency increasing signal or the frequency reducing signal can be output according to the relation between the power-on duration and the preset duration of the charge pump, so that the charge pump works under a high-frequency clock signal at the initial stage of boosting and works under a clock signal of a normal working frequency at the later stage of boosting, and the dynamic power consumption of the charge pump is reduced while the boosting efficiency of the charge pump is improved.
Referring to fig. 6, fig. 6 is a flowchart illustrating a method for controlling an output voltage of a charge pump according to a first embodiment of the present invention.
As shown in fig. 6, the method for controlling the output voltage of the charge pump according to the embodiment of the present invention includes:
step S10: and when the charge pump is electrified, monitoring the working state of the charge pump in real time.
It should be noted that the execution subject of the embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, etc., or an electronic device, a charge pump output voltage control device, etc., capable of implementing the above functions. The present embodiment and the following embodiments will be described below by taking a charge pump output voltage control device as an example.
It is understood that the operating state of the charge pump includes the current bias voltage of the output of the charge pump and the power-on time period of the charge pump.
Step S20: and outputting a corresponding frequency adjusting signal to the oscillator according to the working state, so that the oscillator adjusts the frequency of the clock signal output to the charge pump according to the frequency adjusting signal.
It can be understood that the frequency adjustment signals are different for different operating states; the charge pump output voltage control device monitors the working state of the charge pump, outputs a corresponding frequency adjusting signal according to the working state of the charge pump, so that the oscillator increases or decreases the frequency of the clock signal according to the frequency adjusting signal, and outputs the clock signal with the frequency adjusted to the charge pump.
Further, in order to improve the boosting efficiency of the charge pump, the working state comprises the current bias voltage output by the charge pump; the outputting a corresponding frequency adjusting signal to the oscillator according to the operating state so that the oscillator adjusts the frequency of the clock signal output to the charge pump according to the frequency adjusting signal includes: detecting the current bias voltage output by the charge pump; when the current bias voltage is smaller than a preset voltage, outputting a frequency increasing signal to the oscillator so that the oscillator increases the frequency of a clock signal output to the charge pump according to the frequency increasing signal; and when the bias voltage is greater than or equal to a preset voltage, outputting a frequency reduction signal to the oscillator so as to reduce the frequency of a clock signal output to the charge pump according to the frequency reduction signal.
In a specific implementation, the charge pump output voltage control device detects a current bias voltage output by the charge pump, when the current bias voltage is smaller than a preset voltage, the charge pump is judged to be in a boosting initial stage, a frequency increasing signal is output to the oscillator, so that the oscillator increases the frequency of a clock signal according to the frequency increasing signal, the clock signal with the increased frequency is output to the charge pump, and the charge pump works under a high-frequency clock signal in the boosting initial stage; when the current bias voltage is greater than or equal to the preset voltage, the charge pump is judged to be in the later stage of boosting, a frequency reduction signal is output to the oscillator, so that the oscillator reduces the frequency of the clock signal to the normal working frequency according to the frequency increase signal, and the clock signal with the normal working frequency is output to the charge pump, so that the charge pump works under the clock signal with the normal working frequency.
Further, in order to improve the boosting efficiency of the charge pump, the operating state includes a power-on duration of the charge pump, and the outputting a corresponding frequency adjustment signal to the oscillator according to the operating state so that the oscillator adjusts the frequency of the clock signal output to the charge pump according to the frequency adjustment signal includes: acquiring the power-on time of the charge pump; when the power-on duration is less than a preset duration, outputting a frequency increasing signal to the oscillator so that the oscillator increases the frequency of a clock signal output to the charge pump according to the frequency increasing signal; and when the power-on duration is greater than or equal to a preset duration, outputting a frequency reduction signal to the oscillator so that the oscillator reduces the frequency of a clock signal output to the charge pump according to the frequency reduction signal.
In the specific implementation, the output voltage control device of the charge pump acquires the power-on time length of the charge pump, and when the power-on time length is smaller than the preset time length, the charge pump is judged to be in the initial stage of boosting, a frequency increasing signal is output to the oscillator, so that the oscillator increases the frequency of a clock signal according to the frequency increasing signal, and the clock signal with the increased frequency is output to the charge pump, so that the charge pump works under a high-frequency clock signal in the initial stage of boosting; when the power-on duration is greater than or equal to the preset duration, the charge pump is judged to be in the later stage of boosting, a frequency reduction signal is output to the oscillator, so that the oscillator reduces the frequency of the clock signal to the normal working frequency according to the frequency increase signal, the clock signal of the normal working frequency is output to the charge pump, and the charge pump works under the clock signal of the normal working frequency
In this embodiment, when the charge pump is powered on, the working state of the charge pump is monitored in real time; and outputting a corresponding frequency adjusting signal to the oscillator according to the working state, so that the oscillator adjusts the frequency of the clock signal output to the charge pump according to the frequency adjusting signal, the frequency of the clock signal can be adjusted according to the working state of the charge pump, and the dynamic power consumption of the charge pump is reduced while the boosting efficiency of the charge pump is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A charge pump output voltage control circuit, comprising: the device comprises a clock frequency adjusting module, an oscillator and a charge pump, wherein the clock frequency adjusting module is connected with the oscillator, and the oscillator is connected with the charge pump;
the clock frequency adjusting module is used for outputting a corresponding frequency adjusting signal to the oscillator according to the working state of the charge pump;
the oscillator is used for adjusting the frequency of a clock signal according to the frequency adjusting signal and outputting the clock signal with the adjusted frequency to the charge pump;
the charge pump is used for outputting bias voltage according to the received clock signal and the input voltage.
2. The charge pump output voltage control circuit of claim 1, wherein the clock frequency adjustment module is further configured to output a frequency adjustment signal to the oscillator based on a current bias voltage output by the charge pump.
3. The charge pump output voltage control circuit of claim 2, wherein the clock frequency adjustment module comprises a voltage detection unit;
the voltage detection unit is used for detecting the current bias voltage output by the charge pump and outputting a frequency increasing signal to the oscillator when the current bias voltage is smaller than a preset voltage;
the oscillator is further configured to increase the frequency of the clock signal according to the frequency increasing signal, and output the clock signal with the increased frequency to the charge pump.
4. The charge pump output voltage control circuit of claim 3, wherein the voltage detection unit is further configured to output a frequency reduction signal to the oscillator when the present bias voltage is greater than or equal to the preset voltage;
the oscillator is further configured to reduce the frequency of the clock signal according to the frequency reduction signal, and output the clock signal with the reduced frequency to the charge pump.
5. The charge pump output voltage control circuit of claim 1, wherein the clock frequency adjustment module is further configured to output a frequency adjustment signal to the oscillator according to a power-on duration of the charge pump.
6. The charge pump output voltage control circuit of claim 5, wherein the clock frequency adjustment module comprises a power-on reset unit;
the power-on reset unit is used for acquiring the power-on time length of the charge pump and outputting a frequency increasing signal to the oscillator when the power-on time length is less than a preset time length;
the power-on reset unit is further configured to output a frequency reduction signal to the oscillator when the power-on duration is greater than or equal to the preset duration.
7. The charge pump output voltage control circuit of any of claims 1-6, wherein the oscillator comprises MOS transistors, a capacitor, and N NOT gates, where N is an odd number greater than or equal to 3;
the grid of MOS pipe is the input of frequency control signal, the source electrode of MOS pipe with the first end of electric capacity is connected, the second end ground connection of electric capacity, the output and the input end-to-end of a N NOT gate, the drain electrode of MOS pipe is connected with the output of first NOT gate, the output of Nth NOT gate is clock signal's output.
8. A charge pump output voltage control method based on the charge pump output voltage control circuit according to any one of claims 1 to 7, characterized in that the charge pump output voltage control method comprises:
when the charge pump is electrified, monitoring the working state of the charge pump in real time;
and outputting a corresponding frequency adjusting signal to the oscillator according to the working state, so that the oscillator adjusts the frequency of the clock signal output to the charge pump according to the frequency adjusting signal.
9. The charge pump output voltage control method of claim 8, wherein the operating state comprises a present bias voltage of the charge pump output; the outputting a corresponding frequency adjusting signal to the oscillator according to the operating state so that the oscillator adjusts the frequency of the clock signal output to the charge pump according to the frequency adjusting signal includes:
detecting the current bias voltage output by the charge pump;
when the current bias voltage is smaller than a preset voltage, outputting a frequency increasing signal to the oscillator so that the oscillator increases the frequency of a clock signal output to the charge pump according to the frequency increasing signal;
and when the bias voltage is greater than or equal to a preset voltage, outputting a frequency reduction signal to the oscillator so as to reduce the frequency of a clock signal output to the charge pump according to the frequency reduction signal.
10. The method as claimed in claim 8, wherein the operating state includes a power-on duration of the charge pump, and the outputting a corresponding frequency adjustment signal to the oscillator according to the operating state to enable the oscillator to adjust a frequency of a clock signal output to the charge pump according to the frequency adjustment signal comprises:
acquiring the power-on time of the charge pump;
when the power-on duration is less than a preset duration, outputting a frequency increasing signal to the oscillator so that the oscillator increases the frequency of a clock signal output to the charge pump according to the frequency increasing signal;
and when the power-on duration is greater than or equal to a preset duration, outputting a frequency reduction signal to the oscillator so that the oscillator reduces the frequency of a clock signal output to the charge pump according to the frequency reduction signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210090939.6A CN114400889A (en) | 2022-01-25 | 2022-01-25 | Output voltage control circuit and method for charge pump |
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| CN202210090939.6A CN114400889A (en) | 2022-01-25 | 2022-01-25 | Output voltage control circuit and method for charge pump |
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| CN115985222A (en) * | 2023-03-21 | 2023-04-18 | 深圳通锐微电子技术有限公司 | Frequency control circuit, source driver, frequency control method and display panel |
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