CN111934541B - Charge pump voltage stabilizing circuit, voltage stabilizing method and nonvolatile memory - Google Patents
Charge pump voltage stabilizing circuit, voltage stabilizing method and nonvolatile memory Download PDFInfo
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- CN111934541B CN111934541B CN201910395045.6A CN201910395045A CN111934541B CN 111934541 B CN111934541 B CN 111934541B CN 201910395045 A CN201910395045 A CN 201910395045A CN 111934541 B CN111934541 B CN 111934541B
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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
Abstract
The invention discloses a charge pump voltage stabilizing circuit, a voltage stabilizing method and a nonvolatile memory, wherein the charge pump voltage stabilizing circuit comprises: the capacitance detection module is respectively connected with the first voltage stabilization module and the charge pump module and is used for detecting the output voltage of the charge pump module through the capacitance to generate a first feedback voltage and outputting the first feedback voltage to the first voltage stabilization module; the first voltage stabilizing module is connected with the charge pump module and used for comparing the first feedback voltage with the reference voltage and generating a first control signal according to a comparison result and outputting the first control signal to the charge pump module; and the charge pump module is used for controlling the working state of the charge pump module according to the first control signal so that the output voltage of the charge pump module fluctuates within a preset range. According to the technical scheme provided by the embodiment of the invention, the output voltage of the charge pump module is detected through the capacitor, the resistor string of the existing circuit is replaced, the power loss caused by detecting the output voltage in a resistor voltage division mode can be reduced, and the loss on the input power supply voltage is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of integrated circuits, in particular to a charge pump voltage stabilizing circuit, a voltage stabilizing method and a nonvolatile memory.
Background
The charge pump is a dc-dc converter, which uses a capacitor as an energy storage element to generate an output voltage higher than an input voltage or generate a negative output voltage. The instability of the output voltage affects the reliability of the charge pump, and therefore, the charge pump needs to stabilize the output voltage during operation.
Fig. 1 is a schematic structural diagram of a charge pump voltage stabilizing circuit commonly used in the prior art, and the working principle of the charge pump voltage stabilizing circuit in fig. 1 is as follows: the charge PUMP 101 generates an output voltage VOUT to supply energy to the load 103, and the output voltage VOUT is divided by a resistor R1 and a resistor R2 to generate a feedback voltage VFB, the feedback voltage VFB is compared with a reference voltage VREF by a comparator 102, a control signal PUMP _ EN is outputted and transmitted to an oscillator 104, the oscillator 104 generates a clock signal according to the control signal PUMP _ EN and transmits the clock signal to the charge PUMP 101 to drive the charge PUMP 101 to generate the output voltage VOUT. The capacitor C1 is used to keep the output voltage VOUT stable. Since the output voltage VOUT will have a small leakage current to the load 103, the output voltage VOUT will decrease due to the long-term leakage current. Therefore, the output voltage VOUT is detected by dividing the voltage by the resistor R1 and the resistor R2, when the output voltage VOUT decreases, the feedback voltage VFB decreases, the output voltage VFB is compared by the comparator 102, and the charge pump 101 is driven to operate to increase the output voltage VOUT, and the feedback voltage VFB also increases accordingly, and when the feedback voltage VFB is higher than the reference voltage VREF, the charge pump 101 is turned off, and the operation is cycled, so that the stable output voltage VOUT is obtained.
However, when the output voltage VOUT is detected by using a resistor-based voltage divider, the resistor-based series connection consumes current of the output voltage VOUT, thereby increasing the loss of the input power voltage.
Disclosure of Invention
The invention provides a charge pump voltage stabilizing circuit, a voltage stabilizing method and a nonvolatile memory, which are used for reducing power loss caused by detecting output voltage in a resistor voltage dividing mode and reducing loss on input power supply voltage.
In a first aspect, an embodiment of the present invention provides a charge pump voltage stabilizing circuit, including: the device comprises a capacitance detection module, a first voltage stabilizing module and a charge pump module; wherein the content of the first and second substances,
the capacitance detection module is respectively connected with the first voltage stabilization module and the charge pump module, and is used for detecting the output voltage of the charge pump module through a capacitor, generating a first feedback voltage and outputting the first feedback voltage to the first voltage stabilization module;
the first voltage stabilizing module is connected with the charge pump module and used for receiving the first feedback voltage, comparing the first feedback voltage with a reference voltage, and generating a first control signal according to a comparison result and outputting the first control signal to the charge pump module;
the charge pump module is used for controlling the working state of the charge pump module according to the first control signal, so that the output voltage of the charge pump module fluctuates within a preset range.
In a second aspect, an embodiment of the present invention further provides a voltage stabilizing method for a charge pump, including:
detecting the output voltage of the charge pump module through the capacitance detection module, generating a first feedback voltage and outputting the first feedback voltage to the first voltage stabilization module;
the first voltage stabilizing module receives the first feedback voltage, compares the first feedback voltage with a reference voltage, and generates a control signal according to a comparison result to output the control signal to the charge pump module;
the charge pump module controls the working state of the charge pump module according to the control signal output by the first voltage stabilizing module, so that the output voltage of the charge pump module fluctuates within a preset range.
In a third aspect, an embodiment of the present invention further provides a nonvolatile memory, where the nonvolatile memory includes the charge pump voltage stabilizing circuit as described in the first aspect. .
The embodiment of the invention provides a charge pump voltage stabilizing circuit, a voltage stabilizing method and a nonvolatile memory, wherein the charge pump voltage stabilizing circuit comprises: the capacitance detection module is respectively connected with the first voltage stabilization module and the charge pump module and is used for detecting the output voltage of the charge pump module through the capacitance to generate a first feedback voltage and outputting the first feedback voltage to the first voltage stabilization module; the first voltage stabilizing module is connected with the charge pump module and used for receiving the first feedback voltage, comparing the first feedback voltage with the reference voltage, and generating a first control signal according to a comparison result and outputting the first control signal to the charge pump module; and the charge pump module is used for controlling the working state of the charge pump module according to the first control signal so that the output voltage of the charge pump module fluctuates within a preset range. According to the technical scheme provided by the embodiment of the invention, the output voltage of the charge pump module is detected through the capacitor, the resistor string of the existing circuit is replaced, the power loss caused by detecting the output voltage in a resistor voltage division mode can be reduced, and the loss on the input power supply voltage is reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional charge pump voltage regulator circuit in the prior art;
FIG. 2 is a schematic diagram of a charge pump voltage regulator circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a topology of a charge pump voltage regulator circuit according to an embodiment of the invention;
fig. 4 is a flowchart of a voltage stabilizing method of a charge pump according to a second embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.
Example one
Fig. 2 is a schematic diagram of a charge pump voltage regulator circuit according to an embodiment of the present invention, which is applicable to a case of stabilizing an output voltage of a charge pump circuit, where the charge pump voltage regulator circuit is generally disposed in a nonvolatile memory.
As shown in fig. 2, the charge pump voltage stabilizing circuit provided in the embodiment of the present invention mainly includes the following components: a capacitance detection module 210, a first voltage stabilization module 220, and a charge pump module 230.
The capacitance detection module 210 is connected to the first voltage stabilization module 220 and the charge pump module 230, and configured to detect an output voltage of the charge pump module 230 through a capacitance, generate a first feedback voltage, and output the first feedback voltage to the first voltage stabilization module 220. The first voltage stabilizing module 220 is connected to the charge pump module 230, and configured to receive the first feedback voltage, compare the first feedback voltage with a reference voltage, and generate a first control signal according to a comparison result, and output the first control signal to the charge pump module 230. The charge pump module 230 is configured to control a working state of the charge pump module according to the first control signal, so that an output voltage of the charge pump module fluctuates within a preset range.
First, it should be noted that a non-volatile memory (nor Flash/nand Flash) is a common memory chip, and has the advantages of a random access memory and a read only memory, and data is not lost when power is lost, and is a memory capable of being electrically erased and written in a system. The Flash memory is composed of thousands of memory cells inside, each memory cell stores one bit of data, and the data storage operation is completed by applying corresponding voltages to the word lines of the memory cells, all the voltages being generated by a charge pump circuit.
In the present embodiment, the charge pump module 230 may be understood as a device that generates an output voltage higher than the input voltage, or generates a negative output voltage to the load 240, and provides a suitable power supply voltage for the load 240, in the present embodiment, the load 240 is preferably a word line of the memory cell. It should be noted that, in this embodiment, only the function of the charge pump module 230 is described, the topology and the device type of the charge pump module 230 are not limited, and a suitable charge pump circuit may be provided according to actual conditions. Further, the charge pump module 230 may be any one of a switching regulator boost pump, a non-regulation capacitive charge pump, and a regulation capacitive charge pump.
Further, in this embodiment, the voltage detection is performed by using the storage characteristic of the capacitor, that is, the change of the output voltage of the charge pump module is detected by using the principle that the voltage across the capacitor cannot change abruptly after the power is turned off.
Further, the first voltage stabilizing module 230 is specifically configured to generate a first control signal with a low level if the first feedback voltage is greater than the first reference voltage, and output the first control signal to the charge pump module; and if the first feedback voltage is smaller than the second reference voltage, generating a high-level first control signal and outputting the high-level first control signal to the charge pump module, wherein the first reference voltage is larger than the second reference voltage.
Further, the charge pump module 230 is specifically configured to control the charge pump module to be in a working state if the first control signal is a high level signal, so that the output voltage of the charge pump module is increased; and if the control signal is a low level signal, controlling the charge pump module to be in a closed state, so that the output voltage of the charge pump module is reduced.
In the present embodiment, when the voltage provided by the charge pump module 230 to the load 240 rises to the first reference voltage, the output voltage of the charge pump module 230 needs to be lowered to achieve the stabilization of the output voltage of the charge pump module 230. When the voltage provided by the charge pump module 230 to the load 240 decreases to the second reference voltage, the output voltage of the charge pump module 230 needs to be increased to stabilize the output voltage of the charge pump module 230.
In this embodiment, the capacitance detecting module 210 outputs the detected first feedback voltage to the first voltage stabilizing module 220, and the first voltage stabilizing module 220 compares the first feedback voltage with a first reference voltage, and generates a first control signal with a low level if the first feedback voltage is greater than the first reference voltage, and outputs the first control signal to the charge pump module 230. After receiving the first control signal of the low level, the charge pump module 230 stops operating, so that the output voltage is reduced. The first voltage stabilization module 220 compares the first feedback voltage with the second reference voltage, and generates a first control signal of a high level if the first feedback voltage is less than the second reference voltage, and outputs the first control signal to the charge pump module 230. After receiving the first control signal with high level, the charge pump module 230 starts to operate, so that the output voltage rises. The above process is repeatedly performed, so that the output voltage of the charge pump module 230 fluctuates within a preset range, and the effect of stabilizing the output voltage is achieved.
The embodiment of the invention provides a charge pump voltage stabilizing circuit, which comprises: the capacitance detection module is respectively connected with the first voltage stabilization module and the charge pump module and is used for detecting the output voltage of the charge pump module through the capacitance to generate a first feedback voltage and outputting the first feedback voltage to the first voltage stabilization module; the first voltage stabilizing module is connected with the charge pump module and used for receiving the first feedback voltage, comparing the first feedback voltage with the reference voltage, and generating a control signal according to a comparison result and outputting the control signal to the charge pump module; and the charge pump module is used for controlling the working state of the charge pump module according to the control signal output by the first voltage stabilizing module, so that the output voltage of the charge pump module fluctuates within a preset range. According to the technical scheme provided by the embodiment of the invention, the output voltage of the charge pump module is detected through the capacitor, the resistor string of the existing circuit is replaced, the power loss caused by detecting the output voltage in a resistor voltage division mode can be reduced, and the loss on the input power supply voltage is reduced.
FIG. 3 is a schematic diagram of a topology of a charge pump voltage regulator circuit according to an embodiment of the invention. As shown in fig. 3, the first voltage stabilizing module 220 is a hysteresis comparator COMP1, a first input terminal of the hysteresis comparator COMP1 is connected to a first power supply module (not shown), a second input terminal of the hysteresis comparator COMP1 is connected to the capacitance detection module 210, a third input terminal of the hysteresis comparator COMP1 is connected to a second power supply module (not shown), and a first output terminal of the hysteresis comparator COMP1 is connected to the charge pump module 230; the first power supply module is used for providing a first reference voltage V1; and the second power supply module is used for providing a second reference voltage V2.
Further, the charge pump voltage stabilizing circuit further comprises: the resistance detection module 260 is connected to the charge pump module 230 through the switch module 250, and is configured to detect an output voltage of the charge pump module 230 when the switch module 250 is closed, generate a second feedback voltage, and output the second feedback voltage to the second voltage stabilization module 270; and the second voltage stabilizing module 270 is connected to the charge pump module, and configured to generate a second control signal if the second feedback voltage is greater than the third reference voltage, and output the second control signal to the switch module 270 and the charge pump module, so that the switch module 250 is turned off, and the charge pump module 230 is controlled to be in an off state.
Further, the method also comprises the following steps: the input end of the inverter 280 is connected with the second voltage stabilizing module, and the output end of the inverter is connected with the first voltage stabilizing module; the inverter 280 is configured to receive the second control signal and invert the second control signal to obtain a first trigger signal PUMP _ ENB, so as to trigger the first voltage stabilizing module to start.
Specifically, the switch module 250 includes: a first switch S1 and a second switch S2, wherein a first terminal of the first switch S1 is connected to the charge pump module 230, a second terminal of the first switch S1 is connected to the resistance detection module 260, and a third terminal of the first switch S1 is connected to the second voltage stabilization module 270; a first terminal of the second switch S2 is connected to the capacitance detecting module 210, a second terminal of the second switch S2 is connected to the first power module, and a third terminal of the first switch S2 is connected to the second voltage stabilizing module 270.
Further, the charge pump module 230 includes: an or gate 231, an oscillator 232 and a charge pump 233, wherein a first input terminal of the or gate 231 is connected to the first voltage stabilizing module, a second input terminal of the or gate 231 is connected to the second voltage stabilizing module 220, and an output terminal of the or gate 231 is connected to an input terminal of the oscillator 232; the output of the oscillator 232 is connected to a charge pump 233.
In the present embodiment, the resistance detection module 260 includes a first resistor R1 and a second resistor R2, and the second voltage stabilization module 270 is preferably a first comparator COMP 2. One end of the first resistor R1 is connected to the output end of the charge pump 230 through the first switch S1, the other end of the first resistor R1 is connected to one end of the second resistor R2 and the negative end of the first comparator COMP2, and the other end of the second resistor R2 is grounded. The positive terminal of the first comparator COMP2 inputs a third reference voltage. An output terminal of the first comparator COMP2 is connected to a first input terminal of the or gate 231. The first resistor R1 and the second resistor R2 detect the output voltage VOUT of the charge pump 230 by the voltage division principle, and generate the second feedback voltage VFB. The output terminal of the first comparator COMP2 is also connected to the control terminal of the first comparator COMP 2.
In this embodiment, the capacitance detecting module 210 is preferably a first capacitor C1, one end of the first capacitor C1 is connected to the output terminal of the charge pump 230, and the other end of the first capacitor C1 is connected to the first power module through a second switch S2, i.e., is connected to the first reference voltage V1. The other end of the first capacitor C1 is connected to the negative terminal of the hysteresis comparator COMP1, and the first positive terminal of the hysteresis comparator COMP1 is connected to the first power module, i.e. connected to the first reference voltage V1. A second positive terminal of the hysteresis comparison COMP1 is connected to the second power module, i.e. connected to the second reference voltage V2. An output terminal of the hysteresis comparator COMP1 is connected to a second input terminal of the or gate 231. An output terminal of the first comparator COMP2 is connected to a control terminal of the hysteresis comparator COMP1 through an inverter 280.
Before the charge pump system is powered up, the first switch S1 and the second switch S2 are in an open state. After the charge pump system is powered on, since it takes a certain time for the output voltage VOUT of the charge pump 230 to rise, the initial voltage of the second feedback voltage VFB is lower than the third reference voltage VREF. Since the second feedback voltage VFB is lower than the third reference voltage VREF, the second control signal PUMP _ EN output by the first comparator COMP2 is a high-level signal.
When the second control signal PUMP _ EN is a high-level signal, the first switch S1 and the second switch S2 are controlled to be closed, and at this time, the lower plate of the first capacitor C1 is connected to the first power module, so that the potential of the lower plate of the first capacitor C1 reaches the first reference voltage V1. When the second control signal PUMP _ EN is a high signal, the first trigger signal PUMP _ ENB generated by the inverter 280 is a low signal to control the hysteretic comparator COMP1 to turn off. The high level of the second control signal PUMP _ EN is passed through the or gate circuit to generate a high level signal to trigger the oscillator 232 to start operating, and further to drive the charge PUMP 233 to start, so that the output voltage VOUT starts to rise.
As the output voltage VOUT increases, the second feedback voltage VFB increases accordingly. The output voltage VOUT satisfies the following equation: when VOUT becomes (VREF × (R1+ R2)/R2), the second feedback voltage VFB rises to be equal to the third reference voltage VREF. The second control signal PUMP _ EN output by the first comparator COMP2 is a low level signal. When the second control signal PUMP _ EN is a low level signal, the first switch S1 and the second switch S2 are controlled to be turned off. Meanwhile, a low level signal is input to the control terminal of the first comparator COMP2, and the first comparator COMP2 is turned off and stops working.
Since the second control signal PUMP _ EN is a low level signal, and the first control signal PUMP _ EN1 is a low level signal. The second control signal PUMP _ EN and the first control signal PUMP _ EN1 generate a low level signal through the or gate 231 to trigger the oscillator 232 to stop operating, so that the driving charge PUMP 233 stops operating. The output voltage VOUT begins to decrease due to leakage current of the output voltage VOUT into the load 240.
After the second switch S2 is turned off, the lower plate of the first capacitor C1 is disconnected from the first power module, and the first feedback voltage Vd on the lower plate of the first capacitor C1 starts to detect the change of the output voltage VOUT through the first capacitor C1. The first feedback voltage Vd starts to drop from the first reference voltage V1. When the first feedback voltage Vd drops to be equal to the second reference voltage V2, the first control signal PUMP _ EN1 output by the hysteresis comparator COMP1 is a high level signal. At this time, the output voltage VOUT satisfies the following formula: VOUT ═ VREF × (R1+ R2)/R2-V1+ V2. When the first control signal PUMP _ EN1 is a high level signal, the or gate 231 generates a high level signal to trigger the oscillator 232 to start operating, and further drives the charge PUMP 233 to start, so that the output voltage VOUT starts to rise.
As the output voltage VOUT increases, the first feedback voltage Vd increases accordingly. When the first feedback voltage Vd rises to be equal to the first reference voltage V1, the first control signal PUMP _ EN1 output by the hysteresis comparator COMP1 is a low level signal, and the second control signal PUMP _ EN and the first control signal PUMP _ EN1 pass through the or gate circuit 231 to generate a low level signal, thereby triggering the oscillator to stop working, and further stopping the driving charge PUMP 233 from working. The output voltage VOUT begins to decrease due to leakage current of the output voltage VOUT into the load 240.
When the first feedback voltage Vd drops to the second reference voltage V2, the first control signal PUMP _ EN1 is a high level signal, and the high level signal is generated through the or gate 231 to trigger the oscillator 232 to start operating, so as to drive the charge PUMP 233 to start operating, so that the output voltage VOUT starts to rise. When the first feedback voltage Vd increases to the first reference voltage V1, the first control signal PUMP _ EN1 is a low level signal, which is generated through the or gate 231 to trigger the oscillator 232 to stop working, so that the driving charge PUMP 233 stops working, and the output voltage VOUT starts to decrease. By doing so, the stability of the output voltage VOUT is maintained, and the first feedback voltage Vd varies back and forth between the first reference voltage V1 and the second reference voltage V2, i.e., the output voltage VOUT varies between (VREF × (R1+ R2)/R2) and (VREF × (R1+ R2)/R2-V1+ V2), and the ripple amplitude of the output voltage VOUT is (V1-V2).
It should be noted that the difference between the first reference voltage V1 and the second reference voltage V2 determines the ripple magnitude of the output voltage VOUT, and the values of the first reference voltage V1 and the second reference voltage V2 can be designed according to practical applications.
In the present embodiment, the first capacitor C1 is used to detect the change in the output voltage VOUT, and the detection circuit does not consume current on the output voltage VOUT. After the output voltage VOUT stabilizes, the first switch S1 is turned off, and the first comparator COMP2 is turned off, i.e., neither the resistor string nor the first comparator COMP2 consumes power. In addition, the hysteresis comparator COMP1 is used instead of the normal comparator to prevent the first control signal PUMP _ EN1 from continuously inverting between the high level and the low level, so as to drive the charge PUMP 233 to operate all the time, thereby wasting power consumption.
In the conventional charge pump system, a resistor is used to divide voltage to detect an output voltage, a resistor string always consumes current on the output voltage VOUT, the output voltage VOUT is a high voltage generated by the charge pump 233, the higher the voltage of the output voltage VOUT is, the lower the current efficiency η of the charge pump system is, the higher the power consumption i _ R1/η of the current i _ R1 consumed on the resistor string converted to an input power voltage is, in some application cases, η is only 10%, that is, the current consumed on the power voltage is 10 times that of i _ R1. According to the technical scheme provided by the embodiment, the output voltage is detected by adopting the capacitor, the output voltage is prevented from being detected by dividing voltage by using a resistor, and compared with the conventional charge pump system, the power consumption of the power supply voltage is saved by i _ R1/eta.
On the basis of the above embodiments, an embodiment of the present invention further provides a nonvolatile memory, which includes the charge pump voltage regulator circuit as described in any of the above embodiments.
The nonvolatile memory provided by the embodiment of the invention can comprise the charge pump voltage stabilizing circuit provided by any embodiment of the invention, and has the corresponding functional module and the beneficial effect of executing the charge pump voltage stabilizing circuit.
Example two
Fig. 4 is a flowchart of a voltage stabilizing method of a charge pump according to a second embodiment of the present invention, which is applicable to the case of stabilizing the output voltage of a charge pump circuit, and the voltage stabilizing method of the charge pump is performed by the voltage stabilizing circuit of the charge pump according to the second embodiment of the present invention, and is generally configured in a nonvolatile memory.
As shown in fig. 4, the method for stabilizing voltage of a charge pump according to the embodiment of the present invention mainly includes the following steps:
s410, detecting the output voltage of the charge pump module through the capacitance detection module, generating a first feedback voltage and outputting the first feedback voltage to the first voltage stabilization module;
s420, the first voltage stabilizing module receives the first feedback voltage, compares the first feedback voltage with a reference voltage, and generates a first control signal according to a comparison result to output to the charge pump module;
and S430, the charge pump module controls the working state of the charge pump module according to the first control signal, so that the output voltage of the charge pump module fluctuates within a preset range.
The embodiment of the invention provides a voltage stabilizing method of a charge pump, which comprises the steps of detecting the output voltage of a charge pump module through a capacitance detection module, generating a first feedback voltage and outputting the first feedback voltage to a first voltage stabilizing module; the first voltage stabilizing module receives the first feedback voltage, compares the first feedback voltage with a reference voltage, and generates a first control signal according to a comparison result to output the first control signal to the charge pump module; the charge pump module controls the working state of the charge pump module according to the first control signal, so that the output voltage of the charge pump module fluctuates within a preset range. According to the technical scheme provided by the embodiment of the invention, the output voltage of the charge pump module is detected through the capacitor, the resistor string of the existing circuit is replaced, the power loss caused by detecting the output voltage in a resistor voltage division mode can be reduced, and the loss on the input power supply voltage is reduced.
Further, generating a first control signal according to the comparison result and outputting the first control signal to the charge pump module includes:
if the first feedback voltage is greater than the first reference voltage, generating a first control signal with a low level and outputting the first control signal to the charge pump module;
and if the first feedback voltage is smaller than a second reference voltage, generating a high-level first control signal and outputting the high-level first control signal to the charge pump module, wherein the first reference voltage is larger than the second reference voltage.
Further, the controlling the working state of the charge pump module according to the first control signal by the charge pump module includes:
if the first control signal is a high level signal, controlling the charge pump module to be in a working state, so that the output voltage of the charge pump module is increased;
and if the first control signal is a low level signal, controlling the charge pump module to be in a closed state, so that the output voltage of the charge pump module is reduced.
Further, the first voltage stabilizing module is a hysteresis comparator, a first input end of the hysteresis comparator is connected with the first power module, a second input end of the hysteresis comparator is connected with the capacitance detection module, a third input end of the hysteresis comparator is connected with the second power module, and a first output end of the hysteresis comparator is connected with the charge pump module; the first power supply module provides a first reference voltage; the second power module provides a second reference voltage.
Further, the method further comprises:
when the switch module is closed, the resistance detection module detects the output voltage of the charge pump module, generates a second feedback voltage and outputs the second feedback voltage to the second voltage stabilization module;
and if the second feedback voltage is greater than a third reference voltage, the second voltage stabilizing module generates a second control signal and outputs the second control signal to the switch module and the charge pump module, so that the switch module is switched off and the charge pump module is controlled to be in a closed state.
Further, the method further comprises: the phase inverter receives the second control signal and inverts the second control signal to obtain a first trigger signal so as to trigger the first voltage stabilizing module to start.
Further, the switch module includes: a first switch and a second switch, wherein,
the first end of the first switch is connected with the charge pump module, the second end of the first switch is connected with the resistance detection module, and the third end of the first switch is connected with the second voltage stabilization module;
the first end of the second switch is connected with the capacitance detection module, the second end of the second switch is connected with the first power supply module, and the third end of the first switch is connected with the second voltage stabilization module.
Further, the charge pump module includes: or gates, oscillators, and charge pumps, wherein,
the first input end of the OR gate circuit is connected with the first voltage stabilizing module, the second input end of the OR gate circuit is connected with the second voltage stabilizing module, and the output end of the OR gate circuit is connected with the input end of the oscillator;
the output end of the oscillator is connected with the charge pump.
The voltage stabilizing method of the charge pump provided by the embodiment of the invention is executed by the voltage stabilizing circuit of the charge pump provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the voltage stabilizing circuit of the charge pump.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A charge pump voltage regulator circuit, comprising: the device comprises a capacitance detection module, a first voltage stabilizing module and a charge pump module; wherein the content of the first and second substances,
the capacitance detection module is respectively connected with the first voltage stabilization module and the charge pump module, and is used for detecting the output voltage of the charge pump module through a capacitor, generating a first feedback voltage and outputting the first feedback voltage to the first voltage stabilization module;
the first voltage stabilizing module is connected with the charge pump module and used for receiving the first feedback voltage, comparing the first feedback voltage with a reference voltage, and generating a first control signal according to a comparison result and outputting the first control signal to the charge pump module;
the charge pump module is used for controlling the working state of the charge pump module according to the first control signal, so that the output voltage of the charge pump module fluctuates within a preset range;
the first voltage stabilizing module is a hysteresis comparator, a first input end of the hysteresis comparator is connected with the first power supply module, a second input end of the hysteresis comparator is connected with the capacitance detection module, a third input end of the hysteresis comparator is connected with the second power supply module, and a first output end of the hysteresis comparator is connected with the charge pump module; wherein the content of the first and second substances,
the first power supply module is used for providing a first reference voltage;
the second power supply module is used for providing a second reference voltage;
the charge pump voltage stabilizing circuit further comprises: a resistance detection module and a second voltage stabilization module, wherein,
the resistance detection module is connected with the charge pump module through a switch module, and is used for detecting the output voltage of the charge pump module when the switch module is closed, generating a second feedback voltage and outputting the second feedback voltage to the second voltage stabilization module;
the second voltage stabilizing module is connected with the charge pump module and is used for generating a second control signal and outputting the second control signal to the switch module and the charge pump module if the second feedback voltage is greater than a third reference voltage, so that the switch module is switched off and the charge pump module is controlled to be in a closed state.
2. The charge pump voltage regulator circuit of claim 1, wherein the first voltage regulator module is specifically configured to generate a first control signal at a low level and output the first control signal to the charge pump module if the first feedback voltage is greater than a first reference voltage; and if the first feedback voltage is smaller than a second reference voltage, generating a high-level first control signal and outputting the high-level first control signal to the charge pump module, wherein the first reference voltage is larger than the second reference voltage.
3. The charge pump voltage stabilizing circuit of claim 2, wherein the charge pump module is specifically configured to control the charge pump module to be in an operating state if the first control signal is a high level signal, so that the output voltage of the charge pump module is increased; and if the first control signal is a low level signal, controlling the charge pump module to be in a closed state, so that the output voltage of the charge pump module is reduced.
4. The charge pump voltage regulation circuit of claim 1, further comprising: an inverter, wherein,
the input end of the phase inverter is connected with the second voltage stabilizing module, and the output end of the phase inverter is connected with the first voltage stabilizing module;
the inverter is used for receiving the second control signal and inverting the second control signal to obtain a first trigger signal so as to trigger the first voltage stabilizing module to start.
5. The charge pump voltage regulation circuit of claim 1, wherein the switch module comprises: a first switch and a second switch, wherein,
the first end of the first switch is connected with the charge pump module, the second end of the first switch is connected with the resistance detection module, and the third end of the first switch is connected with the second voltage stabilization module;
the first end of the second switch is connected with the capacitance detection module, the second end of the second switch is connected with the first power supply module, and the third end of the second switch is connected with the second voltage stabilization module.
6. The charge pump voltage regulation circuit of claim 4, wherein the charge pump module comprises: or gates, oscillators, and charge pumps, wherein,
the first input end of the OR gate circuit is connected with the first voltage stabilizing module, the second input end of the OR gate circuit is connected with the second voltage stabilizing module, and the output end of the OR gate circuit is connected with the input end of the oscillator;
the output end of the oscillator is connected with the charge pump.
7. A method for stabilizing voltage of a charge pump, comprising:
detecting the output voltage of the charge pump module through the capacitance detection module, generating a first feedback voltage and outputting the first feedback voltage to the first voltage stabilization module;
the first voltage stabilizing module receives the first feedback voltage, compares the first feedback voltage with a reference voltage, and generates a first control signal according to a comparison result to output the first control signal to the charge pump module;
the charge pump module controls the working state of the charge pump module according to the first control signal, so that the output voltage of the charge pump module fluctuates within a preset range;
the first voltage stabilizing module is a hysteresis comparator, a first input end of the hysteresis comparator is connected with the first power supply module, a second input end of the hysteresis comparator is connected with the capacitance detection module, a third input end of the hysteresis comparator is connected with the second power supply module, and a first output end of the hysteresis comparator is connected with the charge pump module; the first power supply module provides a first reference voltage; the second power supply module provides a second reference voltage;
the method further comprises the following steps:
when the switch module is closed, the resistance detection module detects the output voltage of the charge pump module, generates a second feedback voltage and outputs the second feedback voltage to the second voltage stabilization module;
if the second feedback voltage is greater than a third reference voltage, the second voltage stabilization module generates a second control signal and outputs the second control signal to the switch module and the charge pump module, so that the switch module is switched off and the charge pump module is controlled to be in a closed state;
the method for stabilizing the charge pump uses the charge pump voltage stabilizing circuit as claimed in claim 1.
8. A non-volatile memory comprising the charge pump voltage regulation circuit of any one of claims 1 to 6.
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| CN113643652B (en) * | 2021-08-05 | 2022-10-14 | 深圳市合科泰电子有限公司 | Drive chip with built-in charge pump |
| CN117411320B (en) * | 2023-12-15 | 2024-02-27 | 北京七星华创微电子有限责任公司 | Voltage stabilizing circuit |
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Address after: Room 101, Floor 1-5, Building 8, Yard 9, Fenghao East Road, Haidian District, Beijing 100094 Patentee after: Zhaoyi Innovation Technology Group Co.,Ltd. Patentee after: HEFEI GEYI INTEGRATED CIRCUIT Co.,Ltd. Address before: 100083 12 Floors, Block A, Tiangong Building, Science and Technology University, 30 College Road, Haidian District, Beijing Patentee before: GIGADEVICE SEMICONDUCTOR(BEIJING) Inc. Patentee before: HEFEI GEYI INTEGRATED CIRCUIT Co.,Ltd. |