Power management circuit, chip and electronic voltage stabilizing equipment

Abstract

The invention discloses a power management circuit, a chip and electronic voltage stabilizing equipment. The power management circuit comprises a voltage stabilizer, a first comparator and a voltage control unit, the first comparator is connected with the voltage control unit, and the voltage control unit is connected with the voltage stabilizer; the first comparator is used for comparing externally input voltage to be processed with pre-configured first reference voltage; the voltage control unit is connected with the first capacitor; the common connection end of the voltage control unit and the voltage stabilizer is used for connecting a second capacitor; the voltage control unit is used for opening a charging path between the first capacitor and the second capacitor according to a comparison result of the first comparator so as to transfer charges by using the first capacitor, and the first capacitor and the second capacitor supply power to the voltage stabilizer; under the condition that the absolute value of the voltage difference between the voltage input end and the voltage output end of the voltage stabilizer is reduced, the input voltage is processed into the voltage stabilizing working voltage.

Description

Technical Field

[0001] The present application relates to the technical field of power supply circuits, and in particular to power supply management circuits, chips and electronic voltage stabilization equipment. Background Art

[0002] The step-down module in the chip is either a DC-DC converter or a linear regulator. The DC-DC converter requires an inductor, which not only takes up a lot of space, but also has a cost problem.

[0003] The Chinese invention patent with patent application number CN202410226629.1 discloses a motor control system, which uses a boost-buck controller to charge the battery and distribute the power supply current to the motor by controlling two switch tubes when the charging device is detected to be inserted and a request to enter the drive working mode is received; it can also step down or boost the voltage at the system voltage node by controlling the two switch tubes when the charging device is detected to be inserted and a charging instruction signal is received, or when the charging device is not detected to be inserted and a request to enter the drive working mode is received, including combining the inductor to use the internal switch logic circuit to control the duty cycle of the voltage and other parameters generated at the system voltage pin, and play the role of stepping down and charging the battery under the corresponding step-down logic formed by the Buck drive circuit, or play the role of stepping up and driving the motor under the corresponding step-up logic formed by the Boost drive circuit. Among them, the boost-buck controller can be switched to a Boost drive circuit responsible for step-up or a Buck drive circuit responsible for step-down.

[0004] The motor control system disclosed in the Chinese invention patent with patent application number CN202410226629.1 discloses that the connection node between the capacitor and the positive electrode of the battery is connected to the boost-buck controller through an inductor to form a power supply path, which is regarded as a charging and discharging path formed between the connection node of the two switching tubes and the battery. Since the inductor plays the role of energy storage, the inductor is combined to solve the problems of switch charging and boosting. In the above-mentioned Chinese invention patent, although the boost-buck controller acting as a linear regulator is indirectly connected to an external charging device through a switching tube to receive a reference charging voltage to form a charging path, charging through capacitor coupling of each switching tube still requires the participation of the inductor, which will increase the volume and manufacturing cost. Moreover, when the voltage difference between the input end and the output end of the regulator is too high, it will cause severe heat and reduce the power conversion efficiency of the regulator. Summary of the invention

[0005] This application discloses a power management circuit, a chip and an electronic voltage stabilization device. The specific technical solutions are as follows A power management circuit, the power management circuit includes a voltage stabilizer, a first comparator and a voltage control unit; the first comparator is connected to the voltage control unit, and the voltage control unit is connected to the voltage stabilizer; the first comparator is used to compare the external input voltage to be processed and the pre-configured first reference voltage; the voltage control unit is used to connect the first capacitor; the common connection end of the voltage control unit and the voltage stabilizer is used to connect the second capacitor; the voltage control unit is used to open the charging path between the first capacitor and the second capacitor according to the comparison result of the first comparator to use the first capacitor for charge transfer, and the first capacitor and the second capacitor are used to power the voltage stabilizer, so that the voltage stabilizer processes the input voltage into a regulated working voltage while reducing the absolute value of the voltage difference between its voltage input terminal and voltage output terminal; wherein the voltage of the common connection end is used to feed back the voltage of the second capacitor to the voltage stabilizer.

[0006] In summary, the technical effect of the power management circuit disclosed in the present application is that a single capacitor is used and connected to a voltage control unit to perform charge transfer when the input voltage of the voltage regulator does not meet the voltage regulation input requirements. Compared with the method of directly inputting the voltage to be processed, the input voltage of the voltage regulator is reduced by charge transfer; thereby, a power supply path with strong adaptability is set for the voltage regulator according to the different external input voltages, which is not affected by the high voltage difference between the input and output of the voltage regulator and improves the power conversion efficiency, and can also stop using the capacitor for charge transfer according to the input voltage of the voltage regulator to reduce power consumption, and has good applicability to the voltage environment; overall, a low-cost circuit assembly design is achieved.

[0007] Furthermore, the voltage control unit is used to control the voltage to be processed to charge the first capacitor when the first comparator compares and obtains that the voltage to be processed is greater than the first reference voltage, and at the same time drives the charge stored in the first capacitor to be transferred to the second capacitor to charge the second capacitor until the voltage at the common connection terminal meets the power consumption reduction requirement of the voltage regulator, so as to reduce the absolute value of the voltage difference between the voltage at the common connection terminal and the voltage stabilization working voltage, wherein the voltage at the common connection terminal is the voltage at the voltage input terminal of the voltage regulator, and the voltage stabilization working voltage is the voltage at the voltage output terminal of the voltage regulator. Therefore, on the basis of maintaining the first capacitor and the second capacitor as the path for power supply to the voltage regulator, the voltage at the signal output terminal of the voltage control unit meets the power consumption reduction requirement of the voltage regulator, ensuring that the voltage difference between the input and output of the voltage regulator is not too high, thereby improving the power conversion efficiency.

[0008] Furthermore, the voltage control unit is also used to control the voltage to be processed to be transmitted to the voltage regulator without passing through the first capacitor when the first comparator compares and obtains that the voltage to be processed is less than the first reference voltage, so that the voltage to be processed does not charge the first capacitor. Therefore, based on the comparison result of the first comparator, the voltage control unit detects that the voltage to be processed is relatively small and close to the stable working voltage, does not open the first capacitor for charge transfer (equivalent to not using a charge pump), and directly uses the voltage to be processed as the input voltage of the voltage regulator, thereby ensuring the power supply voltage conversion efficiency, preventing the absolute value of the voltage difference between the voltage output terminal of the voltage regulator and the voltage input terminal of the voltage regulator from exceeding the absolute value of the voltage difference between the first reference voltage and the regulated working voltage, and does not cause excessive loss to the power supply voltage conversion efficiency.

[0009] Furthermore, the power management circuit also includes a second comparator; the second comparator is connected to the voltage control unit, and the second comparator is connected to the voltage regulator; the common connection end of the voltage control unit, the second comparator and the voltage regulator is used to connect the second capacitor; the second comparator is used to compare the voltage of the common connection end with the pre-configured second reference voltage; the voltage control unit is also used to open the charging path between the first capacitor and the second capacitor according to the comparison results of the first comparator and the comparison results of the second comparator to use the first capacitor for charge transfer. Thereby meeting the power consumption reduction requirements of the voltage regulator and ensuring the stable and efficient output voltage of the voltage regulator.

[0010] Furthermore, the voltage control unit is used to control the voltage to be processed to charge the first capacitor when the first comparator compares and obtains that the voltage to be processed is greater than the first reference voltage, and the second comparator compares and obtains that the voltage at the common connection terminal is less than the second reference voltage, and at the same time, the charge stored in the first capacitor is transferred to the second capacitor to charge the second capacitor until the voltage at the common connection terminal meets the power consumption reduction requirement of the voltage regulator, so as to reduce the absolute value of the voltage difference between the voltage input terminal and the voltage output terminal of the voltage regulator, and keep the first capacitor and the second capacitor to supply power to the voltage regulator. The voltage at the signal output terminal of the voltage control unit meets the power consumption reduction requirement of the voltage regulator, ensures that the voltage difference between the input and output of the voltage regulator is not too high, and improves the power conversion efficiency.

[0011] Furthermore, the voltage control unit is also used to shut off the charging path between the first capacitor and the second capacitor to stop the first capacitor from transferring charge when the voltage of the common connection terminal is greater than the second reference voltage as compared by the second comparator; wherein, when the voltage of the common connection terminal is greater than the second reference voltage, the voltage of the common connection terminal meets the power consumption reduction requirement of the voltage regulator, so that the voltage regulator steps down the voltage of the common connection terminal to the voltage stabilization working voltage. In this way, the first capacitor can be controlled to stop the charge transfer when the voltage of the common connection terminal is greater than the second reference voltage in combination with the comparison result of the second comparator, so as to prevent the absolute value of the voltage difference between the voltage output terminal of the voltage regulator and the voltage input terminal of the voltage regulator from exceeding the absolute value of the voltage difference between the second reference voltage and the voltage stabilization working voltage, thereby reducing the power consumption of the voltage regulator at low current.

[0012] Further, the voltage control unit is provided with a signal input terminal, a first feedback input terminal, a second feedback input terminal, a signal output terminal, a first transmission terminal and a second transmission terminal; the signal input terminal of the voltage control unit is used to input the voltage to be processed; the first feedback input terminal of the voltage control unit is connected to the output terminal of the first comparator, the positive input terminal of the first comparator is used to input the voltage to be processed, and the negative input terminal of the first comparator is used to input the first reference voltage; the first transmission terminal of the voltage control unit and the second transmission terminal of the voltage control unit are respectively connected to the two ends of the first capacitor, and the signal output terminal of the voltage control unit is the common connection terminal; the signal output terminal of the voltage control unit is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; the second feedback input terminal of the voltage control unit is connected to the output terminal of the second comparator, the positive input terminal of the second comparator is connected to the signal output terminal of the voltage control unit, and the negative input terminal of the second comparator is used to input the second reference voltage. Therefore, according to the comparison result of the first comparator and the comparison result of the second comparator, the first capacitor is selected to start charge transfer to the second capacitor. Compared with directly configuring the voltage to be processed as the input voltage of the regulator, the first capacitor is used to perform charge transfer to reduce the voltage difference between the input voltage of the regulator and the stable working voltage, thereby improving the power conversion efficiency of the regulator and being beneficial to controlling the power consumption of the circuit.

[0013] Further, the voltage control unit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; the control end of the first switch tube, the control end of the second switch tube, the control end of the third switch tube and the control end of the fourth switch tube are simultaneously controlled by the comparison result of the first comparator and the comparison result of the second comparator; wherein, the charging path between the first capacitor and the second capacitor is a circuit path formed by connecting the first switch tube, the first capacitor, the fourth switch tube and the second capacitor in sequence when the first switch tube is turned on and the fourth switch tube is turned on, and the second switch tube is turned off and the third switch tube is turned off; wherein, the path for the first capacitor and the second capacitor to supply power to the regulator is a circuit path formed by connecting the second switch tube, the first capacitor, the third switch tube and the second capacitor when the first switch tube is turned off and the fourth switch tube is turned off, and the second switch tube is turned on and the third switch tube is turned on, providing the regulator with an input signal that meets the power consumption reduction requirement.

[0014] Furthermore, the path for transmitting the voltage to be processed to the voltage regulator without passing through the first capacitor is a circuit path formed by connecting the first switch tube, the third switch tube and the voltage regulator when the first switch tube is turned on and the third switch tube is turned on, and the second switch tube and the fourth switch tube are turned off. The path for transmitting the voltage to be processed to the voltage regulator without passing through the first capacitor is opened, so that the voltage to be processed bypasses the charge and discharge path where the first capacitor is located, and the voltage to be processed is directly transmitted to the common connection terminal, and then the voltage to be processed is directly given to the voltage input terminal of the voltage regulator.

[0015] Further, in the voltage control unit, the first transmission end of the first switch tube is used to input the voltage to be processed, the first transmission end of the third switch tube and the second transmission end of the first switch tube are connected to one end of the first capacitor, the first transmission end of the second switch tube and the first transmission end of the fourth switch tube are connected to the other end of the first capacitor, the second transmission end of the second switch tube is grounded, and the second transmission end of the fourth switch tube and the second transmission end of the third switch tube are connected to the common connection end; wherein, the first transmission end of the first switch tube is connected to the signal input end of the voltage control unit, one end of the first capacitor is connected to the first transmission end of the voltage control unit, and the other end of the first capacitor is connected to the second transmission end of the voltage control unit. In summary, the power management circuit disclosed in the present application couples the first capacitor between multiple groups of switch tubes, drives each switch tube to charge or pass the capacitor according to the comparison results of each comparator, provides a suitable input voltage for the voltage regulator, and improves the power conversion efficiency.

[0016] A chip, wherein the power management circuit is arranged inside the chip. In combination with the power management circuit disclosed in the aforementioned technical solution, the chip disclosed in the present application performs charge transfer by connecting a first capacitor in parallel when the input voltage of the voltage regulator does not meet the voltage regulation input requirement. Compared with the method of directly inputting the voltage to be processed provided by the chip outside into the voltage regulator, the chip reduces the input voltage of the voltage regulator by charge transfer; thereby setting a power supply path with strong adaptability for the voltage regulator according to the different input voltages outside the chip, avoiding the influence of the high voltage difference between the input and output terminals of the voltage regulator, and improving the power supply conversion efficiency of the chip as a whole.

[0017] An electronic voltage stabilizing device, the electronic voltage stabilizing device comprises a first capacitor, a second capacitor, a third capacitor and the chip, wherein the chip is respectively provided with a signal input terminal, a signal output terminal, a first transmission terminal and a second transmission terminal, the signal input terminal is used to input the voltage to be processed, the first capacitor is connected in parallel to the first transmission terminal and the second transmission terminal, the signal output terminal is grounded through the second capacitor, and the voltage output terminal of the voltage stabilizer inside the chip is grounded through the third capacitor. Alternatively, the electronic voltage stabilizing device comprises a first capacitor, a second capacitor, a third capacitor and the power management circuit, wherein the power management circuit is respectively provided with a signal input terminal, a signal output terminal, a first transmission terminal and a second transmission terminal, the signal input terminal is used to input the voltage to be processed, the first capacitor is connected in parallel to the first transmission terminal and the second transmission terminal, the signal output terminal is grounded through the second capacitor, and the voltage output terminal of the voltage stabilizer inside the power management circuit is grounded through the third capacitor. In summary, in the electronic voltage stabilizing device disclosed in the present application, charge transfer is performed when the input voltage of the voltage stabilizer does not meet the voltage stabilization input requirement by connecting a single capacitor to a voltage control unit, thereby setting a power supply path with strong adaptability for the voltage stabilizer according to the different external input voltages. It is not only immune to the influence of the high voltage difference between the input and output of the internal voltage stabilizer, but also can stop using the first capacitor for charge transfer according to the input voltage of the internal voltage stabilizer to reduce power consumption, and has good applicability to the power supply voltage environment. It improves the level conversion efficiency of the voltage stabilizer as a whole, and realizes a low-cost voltage stabilizing device assembly design. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram showing that a chip where the power management circuit disclosed in the present application is located is connected to a first capacitor, a second capacitor and a third capacitor respectively.

[0019] Figure 2 The present application discloses a schematic diagram of a switch tube inside a voltage control unit being connected to a first capacitor and a second capacitor respectively. DETAILED DESCRIPTION

[0020] The specific implementation methods of the present application are further described below in conjunction with the accompanying drawings. In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] The buck module in the chip is either a DC-DC converter or a linear regulator. The boost-buck controller that acts as a linear regulator disclosed in the Chinese invention patent with patent application number CN202410226629.1 needs to couple each switch tube through a capacitor for charging, and still requires the participation of an inductor. In actual charging scenarios, the efficiency of combining inductors to solve the problem of switch charging and boosting is low. In addition, when the input-output voltage difference of the regulator is too high, as the input-output voltage difference increases, the efficiency of the device continues to decrease, resulting in high heat generation, which affects the level conversion performance of the regulator.

[0022] In view of the above technical defects, the present application discloses a power management circuit, which includes a voltage regulator, a first comparator and a voltage control unit. Figure 1 As shown, in the largest rectangular box, a voltage regulator LDO (specifically low dropout regulator, which is a low voltage difference linear regulator), a first comparator CMP1 and a voltage control unit PWR Control are respectively marked. The voltage regulator LDO leads out a port Vout at the boundary of the rectangular box to be configured as a voltage output terminal, a positive input terminal of the first comparator CMP1 and a signal input terminal of the voltage control unit PWR Control are connected to a port Vin at the boundary of the rectangular box, the voltage control unit PWR Control is connected to a first capacitor C1 at a port U1 and a port U2, respectively, and a signal output terminal of the voltage control unit PWR Control is led out to a port Pout at the boundary of the rectangular box and connected to a second capacitor C2.

[0023] In the power management circuit, a first comparator is connected to a voltage control unit, wherein the output of the first comparator is connected to the voltage control unit to feed back the comparison result of the first comparator; the voltage control unit is connected to a voltage regulator, and in order to drive the voltage regulator to stabilize the output voltage, the signal output of the voltage control unit is connected to the voltage input of the voltage regulator.

[0024] The first comparator is used to compare the external input voltage to be processed with a pre-configured first reference voltage, such as Figure 1 As shown, the first comparator CMP1 compares the to-be-processed voltage Vin inputted at the positive input terminal + and the first reference voltage Vref1 inputted at the negative input terminal −, and outputs the comparison result to the voltage control unit PWR Control.

[0025] The voltage control unit is used to connect the first capacitor, such as Figure 1 As shown, the voltage control unit PWR Control is connected to the first capacitor C1 through the port U1 and the port U2. Since the first capacitor occupies a large space, the first capacitor is not set in the power management circuit, but the first capacitor can play a charge transfer role to perform charging boost or discharging buck.

[0026] The voltage control unit is connected to the voltage regulator, and the common connection terminal of the voltage control unit and the voltage regulator is used to connect the second capacitor; schematically, as shown in Figure 1 As shown, the signal output terminal of the voltage control unit PWR Control and the voltage input terminal of the voltage regulator LDO are connected to a common connection terminal, and the common connection terminal is marked with Pout in the figure, and the common connection terminal Pout is grounded through the second capacitor C2. The signal output by the voltage control unit PWR Control is given to the voltage input terminal of the voltage regulator LDO, so that the voltage regulator LDO receives a voltage that reduces the power consumption requirement.

[0027] Based on this, the voltage control unit is used to open the charging path between the first capacitor and the second capacitor according to the comparison result of the first comparator, and use the first capacitor to transfer charge to realize charging the second capacitor, specifically including using the voltage to be processed as the first capacitor, and then charging the second capacitor by the first capacitor in the form of charge transfer, so that the voltage of the common connection terminal connected to the second capacitor is adjusted; at the same time, the second capacitor is kept as the path for powering the voltage regulator, and the second capacitor output voltage is controlled to the voltage regulator. Since the first capacitor is used for charge transfer, the voltage output by the second capacitor can be lower than the voltage to be processed; finally, the voltage regulator processes the input voltage into a regulated working voltage, so that the voltage regulator processes the input voltage into a regulated working voltage while reducing the absolute value of the voltage difference between its voltage input terminal and voltage output terminal. The regulated working voltage is a stable output voltage converted for the power supply to be processed by the voltage regulator, and belongs to a power supply voltage. It can be understood that no matter how much the voltage to be processed is, after the charge transfer by the first capacitor, the absolute value of the voltage difference between the regulated working voltage output by the voltage regulator and its input voltage is reduced.

[0028] The purpose of the voltage control unit controlling the charging operation / charge transfer of the first capacitor according to the comparison result of the first comparator is to overcome the problem of low level conversion efficiency of the voltage regulator caused by the high voltage difference between the external input voltage to be processed and the regulated working voltage (which can be a fixed voltage value) finally output by the voltage regulator. If the voltage difference between the voltage to be processed and the regulated working voltage is small, when the first comparator is used for comparison and detection, a first reference voltage is pre-configured, and the absolute value of the voltage difference between the first reference voltage and the regulated working voltage is set to be within an acceptable range of the voltage difference between the voltage input terminal and the voltage output terminal of the voltage regulator, so as to reduce heat consumption and improve the power conversion efficiency of the voltage regulator. In addition, if the first comparator compares and obtains that the voltage to be processed is lower than the first reference voltage but not too low, it is not necessary to use the first capacitor for charging operation, and the level conversion efficiency of the voltage regulator is not greatly affected.

[0029] In schematic form, after the voltage at the common connection terminal Pout is increased, the voltage difference between the voltage at the port Pout and the stabilized working voltage finally output by the voltage regulator is reduced, thereby reducing the heat generation power of the voltage regulator. Since the common connection terminal is connected to the second capacitor and the charge flowing through the common connection terminal can charge the second capacitor, the voltage at the common connection terminal is used to feed back the charging voltage of the second capacitor to the voltage regulator.

[0030] When the voltage to be processed is greater than the first reference voltage, if the voltage to be processed is directly input into the voltage regulator, the voltage difference between the voltage input terminal and the voltage output terminal of the voltage regulator may be too large, for example, greater than the absolute value of the voltage difference between the first reference voltage and the voltage regulation working voltage. It is considered that a high voltage difference is transmitted to the voltage regulator, and the first comparator will feedback to the voltage control unit, indicating that it is necessary to start controlling the first capacitor to transfer charge to divide the voltage to be processed so as to reduce the voltage to be processed.

[0031] In summary, the technical effect of the power management circuit disclosed in the present application is that a single capacitor is used and connected to a voltage control unit to perform charge transfer when the input voltage of the voltage regulator does not meet the voltage regulation input requirements. Compared with the method of directly inputting the voltage to be processed, the input voltage of the voltage regulator is reduced by charge transfer; thereby, a power supply path with strong adaptability is set for the voltage regulator according to the different external input voltages, which is not affected by the high voltage difference between the input and output of the voltage regulator and improves the power conversion efficiency, and can also stop using the capacitor for charge transfer according to the input voltage of the voltage regulator to reduce power consumption, and has good applicability to the voltage environment; overall, a low-cost circuit assembly design is achieved.

[0032] In the above embodiment, the specific form in which the voltage control unit implements the method of opening the charging path between the first capacitor and the second capacitor to use the first capacitor for charge transfer according to the comparison result of the first comparator includes: the voltage control unit is used to control the voltage to be processed to charge the first capacitor when the first comparator compares and obtains that the voltage to be processed is greater than the first reference voltage, so that the voltage control unit turns on the relevant circuit path, and while the first capacitor receives a part of the voltage, the charge stored in the first capacitor is transferred to the second capacitor to charge the second capacitor, which is equivalent to opening the charging path between the first capacitor and the second capacitor. Schematically, combined with Figure 1 and Figure 2 It can be seen that when the voltage to be processed Vin is greater than the first reference voltage Vref1, the voltage to be processed Vin charges the first capacitor C1, transfers and stores new charge for the first capacitor C1, and then the charging voltage of the first capacitor C1 is higher than the voltage of the second capacitor C2, and the charge stored in the first capacitor C1 is transferred to the second capacitor C2, and the voltage at the common connection terminal Pout connected to the positive electrode of the second capacitor C2 is increased, until the voltage at the signal output terminal of the voltage control unit is higher than the voltage stabilization working voltage, but the absolute value of the voltage difference between the voltage at the common connection terminal Pout and the voltage stabilization working voltage is less than the absolute value of the voltage difference between the voltage to be processed and the voltage stabilization working voltage, wherein the voltage at the common connection terminal is the voltage at the voltage input terminal of the regulator, and the voltage stabilization working voltage is the voltage at the voltage output terminal of the regulator; therefore, on the basis of maintaining the first capacitor and the second capacitor as the path for powering the regulator, the voltage at the signal output terminal of the voltage control unit meets the power consumption reduction requirement of the regulator, ensures that the voltage difference between the input and output of the regulator is not too high, and improves the power conversion efficiency.

[0033] It is worth noting that when the voltage to be processed is greater than the first reference voltage, without introducing the first capacitor and the aforementioned comparators, if the voltage to be processed is input into the voltage input terminal of the voltage regulator, then the absolute value of the voltage difference between the voltage output terminal of the voltage regulator and the voltage input terminal of the voltage regulator is greater than the absolute value of the voltage difference between the first reference voltage and the voltage regulated working voltage, then the voltage difference between the voltage input terminal of the voltage regulator and its voltage output terminal is too large, which is easy to accumulate serious heat and reduce the power conversion efficiency of the voltage regulator.

[0034] In addition, the voltage control unit is further configured to control the voltage to be processed to be transmitted to the voltage regulator without passing through the first capacitor when the voltage to be processed obtained by the first comparator is less than the first reference voltage, so that the voltage to be processed does not charge the first capacitor. Figure 1 and Figure 2It can be known that when the first comparator CMP1 compares and obtains that the voltage to be processed Vin is less than the first reference voltage Vref1, if the voltage to be processed Vin is directly input into the voltage input terminal of the voltage regulator, there will be no high voltage difference between the input and output of the voltage regulator and the level conversion efficiency will not be low. Then, there is no need to continue to detect the comparison result between the voltage of the common connection terminal Pout and the second reference voltage Vref2 by the second comparator, and then bypass the charge and discharge path where the first capacitor C1 is located, and directly transmit the voltage to be processed Vin to the common connection terminal Pout. At this time, the first capacitor C1 will not receive external charging charge, and the first capacitor C1 will not transfer charge to the second capacitor C2. Therefore, the voltage control unit detects that the voltage to be processed is relatively small and close to the stable working voltage based on the comparison result of the first comparator, and does not turn on the first capacitor for charge transfer (equivalent to not using a charge pump), and directly uses the voltage to be processed as the input voltage of the voltage regulator to ensure the power supply voltage conversion efficiency, prevent the absolute value of the voltage difference between the voltage output terminal of the voltage regulator and the voltage input terminal of the voltage regulator from exceeding the absolute value of the voltage difference between the first test voltage and the stabilized working voltage, and will not cause excessive loss to the power supply voltage conversion efficiency.

[0035] As an example, Figure 1 As shown, the power management circuit also includes a second comparator CMP2; the second comparator CMP2 is connected to the voltage control unit PWR Control, and the second comparator CMP2 is connected to the voltage regulator LDO; specifically, the output end of the second comparator CMP2 is connected to the input end of the voltage control unit PWR Control, and the input end of the second comparator CMP2 is connected to the input end of the voltage regulator LDO. Since the voltage control unit is connected to the voltage regulator, the second comparator, the voltage control unit and the voltage regulator are connected to form a circuit loop; the common connection end of the voltage control unit, the second comparator and the voltage regulator is used to connect the second capacitor; schematically, as shown Figure 1 As shown, the signal output terminal of the voltage control unit PWR Control, the positive input terminal + of the second comparator CMP2 and the voltage input terminal of the regulator LDO are connected to a common connection terminal, which is marked with Pout as shown in the figure. The common connection terminal Pout is grounded through the second capacitor C2.

[0036] The second comparator is used to compare the voltage of the common connection terminal with a pre-configured second reference voltage, such as Figure 1As shown, the second comparator CMP2 compares the Pout voltage input at the positive input terminal + and the second reference voltage Vref2 input at the negative input terminal -, and the comparison result is output to the voltage control unit PWR Control to feed back the comparison result of the second comparator CMP2. At the same time, the signal output by the voltage control unit PWR Control is simultaneously given to the positive input terminal + of the second comparator CMP2 and the voltage input terminal of the regulator LDO, so that the second comparator CMP2 continues to output a new comparison result to the voltage control unit PWR Control based on the signal output by the voltage control unit PWR Control, so that the regulator LDO receives a voltage that meets the power consumption reduction requirement.

[0037] The voltage control unit is also used to open the charging path between the first capacitor and the second capacitor according to the comparison result of the first comparator and the comparison result of the second comparator to use the first capacitor for charge transfer. Therefore, in the case where the first comparator feedback needs to be charged, the voltage of the common connection terminal is further compared with the pre-configured second reference voltage by the second comparator. If the voltage of the common connection terminal is already higher than the second reference voltage, the first capacitor does not need to be controlled to transfer charge, but the voltage of the common connection terminal is directly provided to the voltage regulator to reduce the power consumption at low current; on the contrary, the first capacitor is controlled to transfer charge, and the voltage of the common connection terminal is large enough to reduce the input-output voltage difference of the voltage regulator before it is provided to the voltage regulator, meeting the power consumption reduction requirements of the voltage regulator, and ensuring the stable and efficient output voltage of the voltage regulator. Then, the voltage of the second capacitor connected to the common connection terminal provides an effective power supply head for the voltage regulator (at this time, the voltage to be processed is used as the power supply voltage generated externally), and the voltage regulator can step down the voltage of the common connection terminal to obtain the stabilized working voltage.

[0038] Specifically, the specific form in which the voltage control unit implements the opening of the charging path between the first capacitor and the second capacitor to use the first capacitor for charge transfer based on the comparison result of the first comparator and the comparison result of the second comparator includes: the voltage control unit is used to control the voltage to be processed to charge the first capacitor when the first comparator compares and obtains that the voltage to be processed is greater than the first reference voltage, and the second comparator compares and obtains that the voltage of the common connection terminal is less than the second reference voltage, and at the same time, the charge stored in the first capacitor is transferred to the second capacitor to charge the second capacitor until the voltage of the common connection terminal meets the power consumption reduction requirement of the voltage regulator. It can be understood that when the voltage at the signal output terminal of the voltage control unit is higher than the voltage stabilization working voltage (this voltage magnitude relationship is obtained by comparison by the second comparator (the second reference voltage Vref2 is preferably greater than or equal to the voltage stabilization working voltage) and fed back to the voltage control unit), the first capacitor and the second capacitor are guided to power the voltage regulator, the absolute value of the voltage difference between the voltage input terminal and the voltage output terminal of the voltage regulator is reduced, and the first capacitor and the second capacitor are kept to power the voltage regulator. The voltage at the signal output terminal of the voltage control unit meets the power consumption reduction requirement of the voltage stabilizer, ensures that the voltage difference between the input and output of the voltage stabilizer is not too high, and improves the power conversion efficiency.

[0039] It is worth noting that when the voltage to be processed is less than the second reference voltage, without introducing the first capacitor and the aforementioned comparators, if the voltage to be processed is input into the voltage input terminal of the voltage regulator, then the absolute value of the voltage difference between the voltage output terminal of the voltage regulator and the voltage input terminal of the voltage regulator is greater than the absolute value of the voltage difference between the second reference voltage and the voltage regulated working voltage, then the voltage difference between the voltage input terminal of the voltage regulator and its voltage output terminal is too large, which is easy to accumulate serious heat and reduce the power conversion efficiency of the voltage regulator.

[0040] In some embodiments, the voltage control unit is further configured to shut off the charging path between the first capacitor and the second capacitor when the voltage of the common connection terminal obtained by the second comparator is greater than the second reference voltage, so as to stop the first capacitor from transferring charge, that is, to control the first capacitor not to charge the second capacitor. Figure 1 and Figure 2It can be known that when the voltage at the Pout terminal obtained by the second comparator CMP2 is greater than the second reference voltage Vref2, it is considered that the charge transfer result of the first capacitor has met the power consumption reduction requirement of the voltage regulator, and the charging and discharging path where the first capacitor C1 is located is bypassed, the first capacitor C1 is stopped from receiving external charging charge, and the first capacitor C1 is stopped from transferring charge to the second capacitor C2. In this way, the first capacitor can be controlled to stop charge transfer when the voltage at the common connection terminal is greater than the second reference voltage Vref2 in combination with the comparison result of the second comparator, thereby preventing the absolute value of the voltage difference between the voltage output terminal of the voltage regulator and the voltage input terminal of the voltage regulator from exceeding the absolute value of the voltage difference between the second reference voltage and the voltage regulation working voltage, thereby reducing the power consumption of the voltage regulator at low current.

[0041] It should be noted that when the voltage of the common connection terminal is greater than the second reference voltage, the voltage of the common connection terminal meets the power consumption reduction requirement of the voltage regulator, so that the voltage regulator steps down the voltage of the common connection terminal to the voltage stabilization working voltage. At the same time, in some embodiments, the voltage of the common connection terminal can be regarded as the result of the charge transfer from the first capacitor to the second capacitor, and the voltage of the common connection terminal can also charge the second capacitor to maintain the voltage stabilization effect originally required by the voltage regulator; wherein the voltage reduction process is configured as the main level conversion operation of the voltage regulator to ensure a stable output voltage.

[0042] As an embodiment, the voltage control unit is provided with a signal input terminal, a first feedback input terminal, a second feedback input terminal, a signal output terminal, a first transmission terminal and a second transmission terminal; the signal input terminal of the voltage control unit is used to input the voltage to be processed; the first feedback input terminal of the voltage control unit is connected to the output terminal of the first comparator, such as Figure 1 As shown, the first feedback input terminal of the voltage control unit PWR Control is connected to the output terminal of the first comparator CMP1.

[0043] The positive input terminal of the first comparator is used to input the voltage to be processed, and the negative input terminal of the first comparator is used to input the first reference voltage. Figure 1 As shown, the positive input terminal + of the first comparator CMP1 inputs the voltage to be processed Vin, and the negative input terminal - of the first comparator CMP1 inputs the first reference voltage Vref1; when the voltage to be processed Vin is greater than the first reference voltage Vref1, the first comparator CMP1 outputs a high level, otherwise the first comparator CMP1 outputs a low level, which are two comparison results of the first comparator CMP1, respectively, so that the first comparator CMP1 compares the size between the voltage to be processed Vin and the first reference voltage Vref1 to choose to directly use the voltage to be processed Vin as the input of the regulator.

[0044] The first transmission end and the second transmission end of the voltage control unit are respectively connected to the two ends of the first capacitor, and the signal output end of the voltage control unit is the common connection end; the signal output end of the voltage control unit is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; schematically, as shown Figure 1 As shown, the first transmission terminal U1 and the second transmission terminal U2 of the voltage control unit PWR Control are connected in parallel to the first capacitor C1, the positive plate of the second capacitor C2 is connected to the signal output terminal Pout of the voltage control unit PWRControl, the negative plate of the second capacitor C2 is grounded, and the positive plate of the second capacitor C2 is connected to the in-phase input terminal of the regulator LDO, so that the charging voltage of the second capacitor C2 supplies the regulator LDO with an input voltage that meets the requirement of reducing power consumption.

[0045] The positive input terminal of the second comparator is connected to the signal output terminal of the voltage control unit, and the negative input terminal of the second comparator is used to input the second reference voltage. Schematically, as shown in FIG. Figure 1 As shown, the positive input terminal + of the second comparator CMP2 is connected to the signal output terminal Pout of the voltage control unit PWR Control, and the negative input terminal - of the second comparator CMP2 is connected to the second reference voltage Vref2; when the voltage of the signal output terminal Pout is greater than the second reference voltage Vref2, the second comparator CMP2 outputs a high level, otherwise the second comparator CMP2 outputs a low level, which are two comparison results of the second comparator CMP2, respectively. The second comparator CMP1 compares the voltage of the signal output terminal Pout with the second reference voltage Vref2, and then selects the first capacitor C1 to start charge transfer to the second capacitor C2 according to the comparison results of the first comparator and the second comparator. Compared with directly configuring the voltage to be processed as the input voltage of the regulator, the first capacitor is used to transfer charge to reduce the voltage difference between the input voltage of the regulator and the stable working voltage, thereby improving the power conversion efficiency of the regulator and also facilitating the power consumption of the control circuit.

[0046] Specifically, the voltage control unit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; the control end of the first switch tube, the control end of the second switch tube, the control end of the third switch tube and the control end of the fourth switch tube are simultaneously controlled by the comparison result of the first comparator and the comparison result of the second comparator. It can be understood that after the comparison result of the first comparator and the comparison result of the second comparator are processed by combination logic or encoding, a signal is applied to the control end of the first switch tube, the control end of the second switch tube, the control end of the third switch tube and the control end of the fourth switch tube at the same time to open or close the corresponding switch tube to control the voltage to be processed to charge the first capacitor (equivalent to opening the charging path between the first capacitor and the second capacitor), or control the voltage to be processed to be transmitted to the regulator without passing through the first capacitor, or shut down the charging path between the first capacitor and the second capacitor.

[0047] The charging path between the first capacitor and the second capacitor is a circuit path formed by sequentially connecting the first switch tube, the first capacitor, the fourth switch tube and the second capacitor when the first switch tube is turned on and the fourth switch tube is turned on, and the second switch tube is turned off and the third switch tube is turned off; based on the comparison result of the first comparator and the comparison result of the second comparator, as Figure 2 As shown, when the first switch tube SW1 is turned on (approximately equal to the wire after being turned on, and the impedance is small), the fourth switch tube SW4 is turned on (approximately equal to the wire after being turned on, and the impedance is small), the second switch tube SW2 is turned off, and the third switch tube SW3 is turned off, the first switch tube SW1, the first capacitor C1, the fourth switch tube SW4 and the second capacitor C2 are connected in series in sequence to form a path for charge transfer, and the first capacitor C1 and the second capacitor C2 can be charged in sequence through the voltage to be processed Vin.

[0048] Contrary to the above switch control logic, the first capacitor and the second capacitor supply power to the voltage regulator through a circuit path formed by connecting the second switch, the first capacitor, the third switch, the second capacitor and the voltage regulator when the first switch is turned off and the fourth switch is turned off, and the second switch is turned on and the third switch is turned on. Figure 2 As shown, when the second switch tube SW2 is turned on (approximately equal to the wire after being turned on, and the impedance is small), the third switch tube SW3 is turned on (approximately equal to the wire after being turned on, and the impedance is small), the first switch tube SW1 is turned off, and the fourth switch tube SW4 is turned off, the second switch tube SW2, the first capacitor C1, the third switch tube SW3 and the second capacitor C2 are connected to form a circuit path, providing the voltage regulator with a signal that meets the power consumption reduction requirement of the voltage regulator.

[0049] In addition, the path for transmitting the voltage to be processed to the voltage regulator without passing through the first capacitor is a circuit path formed by connecting the first switch tube, the third switch tube and the voltage regulator when the first switch tube is turned on and the third switch tube is turned on, and the second switch tube is turned off and the fourth switch tube is turned off. Figure 1 and Figure 2 It can be known that when the first comparator CMP1 compares and obtains that the voltage to be processed Vin is less than the first reference voltage Vref1, Figure 2 The first switch tube SW1 is turned on and the third switch tube SW3 is turned on, and the second switch tube SW2 is turned off and the fourth switch tube SW4 is turned off, opening the path for transmitting the voltage to be processed to the voltage regulator without passing through the first capacitor, and the voltage to be processed Vin bypasses the charging and discharging path where the first capacitor C1 is located, and directly transmits the voltage to be processed Vin to the common connection terminal Pout, so that the voltage to be processed Vin is directly given to the voltage input terminal of the voltage regulator LDO. Among them, the charging and discharging path where the first capacitor C1 is located includes a circuit path formed by connecting the first capacitor C1, the fourth switch tube SW4 and the second capacitor C2 in sequence, and the charging and discharging path has an overlapping part with the charging path between the first capacitor and the second capacitor.

[0050] Based on the above embodiments, combined with Figure 1 and Figure 2 The specific connection structure of each switch tube is described as follows: in the voltage control unit PWR Control, the first transmission end of the first switch tube SW1 is used to input the voltage to be processed Vin, the first transmission end of the third switch tube SW3 and the second transmission end of the first switch tube SW1 are connected to one end of the first capacitor C1, the first transmission end of the second switch tube SW2 and the first transmission end of the fourth switch tube SW4 are connected to the other end of the first capacitor C2, the second transmission end of the second switch tube SW2 is grounded, and the second transmission end of the fourth switch tube SW4 and the second transmission end of the third switch tube SW3 are connected to the common connection end Pout. Among them, the first transmission end of the first switch tube is connected to the signal input end of the voltage control unit, one end of the first capacitor is connected to the first transmission end of the voltage control unit, and the other end of the first capacitor is connected to the second transmission end of the voltage control unit. When each switch tube is an NMOS tube, the first transmission end of the switch tube is a drain end, and the second transmission end of the switch tube is a source end; or when each switch tube is a PMOS tube, the first transmission end of the switch tube is a source end, and the second transmission end of the switch tube is a drain end.

[0051] exist Figure 2In the circuit shown, the first switch tube SW1 and the fourth switch tube SW4 are used to charge the first capacitor C1, and are both controlled by the first comparator CMP1 and the second comparator CMP2; when the voltage to be processed Vin is less than the first reference voltage Vref1, the first switch tube SW1 is turned on and the third switch tube SW3 is turned on, and the second switch tube SW2 is turned off and the fourth switch tube SW4 is turned off, and the voltage to be processed Vin is transmitted to the Pout terminal. At this time, the voltage to be processed Vin is directly given to the voltage input terminal of the regulator LDO, and will continue to charge the second capacitor C2, causing the voltage change at the Pout terminal. At this time, the first switch tube SW1 is turned on and the third switch tube SW3 is regarded as a group of switch tubes, and the second switch tube SW2 is turned off and the fourth switch tube SW4 is regarded as another group of switch tubes.

[0052] When the voltage at the Pout terminal is less than the second reference voltage Vref2, and the to-be-processed voltage Vin is greater than the first reference voltage Vref1, the first switch tube SW1 is turned on and the fourth switch tube SW4 is turned on, and the second switch tube SW2 is turned off and the third switch tube SW3 is turned off, and the to-be-processed voltage Vin is transmitted to the U1 terminal, and the to-be-processed voltage Vin will continue to charge the first capacitor C1, causing the voltage difference between the U1 terminal and the U2 terminal to change. At this time, the first capacitor C1 performs charge transfer to charge the second capacitor C2, and the Vin voltage changes after the charge transfer, and then is fed back to the Pout terminal, thereby using the charge transfer method to reduce the to-be-processed voltage Vin that needs to be transmitted to the voltage input terminal of the regulator (real-time feedback is the increased voltage at the Pout terminal); at this time, the first switch tube SW1 is turned on and the fourth switch tube SW4 is regarded as a group of switch tubes, and the second switch tube SW2 is turned off and the third switch tube SW3 is regarded as another group of switch tubes.

[0053] When the voltage at the Pout terminal becomes greater than the second reference voltage Vref2, the first switch tube SW1 is turned off and the fourth switch tube SW4 is turned off, and the second switch tube SW2 is turned on and the third switch tube SW3 is turned on, and the electric energy stored in the first capacitor C1 and the second capacitor C2 is directly distributed to the voltage input terminal of the regulator. At this time, the first switch tube SW1 is turned on and the fourth switch tube SW4 is regarded as a group of switch tubes, and the second switch tube SW2 is turned off and the third switch tube SW3 is regarded as another group of switch tubes.

[0054] In summary, the power management circuit disclosed in the present application couples a first capacitor between multiple groups of switch tubes, and drives each switch tube to charge or pass the capacitor according to the comparison results of each comparator, thereby providing a suitable input voltage for the voltage regulator and improving the power conversion efficiency.

[0055] It should be added that the efficiency of the aforementioned charge transfer depends on the internal resistance of the first capacitor, the second capacitor and each switch tube. The time constant formed by the internal resistance of the first capacitor, the second capacitor and each switch tube is closely related to the stability of the circuit. For example, during the charging and discharging process of the capacitor, the time required for the terminal voltage of the capacitor to reach 63% or 37% of the maximum value is the time constant. The internal resistance of each switch tube is preferably less than 1 ohm, which greatly reduces heat consumption. The aforementioned switch tube is preferably a MOS tube.

[0056] The present application discloses a chip, wherein the power management circuit is arranged inside the chip, and a block diagram inside the chip is shown as follows: Figure 1 As shown, the signal input terminal set by the voltage control unit PWR Control in the chip is connected to the power input terminal of the chip to input the voltage to be processed Vin outside the chip, the first transmission terminal and the second transmission terminal set by the voltage control unit PWR Control are respectively connected to the first transmission terminal U1 and the second transmission terminal U2 of the chip, the signal output terminal set by the voltage control unit is connected to the signal output terminal Pout of the chip, the chip is also provided with a voltage output terminal Vout connected to the voltage output terminal of the regulator LDO, the voltage output terminal Vout of the chip is grounded through the third capacitor C3, and the signal output terminal Pout of the chip is grounded through the second capacitor C2. Compared with the prior art, the first transmission terminal U1 and the second transmission terminal U2 of the chip are respectively connected to the two ends of the first capacitor C1. After the voltage to be processed Vin is input into the power input terminal of the chip, it is transmitted to the voltage control unit PWR Control. The voltage control unit PWR Control uses the first capacitor C1 to complete the charge transfer and charges the second capacitor C2, so that the voltage at the Pout terminal is higher than the voltage required by the voltage regulator LDO. It is regarded that the voltage input terminal of the voltage regulator LDO obtains a voltage that meets the power consumption reduction requirement of the voltage regulator. At the same time, the first capacitor C1 that completes the charge transfer and the second capacitor C2 that completes the charging are both powered by the voltage regulator. Then the voltage regulator LDO steps down the voltage at the Pout terminal to obtain the required voltage, that is, the aforementioned voltage-stabilized working voltage.

[0057] In combination with the power management circuit disclosed in the aforementioned embodiment, the chip disclosed in the present application performs charge transfer when the input voltage of the voltage regulator does not meet the voltage regulation input requirement by connecting a first capacitor in parallel. Compared with the method of directly inputting the processed voltage provided by the outside of the chip into the voltage regulator, the chip reduces the input voltage of the voltage regulator by charge transfer; thereby, a more adaptable power supply path is set for the voltage regulator according to the different external input voltages of the chip, which is free from the influence of the high voltage difference between the input and output terminals of the voltage regulator, thereby improving the power supply conversion efficiency of the chip as a whole.

[0058] Based on the aforementioned embodiments, the present application discloses an electronic voltage stabilizing device, which includes a first capacitor, a second capacitor, a third capacitor and the chip, wherein the chip is respectively provided with a signal input terminal, a signal output terminal, a first transmission terminal and a second transmission terminal, the signal input terminal is used to input the voltage to be processed, the first capacitor is connected in parallel to the first transmission terminal and the second transmission terminal, the signal output terminal is grounded through the second capacitor, and the voltage output terminal of the voltage regulator inside the chip is grounded through the third capacitor. It should be noted that the connection nodes between the various components and modules integrated in the chip mentioned above are all arranged in the chip and can be connected to the relevant pins of the chip.

[0059] Alternatively, the electronic voltage stabilization device disclosed in the present application includes a first capacitor, a second capacitor, a third capacitor and the power management circuit, wherein the power management circuit is respectively provided with a signal input terminal, a signal output terminal, a first transmission terminal and a second transmission terminal, the signal input terminal is used to input the voltage to be processed, the first capacitor is connected in parallel to the first transmission terminal and the second transmission terminal, the signal output terminal is grounded through the second capacitor, and the voltage output terminal of the voltage regulator inside the power management circuit is grounded through the third capacitor.

[0060] It should be noted that the second capacitor and the third capacitor are both voltage stabilizing capacitors required for the voltage stabilizer to work in a stable voltage, and the first capacitor is a capacitor coupled between the first switch tube to the fourth switch tube, which is different from the prior art. The specific connection method is as follows Figure 2 As shown, the application purpose is to drive the voltage regulator LDO to work. For the connection structure and functional description of each port of the power management circuit and its internal and external circuits, please refer to the embodiment of the power management circuit mentioned above.

[0061] In summary, in the electronic voltage stabilizing device disclosed in the present application, charge transfer is performed when the input voltage of the voltage stabilizer does not meet the voltage stabilization input requirement by connecting a single capacitor to a voltage control unit, thereby setting a power supply path with strong adaptability for the voltage stabilizer according to the different external input voltages. It is not only immune to the influence of the high voltage difference between the input and output of the internal voltage stabilizer, but also can stop using the first capacitor for charge transfer according to the input voltage of the internal voltage stabilizer to reduce power consumption, and has good applicability to the power supply voltage environment. It improves the level conversion efficiency of the voltage stabilizer as a whole, and realizes a low-cost voltage stabilizing equipment assembly design.

[0062] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A power management circuit, characterized in that: The power management circuit includes a voltage stabilizer, a first comparator and a voltage control unit; The first comparator is connected to the voltage control unit, and the voltage control unit is connected to the voltage stabilizer; A first comparator, used for comparing an externally input voltage to be processed with a pre-configured first reference voltage; The voltage control unit is used to connect the first capacitor; The common connection terminal of the voltage control unit and the voltage stabilizer is used to connect the second capacitor; A voltage control unit is used to open a charging path between the first capacitor and the second capacitor according to a comparison result of the first comparator to use the first capacitor for charge transfer, and the first capacitor and the second capacitor are used to power a voltage regulator, so that the voltage regulator processes the input voltage into a voltage-regulated working voltage while reducing the absolute value of the voltage difference between its voltage input terminal and voltage output terminal; wherein the voltage of the common connection terminal is used to feed back the voltage of the second capacitor to the voltage regulator.

2. The power management circuit according to claim 1, characterized in that: The voltage control unit is used to control the voltage to be processed to charge the first capacitor when the first comparator compares and obtains that the voltage to be processed is greater than the first reference voltage, and at the same time drive the charge stored in the first capacitor to be transferred to the second capacitor to charge the second capacitor until the voltage at the common connection terminal meets the power consumption reduction requirement of the voltage regulator, so as to reduce the absolute value of the voltage difference between the voltage at the common connection terminal and the voltage stabilization working voltage, wherein the voltage at the common connection terminal is the voltage at the voltage input terminal of the voltage regulator, and the voltage stabilization working voltage is the voltage at the voltage output terminal of the voltage regulator.

3. The power management circuit according to claim 2, characterized in that: The voltage control unit is further used to control the voltage to be processed to be transmitted to the voltage regulator without passing through the first capacitor when the first comparator compares and obtains that the voltage to be processed is less than the first reference voltage, so that the voltage to be processed does not charge the first capacitor.

4. The power management circuit according to claim 2, characterized in that: The power management circuit also includes a second comparator; The second comparator is connected to the voltage control unit, and the second comparator is connected to the voltage regulator; The common connection terminal of the voltage control unit, the second comparator and the voltage stabilizer is used to connect the second capacitor; A second comparator, used for comparing the voltage of the common connection terminal with a pre-configured second reference voltage; The voltage control unit is further used to open a charging path between the first capacitor and the second capacitor according to a comparison result of the first comparator and a comparison result of the second comparator to utilize the first capacitor for charge transfer.

5. The power management circuit according to claim 4, characterized in that: The voltage control unit is used to control the voltage to be processed to charge the first capacitor when the first comparator compares that the voltage to be processed is greater than the first reference voltage, and the second comparator compares that the voltage at the common connection terminal is less than the second reference voltage, and at the same time, the charge stored in the first capacitor is transferred to the second capacitor to charge the second capacitor until the voltage at the common connection terminal meets the power consumption reduction requirement of the regulator, so as to reduce the absolute value of the voltage difference between the voltage input terminal and the voltage output terminal of the regulator, and keep the first capacitor and the second capacitor to power the regulator.

6. The power management circuit according to claim 5, characterized in that: The voltage control unit is further used to cut off the charging path between the first capacitor and the second capacitor to stop the charge transfer of the first capacitor when the voltage of the common connection terminal obtained by comparison by the second comparator is greater than the second reference voltage.

7. The power management circuit according to claim 4, characterized in that: The voltage control unit is provided with a signal input terminal, a first feedback input terminal, a second feedback input terminal, a signal output terminal, a first transmission terminal and a second transmission terminal; The signal input terminal of the voltage control unit is used to input the voltage to be processed; The first feedback input terminal of the voltage control unit is connected to the output terminal of the first comparator, the positive input terminal of the first comparator is used to input the voltage to be processed, and the negative input terminal of the first comparator is used to input the first reference voltage; The first transmission end of the voltage control unit and the second transmission end of the voltage control unit are respectively connected to the two ends of the first capacitor, and the signal output end of the voltage control unit is the common connection end; the signal output end of the voltage control unit is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; The second feedback input terminal of the voltage control unit is connected to the output terminal of the second comparator, the positive input terminal of the second comparator is connected to the signal output terminal of the voltage control unit, and the negative input terminal of the second comparator is used to input the second reference voltage.

8. The power management circuit according to claim 7, characterized in that: The voltage control unit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; The charging path between the first capacitor and the second capacitor is a circuit path formed by sequentially connecting the first switch tube, the first capacitor, the fourth switch tube and the second capacitor when the first switch tube is turned on and the fourth switch tube is turned on, and the second switch tube is turned off and the third switch tube is turned off; Among them, the path for the first capacitor and the second capacitor to supply power to the regulator is a circuit path formed by connecting the second switch tube, the first capacitor, the third switch tube and the second capacitor when the first switch tube is turned off and the fourth switch tube is turned off, and the second switch tube is turned on and the third switch tube is turned on.

9. The power management circuit according to claim 8, characterized in that: The path for transmitting the processed voltage to the voltage regulator without passing through the first capacitor is a circuit path formed by connecting the first switch tube, the third switch tube and the voltage regulator when the first switch tube and the third switch tube are turned on and the second switch tube and the fourth switch tube are turned off.

10. The power management circuit according to claim 8, characterized in that: In the voltage control unit, the first transmission end of the first switch tube is used to input the voltage to be processed, the first transmission end of the third switch tube and the second transmission end of the first switch tube are connected to one end of the first capacitor, the first transmission end of the second switch tube and the first transmission end of the fourth switch tube are connected to the other end of the first capacitor, the second transmission end of the second switch tube is grounded, and the second transmission end of the fourth switch tube and the second transmission end of the third switch tube are connected to the common connection end; Among them, the first transmission end of the first switch tube is connected to the signal input end of the voltage control unit, one end of the first capacitor is connected to the first transmission end of the voltage control unit, and the other end of the first capacitor is connected to the second transmission end of the voltage control unit.

11. A chip, characterized in that: The power management circuit according to any one of claims 1 to 10 is arranged inside the chip.

12. Electronic voltage stabilization equipment, characterized in that, The electronic voltage stabilizing device comprises a first capacitor, a second capacitor, a third capacitor and the chip according to claim 11, wherein the chip is respectively provided with a signal input terminal, a signal output terminal, a first transmission terminal and a second transmission terminal, the signal input terminal is used to input the voltage to be processed, the first capacitor is connected to the first transmission terminal and the second transmission terminal in parallel, the signal output terminal is grounded through the second capacitor, and the voltage output terminal of the voltage stabilizer inside the chip is grounded through the third capacitor; Alternatively, the electronic voltage stabilization device includes a first capacitor, a second capacitor, a third capacitor and the power management circuit as described in any one of claims 1 to 10, wherein the power management circuit is respectively provided with a signal input terminal, a signal output terminal, a first transmission terminal and a second transmission terminal, the signal input terminal is used to input the voltage to be processed, the first capacitor is connected in parallel to the first transmission terminal and the second transmission terminal, the signal output terminal is grounded through the second capacitor, and the voltage output terminal of the voltage regulator inside the power management circuit is grounded through the third capacitor.

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