Voltage regulating circuit

Abstract

The application discloses a voltage regulating circuit, and relates to the technical field of electronic circuits, wherein the voltage regulating circuit comprises a shared capacitor module, a first voltage regulating module and a second voltage regulating module; wherein the first voltage regulating module and the shared capacitor module are used as a boost ratio of a control circuit, and output a first target voltage value through the first voltage regulating module; the second voltage regulating module and the shared capacitor module are used as a buck ratio of the control circuit, and output a second target voltage value through the second voltage regulating module. In the manner, the first voltage regulating module and the second voltage regulating module are combined and used, a corresponding boost or buck adjustment is completed through the shared capacitor module, a target voltage is obtained, device cost is saved, resource occupation is reduced, and the output efficiency of the circuit is improved.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and in particular to a voltage regulating circuit. Background Technology

[0002] As a crucial component of robotic systems, the dexterous hand plays a vital role in performing various precision tasks. Dexterous hand applications in robots have high requirements for area and energy density, thus necessitating a small chip area, fewer pins, fewer external components, and careful consideration of heat dissipation, requiring high power efficiency. Furthermore, dexterous hand applications require pre-drive circuitry to control the motors, typically necessitating a boost charge pump module; while other modules within the chip require lower supply voltages. Therefore, this chip needs to support both buck and boost applications, and the buck and boost modules must operate simultaneously. Switched-capacitor converters are inductor-free converters; due to the absence of external inductors, the circuit board can be made smaller, while reducing electromagnetic interference. Therefore, a switched-capacitor power architecture is a good choice for dexterous hand chips. Buck modules typically require a relatively constant output voltage, while the input power supply usually has a wide voltage range; therefore, a multi-ratio switched-capacitor scheme can be used for buck modules. Boost modules typically require an output voltage that is a fixed value higher than the input power supply voltage; therefore, a charge pump solution can be used for boost modules.

[0003] Since a charge pump requires a capacitor, a multi-voltage switching capacitor requires at least one capacitor. A single capacitor occupies two pins on the chip, as well as an external capacitor bank. For demanding applications, the resource consumption of a single capacitor is significant. The common practice is to implement the switching capacitor boost module and the switching capacitor buck module separately, designing each module individually. This results in additional chip pins being needed for the external capacitor, potentially leading to insufficient chip pins and other issues. Summary of the Invention

[0004] The main objective of this invention is to propose a voltage regulation circuit that aims to achieve multi-voltage ratio boosting or bucking through a shared capacitor module. This solves the problems of excessive resource consumption, high cost, and low efficiency caused by the need to use a large number of separate capacitors when simultaneously implementing boosting and bucking functions in a single circuit.

[0005] To achieve the above objectives, the voltage regulation circuit proposed in this invention includes: a shared capacitor module, with a first terminal coupled to the positive terminal of a power supply and a second terminal coupled to the negative terminal of a power supply; a first voltage regulating module, coupled to the first and second terminals of the shared capacitor module, with its output terminal coupled to a load; a second voltage regulating module, coupled to the first and second terminals of the shared capacitor module, with its output terminal coupled to the load; and a control module, coupled to the shared capacitor module, the first voltage regulating module, and the second voltage regulating module. The control module controls the boost ratio of the first voltage regulating module and the shared capacitor module as part of the control circuit, and outputs a first target voltage value through the first voltage regulating module. The control module also controls the buck ratio of the second voltage regulating module and the shared capacitor module as part of the control circuit, and outputs a second target voltage value through the second voltage regulating module.

[0006] In one embodiment, the voltage regulation circuit further includes: a high-voltage detection module, the input terminal of which is coupled to the output terminal of the first voltage regulation module, and the output terminal of which is coupled to the control module; wherein, in response to the output voltage value of the first voltage regulation module, the high-voltage detection module outputs a high-voltage feedback signal to the control module; the control module, in response to the high-voltage feedback signal, controls and adjusts the boost ratio of the first voltage regulation module and the shared capacitor module, and outputs a first target voltage value.

[0007] In one embodiment, the voltage regulation circuit further includes: a low-voltage detection module, the input terminal of which is coupled to the output terminal of the second voltage regulation module, and the output terminal of which is coupled to the control module; wherein, in response to the output voltage value of the second voltage regulation module, the low-voltage detection module outputs a low-voltage feedback signal to the control module; the control module, in response to the low-voltage feedback signal, controls and adjusts the step-down ratio of the second voltage regulation module and the shared capacitor module, and outputs a second target voltage value.

[0008] In one embodiment, the shared capacitor module includes: a first capacitor, a first terminal of which is coupled to a first terminal of a first voltage regulating module and a first terminal of a second voltage regulating module, and a second terminal of the first capacitor is coupled to a second terminal of the first voltage regulating module and a second terminal of the second voltage regulating module.

[0009] In one embodiment, the second voltage regulating module includes: a first switch, a first terminal of which is coupled to the positive terminal of a power supply, and a second terminal of which is coupled to the first terminal of a shared capacitor module; a second switch, a first terminal of which is coupled to the second terminal of the first switch; a third switch, a first terminal of which is coupled to the second terminal of the second switch, and the second terminal of the third switch is coupled to the second terminal of the shared capacitor module; a fourth switch, a first terminal of which is coupled to the second terminal of the third switch, and the second terminal of the fourth switch is coupled to the negative terminal of a power supply; a second capacitor, a first terminal of which is coupled to the second terminal of the third switch, and the second terminal of the second capacitor is coupled to the negative terminal of a power supply; and a first resistor, a first terminal of which is coupled to the first terminal of the second capacitor, and the second terminal of the first resistor is coupled to the second terminal of the second capacitor.

[0010] In one embodiment, the first voltage regulating module includes: a second switch, the first end of which is coupled to the second end of the first switch; a fourth switch, the first end of which is coupled to the second end of a third switch, and the second end of the fourth switch is coupled to the negative terminal of the power supply; a third capacitor, the first end of which is coupled to the first end of the first switch; a fifth switch, the first end of which is coupled to the second end of the third capacitor, and the second end of the fifth switch is coupled to the first end of the second switch; a sixth switch, the first end of which is coupled to the positive terminal of the power supply, and the second end of the sixth switch is coupled to the second end of the third switch; and a second resistor, the first end of which is coupled to the first end of the fifth switch, and the second end of the second resistor is coupled to the negative terminal of the power supply; wherein the second switch and the fourth switch are shared switches for the first voltage regulating module and the second voltage regulating module.

[0011] In one embodiment, the shared capacitor module further includes: a seventh switch, the first end of which is coupled to the second end of the first capacitor; and a fourth capacitor, the first end of which is coupled to the second end of the seventh switch, and the second end of which is coupled to the first end of the fourth switch. The second voltage regulating module further includes: an eighth switch, the first end of which is coupled to the positive terminal of the power supply, and the second end of which is coupled to the second end of the seventh switch; and a ninth switch, the first end of which is coupled to the first end of the seventh switch, and the second end of which is coupled to the second end of the second switch.

[0012] In one embodiment, the first voltage regulating module includes: a second switch, the first end of which is coupled to the second end of the first switch; a fourth switch, the first end of which is coupled to the second end of the third switch, and the second end of the fourth switch is coupled to the negative terminal of the power supply; a third capacitor, the first end of which is coupled to the first end of the first switch; a fifth switch, the first end of which is coupled to the second end of the third capacitor, and the second end of the fifth switch is coupled to the first end of the second switch; a second resistor, the first end of which is coupled to the first end of the fifth switch, and the second end of the second resistor is coupled to the negative terminal of the power supply; a sixth switch, the first end of which is coupled to the positive terminal of the power supply, and the second end of the sixth switch is coupled to the first end of the fourth switch; a seventh switch, the first end of which is coupled to the second end of the first capacitor, and the second end of the seventh switch is coupled to the second end of the fourth capacitor; and an eighth switch, the first end of which is coupled to the positive terminal of the power supply, and the second end of the eighth switch is coupled to the first end of the fourth capacitor; wherein the second switch, the fourth switch, the seventh switch, and the eighth switch are shared switches for the first voltage regulating module and the second voltage regulating module.

[0013] In one embodiment, the first voltage regulating module includes: a first switch, which is a shared switch for the first voltage regulating module and the second voltage regulating module; a third switch, the first end of which is coupled to the second end of a fourth capacitor, and the second end of which is coupled to the first end of a first resistor; a third capacitor, the first end of which is coupled to the first end of the first switch; a fifth switch, the first end of which is coupled to the second end of the third capacitor, and the second end of which is coupled to the first end of the second switch; a second resistor, the first end of which is coupled to the first end of the fifth switch, and the second end of which is coupled to the negative terminal of the power supply; a sixth switch, the first end of which is coupled to the positive terminal of the power supply, and the second end of which is coupled to the first end of the fourth switch; and a seventh switch, the first end of which is coupled to the second end of the first capacitor, and the second end of which is coupled to the second end of the fourth capacitor; wherein the first switch, the third switch, and the seventh switch are shared switches for the first voltage regulating module and the second voltage regulating module.

[0014] In one embodiment, the first voltage regulating module includes: a first switch, which is a shared switch for the first voltage regulating module and the second voltage regulating module; a third capacitor, the first terminal of which is coupled to the first terminal of the first switch; a fifth switch, the first terminal of which is coupled to the second terminal of the third capacitor, and the second terminal of which is coupled to the first terminal of the second switch; a second resistor, the first terminal of which is coupled to the first terminal of the fifth switch, and the second terminal of which is coupled to the negative terminal of the power supply; a fourth switch, the first terminal of which is coupled to the second terminal of the third switch, and the second terminal of which is coupled to the negative terminal of the power supply; a sixth switch, the first terminal of which is coupled to the positive terminal of the power supply, and the second terminal of which is coupled to the first terminal of the fourth switch; and a seventh switch, the first terminal of which is coupled to the second terminal of the first capacitor, and the second terminal of which is coupled to the second terminal of the fourth capacitor; wherein the first switch, the fourth switch, and the seventh switch are shared switches for the first voltage regulating module and the second voltage regulating module.

[0015] The technical solution of the present invention can complete the corresponding boost or buck adjustment by combining the first voltage regulation module and the second voltage regulation module and sharing a common capacitor module, thereby obtaining the target voltage, saving device costs, reducing resource occupation, and improving the output efficiency of the circuit. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment of the voltage regulation circuit provided in this application.

[0018] Figure 2 This is a schematic diagram of the second embodiment of the voltage regulation circuit provided in this application.

[0019] Figure 3 This is a schematic diagram of the third embodiment of the voltage regulation circuit provided in this application.

[0020] Figure 4 This is a schematic diagram of an embodiment of the low-voltage detection module provided in this application.

[0021] Figure 5 This is a schematic diagram of the fourth embodiment of the voltage regulation circuit provided in this application.

[0022] Figure 6 This is a schematic diagram of the circuit state transition of an embodiment of the voltage regulation circuit provided in this application.

[0023] Figure 7 yes Figure 5 A schematic diagram of the circuit structure in the step-down operating state of the embodiment.

[0024] Figure 8 yes Figure 5 A schematic diagram of the circuit structure in the boost operation state of the embodiment.

[0025] Figure 9 This is a schematic diagram of the fifth embodiment of the voltage regulation circuit provided in this application.

[0026] Figure 10 yes Figure 9 A schematic diagram of the circuit structure in the step-down operating state of the embodiment.

[0027] Figure 11 yes Figure 9 A schematic diagram of the circuit structure in the boost operation state of the embodiment.

[0028] Figure 12 This application Figure 9 The timing diagram corresponds to the first embodiment.

[0029] Figure 13 This application Figure 9 The timing diagram corresponds to the second embodiment.

[0030] Figure 14 This is a schematic diagram of the sixth embodiment of the voltage regulation circuit provided in this application.

[0031] Figure 15 yes Figure 14 A schematic diagram of the circuit structure corresponding to the working state in the embodiment.

[0032] Figure 16 This is a schematic diagram of the seventh embodiment of the voltage regulation circuit provided in this application.

[0033] Figure 17 yes Figure 16 A schematic diagram of the circuit structure corresponding to the working state in the embodiment.

[0034] Figure 18 This is a schematic diagram of an embodiment of the voltage regulating device provided in this application.

[0035] Explanation of icon numbers: 100. Voltage regulating circuit; 1. Shared capacitor module; 2. First voltage regulating module; 3. Second voltage regulating module; 4. Control module; 5. High voltage detection module; 6. Low voltage detection module; S1. First switch; S2. Second switch; S3. Third switch; S4. Fourth switch; S5. Fifth switch; S6. Sixth switch; S7. Seventh switch; S8. Eighth switch; S9. Ninth switch; C1. First capacitor; C2. Second capacitor; C3. Third capacitor; C4. Fourth capacitor; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; R5. Fifth resistor; 61. Comparator; 62. Input buffer; 63. Inverter; 64. Switch.

[0036] 200. Voltage regulating device.

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0041] The present invention proposes a voltage regulating circuit 100 to solve the above-mentioned problems.

[0042] Please see Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of the first embodiment of the voltage regulating circuit provided in this application; in one embodiment of the present invention, the voltage regulating circuit 100 includes: a common capacitor module 1, a first voltage regulating module 2, a second voltage regulating module 3 and a control module 4.

[0043] Specifically, a common capacitor module 1 is configured with its first terminal coupled to the positive terminal of the power supply and its second terminal coupled to the negative terminal. A first voltage regulator module 2 is coupled to both the first and second terminals of the common capacitor module 1, and its output terminal is coupled to the load. A second voltage regulator module 3 is coupled to both the first and second terminals of the common capacitor module 1, and its output terminal is coupled to the load. A control module 4 is coupled to the common capacitor module 1, the first voltage regulator module 2, and the second voltage regulator module 3. The control module 4 controls the boost ratio of the first voltage regulator module 2 and the common capacitor module 1 used as control circuits, and outputs a first target voltage value through the first voltage regulator module 2. The control module 4 also controls the buck ratio of the second voltage regulator module 3 and the common capacitor module 1 used as control circuits, and outputs a second target voltage value through the second voltage regulator module 3.

[0044] The negative terminal of the power supply is grounded, as is the case in the following embodiments, and will not be described in detail hereafter.

[0045] The technical solution of the present invention can complete the corresponding voltage ratio adjustment by using a first voltage regulating module 2 and a second voltage regulating module 3, sharing a common capacitor module 1, thereby obtaining the target voltage, improving the output efficiency of the circuit, and saving costs.

[0046] In one embodiment, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of the second embodiment of the voltage regulating circuit provided in this application; wherein, the voltage regulating circuit 100 further includes: a high voltage detection module 5, the input terminal of the high voltage detection module 5 is coupled to the output terminal of the first voltage regulating module 2, and the output terminal of the high voltage detection module 5 is coupled to the control module 4; wherein, in response to the output voltage value of the first voltage regulating module 2, the high voltage detection module 5 outputs a high voltage feedback signal to the control module 4; the control module 4, in response to the high voltage feedback signal, controls and adjusts the boost ratio of the first voltage regulating module 2 and the shared capacitor module 1, and outputs a first target voltage value.

[0047] Understandably, in the above embodiment, the output level of the first voltage regulating module 2 is detected by the high voltage detection module 5, so as to control the first voltage regulating module 2 and the common capacitor module 1 to execute the corresponding switching strategy according to the output level of the first voltage regulating module 2, so as to realize that the output voltage VCP is the first target voltage value.

[0048] In one embodiment, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the third embodiment of the voltage regulating circuit provided in this application; the voltage regulating circuit 100 further includes: a low-voltage detection module 6, the input terminal of the low-voltage detection module 6 is coupled to the output terminal of the second voltage regulating module 3, and the output terminal of the low-voltage detection module 6 is coupled to the control module 4; wherein, in response to the output voltage value of the second voltage regulating module 3, the low-voltage detection module 6 outputs a low-voltage feedback signal to the control module 4; the control module 4, in response to the low-voltage feedback signal, controls and adjusts the step-down ratio of the second voltage regulating module 3 and the common capacitor module 1, and outputs a second target voltage value.

[0049] Understandably, in the above embodiment, the output level of the second voltage regulating module 3 is detected by the low-voltage detection module 6, so as to control the second voltage regulating module 3 and the common capacitor module 1 to execute the corresponding switching strategy according to the output level of the second voltage regulating module 3, so as to realize that the output voltage VBUCK is the second target voltage value.

[0050] Specifically, the structure and implementation of the low-voltage detection module 6 are as follows: In one embodiment, such as Figure 4 As shown, Figure 4 This is a schematic diagram of an embodiment of the low-voltage detection module provided in this application; the low-voltage detection module 6 includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a switch 64, a comparator 61, an input buffer 62, and an inverter 63. VBUCK is the output voltage of the second voltage regulation module 3, VSH is the output voltage after voltage division, and VBG is the reference voltage source.

[0051] Specifically, the first end of the third resistor R3 is coupled to the output of the second voltage regulating module 3; the first end of the fourth resistor R4 is coupled to the second end of the third resistor R3; the first end of the fifth resistor R5 is coupled to the second end of the fourth resistor R4, and the second end of the fifth resistor R5 is grounded; the first end of the switch 64 is coupled to the first end of the fifth resistor R5, and the second end of the switch 64 is coupled to the second end of the fifth resistor R5; the first input of the comparator 61 is coupled to the first end of the fourth resistor R4, and the second input of the comparator 61 is coupled to the reference voltage source; the input of the input buffer 62 is coupled to the output of the comparator 61; the input of the inverter 63 is coupled to the output of the input buffer 62, and the output of the inverter 63 is coupled to the third end of the switch 64 and the control module 4.

[0052] Understandable. Figure 4 Taking the low-voltage detection module 6 as an example, for the high-voltage detection module 5, in some embodiments, it is related to... Figure 4 The low- and medium-voltage detection modules 6 have the same structure, except for the different resistance values ​​set within them.

[0053] Understandably, the first voltage regulating module 2 and the second voltage regulating module 3 achieve voltage regulation control of the circuit by controlling the on-time of the switch 64, as described in the following embodiment: In one embodiment, such as Figure 5 As shown, Figure 5 This is a schematic diagram of the fourth embodiment of the voltage regulating circuit provided in this application; wherein, the common capacitor module 1 includes: a first capacitor C1, the first end of the first capacitor C1 is coupled to the first end of the first voltage regulating module 2 and the first end of the second voltage regulating module 3, and the second end of the first capacitor C1 is coupled to the second end of the first voltage regulating module 2 and the second end of the second voltage regulating module 3.

[0054] It is understandable that the switches and other devices involved in the shared capacitor module 1, the first voltage regulating module 2, and the second voltage regulating module 3 are all coupled to the control module 4, and the devices are turned on or off through different control strategies. This will not be elaborated on further here.

[0055] Understandable, such as Figure 6 As shown, Figure 6 This is a schematic diagram of the circuit state transition of an embodiment of the voltage regulation circuit provided in this application; the output voltage achieved by the first voltage regulation module 2, namely the first target voltage value VCP = VIN + VDD, where VIN is the input voltage of the power supply and VDD is the voltage value of the boost section. The second voltage regulation module 3 uses a buck-divider strategy to obtain the output voltage VBUCK.

[0056] In the initial state, the circuit first operates the second voltage regulating module 3. When it is detected that the voltage VBUCK output by the second voltage regulating module 3 does not exceed the first threshold voltage V1, the second voltage regulating module 3 continues to operate. When it is detected that the voltage VBUCK output by the second voltage regulating module 3 continues to rise and exceeds the first threshold voltage V1, the voltage VCP output by the first voltage regulating module 2 is detected. It should be noted that the first threshold voltage V1 is greater than VDD.

[0057] When the voltage VCP output by the first voltage regulating module 2 reaches the second threshold voltage V2, where the second threshold voltage V2 = VIN + VDD, the corresponding level signal is output to control the continued operation of the second voltage regulating module 3, and continuously boost the voltage VBUCK output by the second voltage regulating module 3, or keep VBUCK basically unchanged.

[0058] When the voltage VCP output by the first voltage regulating module 2 does not reach the second threshold voltage V2, the corresponding reverse level signal is output to control the first voltage regulating module 2 to continue running, and the voltage value output by the first voltage regulating module 2 is continuously increased. Under the premise of ensuring that VBUCK is greater than the first threshold voltage V1, VCP is increased until the second threshold voltage V2 is reached.

[0059] The specific implementation scheme and working status are shown in the following example: In one embodiment, such as Figure 5 As shown, and in conjunction with the shared capacitor module 1 in the above embodiments, the second voltage regulating module 3 includes: a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a second capacitor C2, and a first resistor R1.

[0060] Specifically, the first terminal of the first switch S1 is coupled to the positive terminal of the power supply, and the second terminal of the first switch S1 is coupled to the first terminal of the shared capacitor module 1; the first terminal of the second switch S2 is coupled to the second terminal of the first switch S1; the first terminal of the third switch S3 is coupled to the second terminal of the second switch S2, and the second terminal of the third switch S3 is coupled to the second terminal of the shared capacitor module 1; the first terminal of the fourth switch S4 is coupled to the second terminal of the third switch S3, and the second terminal of the fourth switch S4 is coupled to the negative terminal of the power supply; the first terminal of the second capacitor C2 is coupled to the second terminal of the third switch S3, and the second terminal of the second capacitor C2 is coupled to the negative terminal of the power supply; the first terminal of the first resistor R1 is coupled to the first terminal of the second capacitor C2, and the second terminal of the first resistor R1 is coupled to the second terminal of the second capacitor C2.

[0061] Combination Figure 5 and Figure 7 As shown, where, Figure 7 yes Figure 5 A schematic diagram of the circuit structure in the step-down operation state of the embodiment is shown below: When the second voltage regulating module 3 is running, the power input voltage VIN first charges the first capacitor C1. Then, when the input voltage is disconnected, the first capacitor C1 charges the second capacitor C2, increasing the output voltage VBUCK. Specifically, in phase φ1, the first capacitor C1 and the second capacitor C2 are connected in series, and the input voltage VIN charges them. Figure 5 With the first switch S1 and the third switch S3 closed, and the other switches open, assuming the voltage across the first capacitor C1 and the second capacitor C2 is Vc, the voltage relationship between the input and output can be expressed by equation (1). In phase φ2, the first capacitor C1 and the second capacitor C2 are connected in parallel, and the first capacitor C1 charges the second capacitor C2, i.e. Figure 5With the second switch S2 and the fourth switch S4 closed and the other switches open, the voltage relationship between the input and output can be expressed by equation (8). According to equations (2) and (3), the relationship between the output voltage VBUCK and the input voltage VIN of the second voltage regulating module 3 can be expressed by equation (3).

[0062]

[0063]

[0064]

[0065] Wherein, VIN is the input voltage of the power supply, Vc is the voltage across the first capacitor C1 and the second capacitor C2, and VBUCK is the output voltage of the second voltage regulating module 3.

[0066] In one embodiment, such as Figure 5 As shown, the first voltage regulating module 2 includes: a second switch S2, a fourth switch S4, a third capacitor C3, a fifth switch S5, a sixth switch S6, and a second resistor R2.

[0067] Specifically, the first terminal of the second switch S2 is coupled to the second terminal of the first switch S1; the first terminal of the fourth switch S4 is coupled to the second terminal of the third switch S3, and the second terminal of the fourth switch S4 is coupled to the negative terminal of the power supply; the first terminal of the third capacitor C3 is coupled to the first terminal of the first switch S1; the first terminal of the fifth switch S5 is coupled to the second terminal of the third capacitor C3, and the second terminal of the fifth switch S5 is coupled to the first terminal of the second switch S2; the first terminal of the sixth switch S6 is coupled to the positive terminal of the power supply, and the second terminal of the sixth switch S6 is coupled to the second terminal of the third switch S3; the first terminal of the second resistor R2 is coupled to the first terminal of the fifth switch S5, and the second terminal of the second resistor R2 is coupled to the negative terminal of the power supply.

[0068] Among them, the second switch S2 and the fourth switch S4 are shared switches of the first voltage regulating module 2 and the second voltage regulating module 3.

[0069] Combination Figure 5 and Figure 8 As shown, where, Figure 8 yes Figure 5 A schematic diagram of the circuit structure in the boost operation state of the embodiment is shown below: The circuit operates in the same state when phase φ3 is equal to phase φ2. Specifically, in phase φ4, the input voltage VIN is connected to the lower terminals of the first capacitor C1 and the third capacitor C3, which are connected in parallel. Figure 5 With the fifth switch S5 and the sixth switch S6 closed and the other switches open, the expression for the output voltage VCP of the first voltage regulating module 2 can be obtained, which is represented by equation (4).

[0070]

[0071] In this circuit, under the control of the high voltage detection module 5 and the low voltage detection module 6, the output voltage VBUCK of the second voltage regulating module 3 is greater than V1, and the output voltage VCP of the first voltage regulating module 2 is basically stable at V2.

[0072] In another implementation architecture, different structures are adopted for the first voltage regulating module 2, the second voltage regulating module 3, and the common capacitor module 1, as follows: In one embodiment, combined with Figure 5 As shown, and see also Figure 9 As shown, Figure 9 This is a schematic diagram of the fifth embodiment of the voltage regulating circuit provided in this application; wherein, by modifying the switching strategy, the voltage regulating circuit can be... Figure 9 The first capacitor C1 and the fourth capacitor C4 are used as a whole and share the capacitor. When the second voltage regulating module 3 is at a 1 / 2 voltage division ratio, the first voltage regulating module 2 and the second voltage regulating module 3 share the capacitor.

[0073] As can be seen from the above, the shared capacitor module 1 further includes, on the original basis, a seventh switch S7 and a fourth capacitor C4; specifically, the first end of the seventh switch S7 is coupled to the second end of the first capacitor C1; the first end of the fourth capacitor C4 is coupled to the second end of the seventh switch S7, and the second end of the fourth capacitor C4 is coupled to the first end of the fourth switch S4.

[0074] The second voltage regulating module 3 also includes an eighth switch S8 and a ninth switch S9; specifically, the first end of the eighth switch S8 is coupled to the positive terminal of the power supply, and the second end of the eighth switch S8 is coupled to the second end of the seventh switch S7; the first end of the ninth switch S9 is coupled to the first end of the seventh switch S7, and the second end of the ninth switch S9 is coupled to the second end of the second switch S2.

[0075] In one embodiment, such as Figure 9 As shown, the first voltage regulating module 2 includes: a second switch S2, a fourth switch S4, a third capacitor C3, a fifth switch S5, a second resistor R2, a sixth switch S6, a seventh switch S7, and an eighth switch S8.

[0076] The first terminal of the second switch S2 is coupled to the second terminal of the first switch S1; the first terminal of the fourth switch S4 is coupled to the second terminal of the third switch S3, and the second terminal of the fourth switch S4 is coupled to the negative terminal of the power supply; the first terminal of the third capacitor C3 is coupled to the first terminal of the first switch S1; the first terminal of the fifth switch S5 is coupled to the second terminal of the third capacitor C3, and the second terminal of the fifth switch S5 is coupled to the first terminal of the second switch S2; the first terminal of the second resistor R2 is coupled to the first terminal of the fifth switch S5, and the second terminal of the second resistor R2 is coupled to the negative terminal of the power supply; the first terminal of the sixth switch S6 is coupled to the positive terminal of the power supply, and the second terminal of the sixth switch S6 is coupled to the first terminal of the fourth switch S4; the first terminal of the eighth switch S8 is coupled to the positive terminal of the power supply, and the second terminal of the eighth switch S8 is coupled to the first terminal of the fourth capacitor C4; wherein, the second switch S2, the fourth switch S4, the seventh switch S7 and the eighth switch S8 are shared switches of the first voltage regulating module 2 and the second voltage regulating module 3.

[0077] In this structure, the first voltage regulating module 2 achieves an output voltage VCP = VIN + VDD, and the second voltage regulating module 3 uses a 2 / 3 voltage divider strategy to obtain the output voltage VBUCK. A key feature of this structure is that the first and second voltage regulating modules 2 and 3 share the first capacitor C1 and the fourth capacitor C4, and the output voltage VBUCK of the second voltage regulating module 3 is used to charge the capacitors in the first voltage regulating module 2. Specifically, a high-voltage detection module 5 is used to achieve the output voltage VCP = VIN + VDD of the first voltage regulating module 2, and a low-voltage detection module 6 is used to ensure that the output voltage VBUCK reaches a specific level. For example... Figure 6 As shown in the circuit state transition diagram, in the initial state, the second voltage regulator module 3 operates first. If the output voltage VBUCK of the second voltage regulator module 3 does not exceed the first threshold voltage V1, then the second voltage regulator module 3 continues to operate, continuously increasing its output voltage VBUCK. If the output voltage VBUCK of the second voltage regulator module 3 exceeds the first threshold voltage V1, then the output voltage VCP of the first voltage regulator module 2 is detected, where V1 > VDD. If the output voltage VCP of the first voltage regulator module 2 reaches V2 = VIN + VDD, then the second voltage regulator module 3 continues to operate, continuously increasing its output voltage VBUCK or ensuring that its output voltage VBUCK remains essentially unchanged. If the output voltage VCP of the first voltage regulator module 2 does not reach the second threshold voltage V2, then the first voltage regulator module 2 operates, continuously increasing its output voltage VCP until it reaches the second threshold voltage V2, while ensuring that the output voltage VBUCK of the second voltage regulator module 3 is greater than V1.

[0078] See Figure 10 As shown, Figure 10 yes Figure 9The circuit structure diagram of the step-down operation in the embodiment is shown below. When the second voltage regulating module 3 is running, the input voltage VIN first charges the two first capacitors C1 and the fourth capacitor C4. Then, the input voltage is disconnected, and the first capacitors C1 and C4 charge the second capacitor C2, increasing the output voltage VBUCK. Specifically, in phase φ1, the first capacitors C1 and C4 are connected in parallel, and then in series with the second capacitor C2. The input voltage VIN charges them. Figure 3 With the first switch S1, the third switch S3, the eighth switch S8, and the ninth switch S9 closed, and the other switches open, assuming the voltage difference between the first capacitor C1 and the fourth capacitor C4 is Vc, the voltage relationship between the input and output can be expressed by equation (5). In phase φ2, the first capacitor C1 and the fourth capacitor C4 are connected in series, and then connected in parallel with the second capacitor C2. The series capacitor charges the second capacitor C2, i.e. Figure 3 With the second switch S2, the fourth switch S4, and the seventh switch S7 closed, and the other switches open, the voltage relationship between the input and output can be expressed by equation (6). According to equations (5) and (6), the relationship between the output voltage VBUCK and the input voltage VIN of the second voltage regulating module 3 can be expressed by equation (7).

[0079]

[0080]

[0081]

[0082] See Figure 11 As shown, Figure 11 yes Figure 9 A schematic diagram of the circuit structure in the boost operation state of the embodiment; wherein, the circuit operates in the same state when φ3 phase is the same as when φ2 phase. Specifically, in the φ4 phase, the input voltage VIN is connected to the lower terminals of the fourth capacitor C4 and the third capacitor C3. The first capacitor C1 and the fourth capacitor C4 are connected in series, and then in parallel with the third capacitor C3, i.e. Figure 9 With the fifth switch S5, the sixth switch S6, and the seventh switch S7 closed, and the other switches open, the expression for the output voltage VCP of the first voltage regulating module 2 can be obtained, which is represented by equation (8).

[0083]

[0084] Where VBUCK > VDD, when VCP = VIN + VDD, the high-voltage detection module 5 will output a control signal to set the first voltage regulating module 2 to the φ3 phase, preventing VCP from rising further. Figure 4As shown, the output voltage VBUCK of the second voltage regulating module 3 is divided by a resistor series, and then VSH and VBG are compared by comparator 61. The comparison result is passed through output buffer and inverter 63 and used to control switch 64 to change the resistor division ratio and realize voltage hysteresis detection. The relationship between VSH and VBUCK when the switch is closed can be expressed by equation (9), and the relationship between VSH and VBUCK when the switch is open can be expressed by equation (10).

[0085]

[0086]

[0087] like Figure 12 As shown, Figure 12 This application Figure 9 The timing diagram corresponds to the first embodiment; under the control of the clock, the output voltage VBUCK of the second voltage regulating module 3 is realized to be greater than V1, and the output voltage VCP of the first voltage regulating module 2 is basically stable at the second threshold voltage V2.

[0088] like Figure 13 As shown, Figure 13 This application Figure 9 The timing diagram corresponds to the second embodiment; the switching timing of the first voltage regulating module 2 and the second voltage regulating module 3 is distinguished by the clock CLK2. The first voltage regulating module 2 works when the clock CLK2=0, and the second voltage regulating module 3 works when the clock CLK2=1, so that the output voltage VBUCK of the second voltage regulating module 3 is greater than V1, and the output voltage VCP of the first voltage regulating module 2 is basically stable at the second threshold voltage V2.

[0089] Based on the principles summarized above, we can conclude that: The circuit uses a common capacitor module 1, namely the first capacitor C1 and the fourth capacitor C4 connected in series, thus saving overall hardware costs.

[0090] The circuit employs a clever structure to share the first capacitor C1 and the fourth capacitor C4, combined with timing control, effectively reducing the additional losses caused by ineffective charging and discharging of the capacitors.

[0091] In one embodiment, combined with Figure 9 and Figure 14 As shown, where, Figure 14 This is a schematic diagram of the sixth embodiment of the voltage regulating circuit provided in this application; the first voltage regulating module 2 includes: a first switch S1, a third switch S3, a third capacitor C3, a fifth switch S5, a second resistor R2, a sixth switch S6 and a seventh switch S7.

[0092] Specifically, the first switch S1 is a common switch for the first voltage regulation module 2 and the second voltage regulation module 3; the first end of the third switch S3 is coupled to the second end of the fourth capacitor C4, and the second end of the third switch S3 is coupled to the first end of the first resistor R1; the first end of the third capacitor C3 is coupled to the first end of the first switch S1; the first end of the fifth switch S5 is coupled to the second end of the third capacitor C3, and the second end of the fifth switch S5 is coupled to the first end of the second switch S2; the first end of the second resistor R2 is coupled to the first end of the fifth switch S5, and the second end of the second resistor R2 is coupled to the negative power supply; the first end of the sixth switch S6 is coupled to the positive power supply, and the second end of the sixth switch S6 is coupled to the first end of the fourth switch S4; the first end of the seventh switch S7 is coupled to the second end of the first capacitor C1, and the second end of the seventh switch S7 is coupled to the second end of the fourth capacitor C4; wherein, the first switch S1, the third switch S3 and the seventh switch S7 are common switches for the first voltage regulation module 2 and the second voltage regulation module 3.

[0093] Wherein, in this embodiment, the timing of the switches is changed, and the grounding end of the first voltage regulation module 2 is changed to the output voltage VBUCK of the second voltage regulation module 3. Wherein, the second voltage regulation module 3 is the same as Figure 9 the embodiment, and the specific working state of the first voltage regulation module 2 is as Figure 15 , Figure 15 is Figure 14 the circuit structure schematic diagram of the corresponding working state in the embodiment solution. Wherein, in the φ3 phase, the first capacitor C1 and the fourth capacitor C4 are in series, and then in series with the second capacitor C2, that is Figure 14 in which the first switch S1, the seventh switch S7 and the third switch S3 are closed, and other switches are open, and the voltage difference of the capacitor charging is Vc = VIN - VBUCK. Wherein, in the φ4 phase, the input voltage VIN is connected to the lower ends of the fourth capacitor C4 and the third capacitor C3, and the first capacitor C1 and the fourth capacitor C4 are in series and then in parallel with the third capacitor C3, that is Figure 14 in which the fifth switch S5, the seventh switch S7 and the sixth switch S6 are closed, and other switches are open, and the expression of the output voltage VCP of the first voltage regulation module 2 can be expressed by Equation (11).

[0094]

[0095] Wherein, the second threshold voltage V2 = VIN + VDD, so when (VIN - VBUCK) < VDD, this scheme does not meet the requirements. Wherein, the switching strategy of the second voltage regulation module 3 can be changed so that VBUCK is the first threshold voltage V1, that is, when VBUCK > V1, control the second voltage regulation module 3 to work in the φ1 phase, so that the output voltage VBUCK of the second voltage regulation module 3 is a specific voltage V1.

[0096] In one embodiment, in combination with Figure 9and Figure 16 As shown, where, Figure 16 This is a schematic diagram of the seventh embodiment of the voltage regulating circuit provided in this application; the first voltage regulating module 2 includes: a first switch S1, a third capacitor C3, a fifth switch S5, a second resistor R2, a fourth switch S4, a sixth switch S6 and a seventh switch S7.

[0097] The first switch S1 is a shared switch for the first voltage regulating module 2 and the second voltage regulating module 3; the first end of the third capacitor C3 is coupled to the first end of the first switch S1; the first end of the fifth switch S5 is coupled to the second end of the third capacitor C3, and the second end of the fifth switch S5 is coupled to the first end of the second switch S2; the first end of the second resistor R2 is coupled to the first end of the fifth switch S5, and the second end of the second resistor R2 is coupled to the negative terminal of the power supply; the first end of the fourth switch S4 is coupled to the second end of the third switch S3, and the second end of the fourth switch S4 is coupled to the negative terminal of the power supply; the first end of the sixth switch S6 is coupled to the positive terminal of the power supply, and the second end of the sixth switch S6 is coupled to the first end of the fourth switch S4; the first end of the seventh switch S7 is coupled to the second end of the first capacitor C1, and the second end of the seventh switch S7 is coupled to the second end of the fourth capacitor C4; wherein, the first switch S1, the fourth switch S4, and the seventh switch S7 are shared switches for the first voltage regulating module 2 and the second voltage regulating module 3.

[0098] In this embodiment, the first voltage regulating module 2 is no longer connected to the output voltage VBUCK of the second voltage regulating module 3. The second voltage regulating module 3 and... Figure 9 The specific operating state of the first voltage regulating module 2 is the same as in the embodiment. Figure 17 , Figure 17 yes Figure 16 A schematic diagram of the circuit structure corresponding to the operating state in the embodiment. Specifically, in phase φ3, the first capacitor C1 and the fourth capacitor C4 are connected in series, and the input VIN charges the capacitors, i.e. Figure 16 When the first switch S1, the seventh switch S7, and the fourth switch S4 are closed, and the other switches are open, the capacitor charging voltage is VIN. Specifically, in phase φ4, the input voltage VIN is connected to the lower terminals of capacitors C4 and C3. Capacitors C1 and C4 are connected in series and then in parallel with capacitor C3. Figure 16 With the fifth switch S5, the seventh switch S7, and the sixth switch S6 closed, and the other switches open, the expression for the output voltage VCP of the first voltage regulating module 2 can be obtained as shown in equation (12).

[0099]

[0100] In this circuit, under the clock control of the high-voltage detection module 5 and the low-voltage detection module 6, the output voltage VBUCK of the second voltage regulating module 3 is greater than V1, and the output voltage VCP of the first voltage regulating module 2 is basically stable at the second threshold voltage V2. This embodiment saves hardware overhead by sharing a capacitor; however, since the first voltage regulating module 2 is not connected to the output voltage VBUCK of the second voltage regulating module 3, the charging and discharging losses of the capacitor are relatively large.

[0101] The present invention also proposes a voltage regulating device 200, such as Figure 18 As shown, Figure 18 This is a schematic diagram of an embodiment of the voltage regulating device provided in this application; the voltage regulating device 200 includes a voltage regulating circuit 100, the specific structure of which is described in the above embodiment. Since the voltage regulating device 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0102] In the embodiments of the present invention, the first voltage regulating module 2 and the second voltage regulating module 3 are used in combination and share a common capacitor module 1 to complete the corresponding boost or buck adjustment, obtain the target voltage, save device costs, reduce resource occupation, and improve the output efficiency of the circuit.

[0103] The above are merely exemplary embodiments of the present invention and do not limit the scope of the patent of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A voltage regulating circuit, characterized in that, The voltage regulation circuit includes: A shared capacitor module, wherein the first end of the shared capacitor module is coupled to the positive terminal of the power supply, and the second end of the shared capacitor module is coupled to the negative terminal of the power supply. A first voltage regulating module is coupled to the first and second terminals of the common capacitor module, and the output terminal of the first voltage regulating module is coupled to the load. The second voltage regulating module is coupled to the first and second terminals of the common capacitor module, and the output terminal of the second voltage regulating module is coupled to the load. The control module is coupled to the shared capacitor module, the first voltage regulating module, and the second voltage regulating module; The control module controls the first voltage regulating module and the shared capacitor module to be used as the boost ratio of the control circuit, and outputs a first target voltage value through the first voltage regulating module; the control module controls the second voltage regulating module and the shared capacitor module to be used as the buck ratio of the control circuit, and outputs a second target voltage value through the second voltage regulating module.

2. The voltage regulating circuit as described in claim 1, characterized in that, The voltage regulation circuit also includes: A high-voltage detection module, wherein the input terminal of the high-voltage detection module is coupled to the output terminal of the first voltage regulating module, and the output terminal of the high-voltage detection module is coupled to the control module; The high-voltage detection module responds to the output voltage value of the first voltage regulating module and outputs a high-voltage feedback signal to the control module; the control module responds to the high-voltage feedback signal, controls and adjusts the boost ratio of the first voltage regulating module and the shared capacitor module, and outputs a first target voltage value.

3. The voltage regulating circuit as described in claim 1 or 2, characterized in that, The voltage regulation circuit also includes: A low-voltage detection module, wherein the input terminal of the low-voltage detection module is coupled to the output terminal of the second voltage regulating module, and the output terminal of the low-voltage detection module is coupled to the control module; The low-voltage detection module responds to the output voltage value of the second voltage regulating module and outputs a low-voltage feedback signal to the control module; the control module responds to the low-voltage feedback signal, controls and adjusts the step-down ratio of the second voltage regulating module and the shared capacitor module, and outputs a second target voltage value.

4. The voltage regulating circuit as described in claim 3, characterized in that, The shared capacitor module includes: A first capacitor, the first end of which is coupled to the first end of the first voltage regulating module and the first end of the second voltage regulating module, and the second end of which is coupled to the second end of the first voltage regulating module and the second end of the second voltage regulating module.

5. The voltage regulating circuit as described in claim 4, characterized in that, The second voltage regulating module includes: A first switch, the first end of which is coupled to the positive terminal of the power supply, and the second end of which is coupled to the first end of the shared capacitor module. A second switch, wherein the first end of the second switch is coupled to the second end of the first switch; A third switch, the first end of which is coupled to the second end of the second switch, and the second end of the third switch is coupled to the second end of the shared capacitor module; The fourth switch has a first terminal coupled to the second terminal of the third switch, and the second terminal of the fourth switch is coupled to the negative terminal of the power supply. The second capacitor has a first terminal coupled to the second terminal of the third switch, and the second terminal of the second capacitor is coupled to the negative terminal of the power supply. A first resistor, the first end of which is coupled to the first end of the second capacitor, and the second end of which is coupled to the second end of the second capacitor.

6. The voltage regulating circuit as described in claim 5, characterized in that, The first voltage regulating module includes: A second switch, wherein the first end of the second switch is coupled to the second end of the first switch; The fourth switch has a first terminal coupled to the second terminal of the third switch, and the second terminal of the fourth switch is coupled to the negative terminal of the power supply. A third capacitor, the first terminal of which is coupled to the first terminal of the first switch; The fifth switch, the first end of which is coupled to the second end of the third capacitor, and the second end of the fifth switch is coupled to the first end of the second switch; The sixth switch has its first end coupled to the positive terminal of the power supply and its second end coupled to the second end of the third switch. The second resistor has a first end coupled to the first end of the fifth switch and a second end coupled to the negative terminal of the power supply. The second switch and the fourth switch are shared switches between the first voltage regulating module and the second voltage regulating module.

7. The voltage regulating circuit as described in claim 5, characterized in that, The shared capacitor module also includes: The seventh switch, wherein the first end of the seventh switch is coupled to the second end of the first capacitor; A fourth capacitor, the first terminal of which is coupled to the second terminal of the seventh switch, and the second terminal of the fourth capacitor is coupled to the first terminal of the fourth switch; The second voltage regulating module also includes: The eighth switch has its first terminal coupled to the positive terminal of the power supply and its second terminal coupled to the second terminal of the seventh switch. A ninth switch, wherein the first end of the ninth switch is coupled to the first end of the seventh switch, and the second end of the ninth switch is coupled to the second end of the second switch.

8. The voltage regulating circuit as described in claim 7, characterized in that, The first voltage regulating module includes: A second switch, wherein the first end of the second switch is coupled to the second end of the first switch; The fourth switch has a first terminal coupled to the second terminal of the third switch, and the second terminal of the fourth switch is coupled to the negative terminal of the power supply. A third capacitor, the first terminal of which is coupled to the first terminal of the first switch; The fifth switch, the first end of which is coupled to the second end of the third capacitor, and the second end of the fifth switch is coupled to the first end of the second switch; The second resistor has a first end coupled to the first end of the fifth switch and a second end coupled to the negative terminal of the power supply. The sixth switch has its first end coupled to the positive terminal of the power supply and its second end coupled to the first end of the fourth switch. The seventh switch, the first end of which is coupled to the second end of the first capacitor, and the second end of the seventh switch is coupled to the first end of the fourth capacitor; The eighth switch, the first end of which is coupled to the positive terminal of the power supply, and the second end of which is coupled to the first end of the fourth capacitor; The second switch, the fourth switch, the seventh switch, and the eighth switch are shared switches between the first voltage regulating module and the second voltage regulating module.

9. The voltage regulating circuit as described in claim 7, characterized in that, The first voltage regulating module includes: The first switch is a shared switch for the first voltage regulating module and the second voltage regulating module; The third switch has its first terminal coupled to the second terminal of the fourth capacitor, and its second terminal coupled to the first terminal of the first resistor. A third capacitor, the first terminal of which is coupled to the first terminal of the first switch; The fifth switch, the first end of which is coupled to the second end of the third capacitor, and the second end of the fifth switch is coupled to the first end of the second switch; The second resistor has a first end coupled to the first end of the fifth switch and a second end coupled to the negative terminal of the power supply. The sixth switch, the first end of which is coupled to the positive terminal of the power supply, and the second end of which is coupled to the first end of the fourth switch; A seventh switch, the first end of which is coupled to the second end of the first capacitor, and the second end of the seventh switch is coupled to the second end of the fourth capacitor; The first switch, the third switch, and the seventh switch are shared switches for the first voltage regulating module and the second voltage regulating module.

10. The voltage regulating circuit as described in claim 7, characterized in that, The first voltage regulating module includes: The first switch is a shared switch for the first voltage regulating module and the second voltage regulating module; A third capacitor, the first terminal of which is coupled to the first terminal of the first switch; The fifth switch, the first end of which is coupled to the second end of the third capacitor, and the second end of the fifth switch is coupled to the first end of the second switch; The second resistor has a first end coupled to the first end of the fifth switch and a second end coupled to the negative terminal of the power supply. The fourth switch has a first terminal coupled to the second terminal of the third switch, and the second terminal of the fourth switch is coupled to the negative terminal of the power supply. The sixth switch, the first end of which is coupled to the positive terminal of the power supply, and the second end of which is coupled to the first end of the fourth switch; A seventh switch, the first end of which is coupled to the second end of the first capacitor, and the second end of the seventh switch is coupled to the second end of the fourth capacitor; The first switch, the fourth switch, and the seventh switch are shared switches for the first voltage regulating module and the second voltage regulating module.

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