Voltage regulating chip and switching power supply

Abstract

The invention discloses a voltage regulating chip and a switching power supply. The voltage regulating chip comprises a voltage input end, a first driving module, a second driving module and a main control module, the voltage input end is used for accessing an input voltage. The first driving module is used for generating and outputting a first driving signal based on an input voltage. The second driving module is used for generating and outputting a second driving signal based on the input voltage. The first driving signal and the second driving signal are used for driving the corresponding voltage regulating circuits respectively. The main control module is used for controlling the first driving module and the second driving module to output a first driving signal and a second driving signal respectively. The first driving module and the second driving module are integrated in the voltage regulating chip, so that the requirement on a peripheral circuit can be reduced, and the electromagnetic interference of the whole circuit to the outside can be reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of power supply, and in particular, relates to a voltage regulating chip and a switching power supply. Background Art

[0002] At present, with the development of basic materials, the continuous improvement of integrated circuit technology and semiconductor processes, people have higher and higher requirements for the size and functions of electronic devices. With the widespread application of electronic devices such as wearable devices and portable devices, the market has put forward higher requirements for power management chips. Among them, switching power supplies are widely used due to their small size, light weight, high efficiency, and few peripheral devices. However, with the strict requirements of newly derived application scenarios and the fierce competition in the market, traditional switching power supplies have shown their shortcomings, especially the complex peripheral circuits of traditional switching power supply chips generally have the problem of excessive electromagnetic interference. Summary of the invention

[0003] The purpose of the present application is to provide a voltage regulating chip and a switching power supply, aiming to solve the problem of excessive electromagnetic interference commonly existing in the complex peripheral circuits of traditional switching power supply chips.

[0004] A first aspect of an embodiment of the present application provides a voltage regulating chip, including: a voltage input terminal for connecting an input voltage; a first driving module, the first driving module is used to generate and output a first driving signal based on the input voltage; a second driving module, the second driving module is used to generate and output a second driving signal based on the input voltage; the first driving signal and the second driving signal are used to drive corresponding voltage regulating circuits respectively; and a main control module, the main control module is used to control the first driving module and the second driving module to output the first driving signal and the second driving signal respectively.

[0005] In one embodiment, the phase difference between the first driving signal and the second driving signal is 180°.

[0006] In one embodiment, the voltage regulating circuit is a synchronous DC voltage regulating circuit.

[0007] In one embodiment, the voltage regulating circuit includes a high-side switch tube, a low-side switch tube and a first capacitor, and the output end of the high-side switch tube is respectively connected to the input end of the low-side switch tube and the first end of the first capacitor; the first driving module includes a first bootstrap voltage end, a second bootstrap voltage end, a first driving unit and a second driving unit; the first bootstrap voltage end is connected to the voltage input end, the first bootstrap voltage end is used to be connected to the second end of the first capacitor, the second bootstrap voltage end is connected to the ground end of the first driving unit, and the second bootstrap voltage end is used to be connected to the first end of the first capacitor; the input end of the first driving unit is connected to the main control module, and the output end of the first driving unit is used to be connected to the control end of the high-side switch tube; the input end of the second driving unit is connected to the main control module, and the output end of the second driving unit is used to be connected to the control end of the low-side switch tube; the main control module is used to control the first driving unit and the second driving unit to generate and output the first driving signal based on the input voltage; the circuit of the second driving module is the same as that of the first driving module.

[0008] In one embodiment, a voltage stabilizing unit is further included. The voltage stabilizing unit is connected between the voltage input terminal and the first driving unit and the second driving unit. The voltage stabilizing unit is used to stabilize the input voltage.

[0009] In one embodiment, a protection unit is further included. The protection unit is connected between the voltage input terminal and the first driving unit and the second driving unit. The protection unit is used for overvoltage protection.

[0010] A second aspect of an embodiment of the present application provides a switching power supply, comprising a voltage regulating chip as described above and a plurality of voltage regulating circuits, wherein the voltage regulating chip is connected to each of the voltage regulating circuits.

[0011] In one embodiment, some of the voltage regulating circuits include a first step-down circuit and a second step-down circuit; the first step-down circuit is connected to a first driving module of the voltage regulating chip, and the first step-down circuit is used to output a first output voltage based on the input voltage and according to a first driving signal output by the first driving module; the second step-down circuit is connected to a second driving module of the voltage regulating chip, and the second step-down circuit is used to output a second output voltage based on the input voltage and according to a second driving signal output by the second driving module.

[0012] In one embodiment, the output end of the first step-down circuit is connected to the output end of the second step-down circuit.

[0013] In one embodiment, some of the voltage regulating circuits include an H-bridge voltage regulating circuit; the H-bridge voltage regulating circuit is respectively connected to the first driving module and the second driving module of the voltage regulating chip, and the H-bridge voltage regulating circuit is used to output a third output voltage based on the input voltage, according to the first driving signal output by the first driving module and the second driving signal output by the second driving module.

[0014] Compared with the prior art, the embodiments of the present application have the following beneficial effects: by integrating the first driving module and the second driving module in one chip, the demand for peripheral circuits can be reduced, thereby reducing the electromagnetic interference of the overall circuit to the outside world.

[0015] At the same time, by making the phase difference between the first driving signal and the second driving signal 180°, the magnetic fields generated by the two corresponding voltage regulating circuits can cancel each other out, further reducing the electromagnetic interference of the overall circuit to the outside world. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a voltage regulator chip provided in an embodiment of the present application;

[0017] Figure 2 A circuit diagram of a voltage regulating chip and a voltage regulating circuit provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of a switching power supply provided in an embodiment of the present application;

[0019] Figure 4 A circuit diagram of a switching power supply provided in one embodiment of the present application;

[0020] Figure 5 Another circuit diagram of a switching power supply provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0023] In addition, 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.

[0024] Figure 1 A schematic diagram of a voltage regulator chip provided in an embodiment of the present application is shown. For ease of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0025] The voltage regulating chip 10 includes: a voltage input terminal VIN, a first driving module 100 , a second driving module 200 and a main control module 300 .

[0026] The voltage input terminal VIN is used to connect the input voltage. The first driving module 100 is used to generate and output a first driving signal based on the input voltage. The second driving module 200 is used to generate and output a second driving signal based on the input voltage. The first driving signal and the second driving signal are used to drive the corresponding voltage regulating circuits respectively. The main control module 300 is used to control the first driving module 100 and the second driving module 200 to output the first driving signal and the second driving signal respectively.

[0027] By integrating the first driving module 100 and the second driving module 200 in one voltage regulating chip 10 , the demand for peripheral circuits can be reduced, thereby reducing the electromagnetic interference of the overall circuit to the outside world.

[0028] The main control module 300 may also be connected to an input voltage and use the input voltage as the working voltage of the main control module 300. The main control module 300 may include a field programmable gate array (FPGA), an integrated circuit and other logic control modules. The first driving module 100 and the second driving module 200 may specifically include a driver, which is used to output a corresponding driving signal according to the voltage of the working voltage terminal and the ground terminal under the control of the main control module 300.

[0029] In one embodiment, the phase difference between the first driving signal and the second driving signal is 180°.

[0030] By making the phase difference between the first driving signal and the second driving signal 180°, the magnetic fields generated by the two corresponding voltage regulating circuits can cancel each other out, further reducing the electromagnetic interference of the overall circuit to the outside world.

[0031] It is understandable that when there are multiple voltage regulating circuits, the PCB layout of the voltage regulating circuits can be adaptively adjusted so that the magnetic fields generated by the multiple voltage regulating circuits cancel each other out.

[0032] In one embodiment, the voltage regulating circuit is a synchronous DC voltage regulating circuit.

[0033] A synchronous DC voltage regulator circuit requires at least two switching tubes. By controlling the on and off of the two switching tubes, voltage regulation can be achieved. A synchronous DC voltage regulator circuit usually uses two MOS tubes. The on-resistance of the MOS tube is lower, and electrical energy can be output more efficiently.

[0034] In one embodiment, if Figure 2 As shown, the voltage regulating circuit includes a high-side switch tube, a low-side switch tube and a first capacitor C1, and the output end of the high-side switch tube is connected to the input end of the low-side switch tube and the first end of the first capacitor C1 respectively. Among them, the high-side switch tube and the low-side switch tube can both be N-type MOS tubes.

[0035] It should be noted that Figure 2 The two voltage regulating circuits shown are a first buck circuit 21 and a second buck circuit 22. Taking the first buck circuit 21 as an example, the high-side switch tube and the low-side switch tube of the first buck circuit 21 are a first switch tube Q1 and a second switch tube Q2 respectively.

[0036] The first driving module 100 includes a first bootstrap voltage terminal BST1 , a second bootstrap voltage terminal SW1 , a first driving unit U1 , and a second driving unit U2 .

[0037] The first bootstrap voltage terminal BST1 is connected to the voltage input terminal VIN, the first bootstrap voltage terminal BST1 is used to connect to the second end of the first capacitor C1, the second bootstrap voltage terminal SW1 is connected to the ground terminal of the first drive unit U1, and the second bootstrap voltage terminal SW1 is used to connect to the first end of the first capacitor C1. The input end of the first drive unit U1 is connected to the main control module 300, and the output end of the first drive unit U1 is used to connect to the control end of the high-side switch tube. The input end of the second drive unit U2 is connected to the main control module 300, and the output end of the second drive unit U2 is used to connect to the control end of the low-side switch tube. The main control module 300 is used to control the first drive unit U1 and the second drive unit U2 to generate and output a first drive signal based on the input voltage. The circuit of the second drive module 200 is the same as the first drive module 100.

[0038] The first driving unit U1 and the second driving unit U2 can control the on and off of the high-side switch tube and the low-side switch tube respectively, and by controlling the ratio between the on time and the off time of the high-side switch tube and the low-side switch tube, the effect of adjusting the voltage output by the voltage regulating circuit can be achieved. The first driving unit U1 and the second driving unit U2 may include a controller, an operational amplifier unit or an integrated circuit, etc.

[0039] It should be noted that, in order to turn on the high-side switch tube, after stabilizing the voltage of the second bootstrap voltage terminal SW1 through the first capacitor C1, the second bootstrap voltage terminal SW1 is connected to the ground terminal of the first drive unit U1, so that the first drive unit U1 can output a sufficiently high voltage to drive the high-side switch tube to turn on.

[0040] In some embodiments, the first driving module 100 further includes a first diode D1 , which is connected between the working voltage terminal VCC and the voltage input terminal VIN of the first driving unit U1 to achieve unidirectional transmission of the input voltage to the first driving module 100 .

[0041] In one embodiment, if Figure 2 As shown, the voltage regulating chip 10 further includes a voltage stabilizing unit 400 . The voltage stabilizing unit 400 is connected between the voltage input terminal VIN and the first driving unit U1 and the second driving unit U2 . The voltage stabilizing unit 400 is used to stabilize the input voltage.

[0042] By stabilizing the input voltage through the voltage stabilizing unit 400, the first driving unit U1 and the second driving unit U2 can work more stably, thereby improving the stability of the entire circuit.

[0043] The voltage stabilizing unit 400 may specifically include a regulator.

[0044] In some embodiments, the voltage regulating chip 10 also includes a working voltage terminal VCC, which is connected to the output terminal of the voltage stabilizing unit 400. It can be understood that the input voltage stabilized by the voltage stabilizing unit 400 can be used as the working voltage, and the working voltage is obtained by connecting to the working voltage terminal VCC.

[0045] The working voltage terminal VCC can also be connected to the high-side switch tube of the voltage regulation circuit to provide the working voltage.

[0046] In some embodiments, the voltage stabilizing unit 400 may also be connected to the main control module 300 to provide an input voltage to the main control module 300 .

[0047] In one embodiment, if Figure 2 As shown, the voltage regulating chip 10 further includes a protection unit 500 . The protection unit 500 is connected between the voltage input terminal VIN and the first driving unit U1 and the second driving unit U2 . The protection unit 500 is used for overvoltage protection.

[0048] The protection unit 500 can protect the voltage regulator chip 10 and can be turned on when the input voltage is too high to ground the voltage input terminal VIN to achieve overvoltage protection or electrostatic protection.

[0049] In some embodiments, the protection unit 500 includes a voltage stabilizing diode ESD, an anode of the voltage stabilizing diode ESD is grounded, and a cathode of the voltage stabilizing diode ESD is connected to the working voltage terminal VCC.

[0050] In one embodiment, if Figure 2 As shown, the voltage regulating chip 10 further includes an oscillator 600 , which is connected to the main control module 300 and is used to provide a clock signal.

[0051] Figure 3 A schematic diagram of a switching power supply provided by an embodiment of the present application is shown. For ease of explanation, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0052] The switching power supply 30 includes a voltage regulating chip 10 and a plurality of voltage regulating circuits 20 as described in any of the above embodiments. The voltage regulating chip 10 is connected to each of the voltage regulating circuits 20 .

[0053] By controlling multiple voltage regulating circuits 20 to output electrical energy through a voltage regulating chip 10, the number and complexity of components in related peripheral circuits can be reduced, thereby reducing electromagnetic radiation and reducing external interference.

[0054] In one embodiment, if Figure 2 As shown, the plurality of voltage regulating circuits 20 include a first buck circuit 21 and a second buck circuit 22. The first buck circuit 21 is connected to the first driving module 100 of the voltage regulating chip 10, and the first buck circuit 21 is used to output a first output voltage VOUT1 based on an input voltage and a first driving signal output by the first driving module 100. The second buck circuit 22 is connected to the second driving module 200 of the voltage regulating chip 10, and the second buck circuit 22 is used to output a second output voltage VOUT2 based on an input voltage and a second driving signal output by the second driving module 200.

[0055] The first buck circuit 21 and the second buck circuit 22 may be buck circuits with the same circuit structure.

[0056] Taking the first step-down circuit 21 as an example, in some embodiments, Figure 2 As shown, the first step-down circuit 21 includes a first switch tube Q1, a second switch tube Q2, a first inductor L1, a first capacitor C1, a second capacitor C2 and a third capacitor C3.

[0057] The first end of the first switch tube Q1 is connected to the working voltage terminal VCC, the second end of the first switch tube Q1 is respectively connected to the first end of the second switch tube Q2, the first end of the first capacitor C1, the second bootstrap voltage terminal SW1 of the first driving module 100, and the first end of the first inductor L1, and the control end of the first switch tube Q1 is connected to the output end of the first driving unit U1 of the first driving module 100.

[0058] The second end of the second switch tube Q2 is grounded, the control end of the second switch tube Q2 is connected to the output end of the second drive unit U2 of the first drive module 100, the second end of the first capacitor C1 is connected to the first bootstrap voltage end BST1 of the first drive module 100, and the second end of the first inductor L1 is the output end of the first buck circuit 21.

[0059] The first end of the second capacitor C2 is connected to the first end of the first switch tube Q1, and the second end of the second capacitor C2 is grounded. The first end of the third capacitor C3 is connected to the second end of the first inductor L1, and the second end of the third capacitor C3 is grounded.

[0060] Wherein, the first switch tube Q1 and the second switch tube Q2 are both N-type MOS tubes.

[0061] It can be understood that by controlling the on and off of the first switch tube Q1 and the second switch tube Q2 through the first driving signal, the first output voltage VOUT1 can be generated and output based on the input voltage provided by the voltage input terminal VIN.

[0062] It can be understood that the difference between the second buck circuit 22 and the first buck circuit 21 is that the control ends of the two switch tubes of the second buck circuit 22 are respectively connected to the second driving module 200 to output the second output voltage VOUT2 according to the second driving signal.

[0063] In one embodiment, if Figure 4 As shown, the output end of the first step-down circuit 21 is connected to the output end of the second step-down circuit 22 .

[0064] By connecting the output ends of the two buck circuits together, dual-path parallel interleaved output can be achieved, and the first buck circuit 21 and the second buck circuit 22 can also achieve parallel current sharing. At this time, the first output voltage VOUT1 is equal to the second output voltage VOUT2.

[0065] When the phase difference between the first drive signal and the second drive signal is 180°, the two inductor current ripples generated by the first buck circuit 21 and the second buck circuit 22 can offset each other, and only a smaller capacitor is needed to meet the demand for small ripples, while improving the dynamic response.

[0066] After a reasonable PCB layout, magnetic field offset can be achieved to reduce external interference, making it easier to pass the electromagnetic radiation certification test.

[0067] In one embodiment, if Figure 5As shown, the plurality of voltage regulating circuits 20 include an H-bridge voltage regulating circuit 23. The H-bridge voltage regulating circuit 23 is respectively connected to the first driving module 100 and the second driving module 200 of the voltage regulating chip 10, and the H-bridge voltage regulating circuit 23 is used to output a third output voltage VOUT3 based on the input voltage, according to the first driving signal output by the first driving module 100 and the second driving signal output by the second driving module 200.

[0068] Exemplarily, in some embodiments, the H-bridge voltage regulating circuit 23 includes a third switch tube Q5, a fourth switch tube Q6, a fifth switch tube Q7, a sixth switch tube Q8, a fourth capacitor C7, a fifth capacitor C8, a sixth capacitor C9, a seventh capacitor C10 and a second inductor L3.

[0069] A first end of the third switch tube Q5 is connected to the voltage input end VIN, a second end of the third switch tube Q5 is respectively connected to a first end of the fourth switch tube Q6, a first end of the fourth capacitor C7, a second bootstrap voltage end SW1 of the first driving module 100, and a first end of the second inductor L3, and a control end of the third switch tube Q5 is connected to an output end of the first driving unit U1 of the first driving module 100.

[0070] A second end of the fourth switch tube Q6 is grounded, a control end of the fourth switch tube Q6 is connected to the output end of the second drive unit U2 of the first drive module 100 , and a second end of the fourth capacitor C7 is connected to the first bootstrap voltage end BST1 of the first drive module 100 .

[0071] A first end of the fifth capacitor C8 is connected to the first end of the third switch tube Q5 , and a second end of the fifth capacitor C8 is grounded.

[0072] A first end of the fifth switch tube Q7 is connected to the output end of the H-bridge voltage regulating circuit 23, a second end of the fifth switch tube Q7 is respectively connected to the first end of the sixth switch tube Q8, the first end of the sixth capacitor C9, the fourth bootstrap voltage terminal SW2 of the second driving module 200, and the second end of the second inductor L3, and a control end of the fifth switch tube Q7 is connected to the output end of the third driving unit U3 of the second driving module 200.

[0073] A second end of the sixth switch tube Q8 is grounded, a control end of the sixth switch tube Q8 is connected to the output end of the fourth drive unit U4 of the second drive module 200 , and a second end of the sixth capacitor C9 is connected to the third bootstrap voltage end BST2 of the second drive module 200 .

[0074] At this time, the switching power supply 30 can achieve the requirement that the output voltage is higher, equal to or lower than the input voltage. The system can be smoothly switched between boost, buck and boost / buck states, ensuring the stability and reliability of the switching power supply 30. At the same time, the switching power supply 30 can use frequency jittering technology, making it easier to pass the electromagnetic radiation certification test. The H-bridge voltage regulator circuit 23 can be applied to Type-C charging application scenarios.

[0075] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0076] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0077] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A voltage regulating chip, characterized in that: include: Voltage input terminal, used for connecting input voltage; A first driving module, the first driving module is used to generate and output a first driving signal based on the input voltage; a second driving module, the second driving module being configured to generate and output a second driving signal based on the input voltage; The first driving signal and the second driving signal are used to drive corresponding voltage regulating circuits respectively; A main control module, wherein the main control module is used to control the first driving module and the second driving module to output the first driving signal and the second driving signal respectively.

2. The voltage regulating chip according to claim 1, characterized in that: The phase difference between the first driving signal and the second driving signal is 180°.

3. The voltage regulating chip according to claim 1, characterized in that: The voltage regulating circuit is a synchronous DC voltage regulating circuit.

4. The voltage regulating chip according to claim 3, characterized in that: The voltage regulating circuit comprises a high-side switch tube, a low-side switch tube and a first capacitor, wherein the output end of the high-side switch tube is respectively connected to the input end of the low-side switch tube and the first end of the first capacitor; The first driving module includes a first bootstrap voltage terminal, a second bootstrap voltage terminal, a first driving unit and a second driving unit; The first bootstrap voltage terminal is connected to the voltage input terminal, the first bootstrap voltage terminal is used to connect to the second terminal of the first capacitor, the second bootstrap voltage terminal is connected to the ground terminal of the first driving unit, and the second bootstrap voltage terminal is used to connect to the first terminal of the first capacitor; The input end of the first driving unit is connected to the main control module, and the output end of the first driving unit is used to connect to the control end of the high-side switch tube; the input end of the second driving unit is connected to the main control module, and the output end of the second driving unit is used to connect to the control end of the low-side switch tube; The main control module is used to control the first driving unit and the second driving unit to generate and output the first driving signal based on the input voltage; The circuit of the second driving module is the same as that of the first driving module.

5. The voltage regulating chip according to any one of claims 1 to 4, characterized in that: It also includes a voltage stabilizing unit, which is connected between the voltage input terminal and the first driving unit and the second driving unit, and is used to stabilize the input voltage.

6. The voltage regulating chip according to any one of claims 1 to 4, characterized in that: It also includes a protection unit, which is connected between the voltage input terminal and the first driving unit and the second driving unit, and is used for overvoltage protection.

7. A switching power supply, characterized in that: It comprises the voltage regulating chip as claimed in any one of claims 1 to 6 and a plurality of voltage regulating circuits, wherein the voltage regulating chip is connected to each of the voltage regulating circuits.

8. The switching power supply according to claim 7, characterized in that: Some of the voltage regulating circuits include a first step-down circuit and a second step-down circuit; The first step-down circuit is connected to a first driving module of the voltage regulating chip, and the first step-down circuit is used to output a first output voltage based on the input voltage and according to a first driving signal output by the first driving module; The second step-down circuit is connected to the second driving module of the voltage regulating chip, and the second step-down circuit is used for outputting a second output voltage based on the input voltage and according to a second driving signal output by the second driving module.

9. The switching power supply according to claim 8, characterized in that: The output end of the first step-down circuit is connected to the output end of the second step-down circuit.

10. The switching power supply according to claim 7, characterized in that: Some of the voltage regulating circuits include an H-bridge voltage regulating circuit; The H-bridge voltage regulating circuit is connected to the first driving module and the second driving module of the voltage regulating chip respectively, and the H-bridge voltage regulating circuit is used to output a third output voltage based on the input voltage according to the first driving signal output by the first driving module and the second driving signal output by the second driving module.

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