Voltage regulating circuit and voltage regulator

Abstract

The embodiment of the present invention provides a voltage regulation circuit and a voltage regulator, which are used to simultaneously realize the functions of voltage boost and voltage reduction, simplify the circuit structure, reduce the cost, and reduce the size of the voltage regulator. The circuit includes: a first voltage input terminal, a second voltage input terminal, a first voltage output terminal, a second voltage output terminal, and a first switch tube bridge arm, a capacitor branch, and a second switch tube bridge arm connected in parallel, the capacitor branch includes a first capacitor and a second capacitor connected in series, the second voltage input terminal is connected to the second voltage output terminal, a third capacitor and a fourth capacitor are connected in series between the second voltage input terminal and the first voltage output terminal, the first voltage input terminal is connected to a first node and a second node respectively, a first inductor is connected between the connection point of the second voltage input terminal and the third capacitor and the third node, and a second inductor is connected between the connection point of the first voltage output terminal and the fourth capacitor and the fourth node.

Description

Technical Field

[0001] The present invention relates to the field of AC voltage regulators, and in particular to a voltage regulating circuit and a voltage regulator. Background Art

[0002] Voltage regulators are generally used in scientific research, experiments, testing, heating and insulation, soft starting and other occasions to provide different voltages to the load and enable the voltage to be linearly adjusted when power is on.

[0003] In the prior art, there are three common methods for implementing AC voltage regulators: the first is a contact transformer voltage regulator structure, which uses a servo motor to drive the brush to move to achieve the change of the transformer turns ratio and achieve the purpose of adjusting the AC output voltage. However, due to the existence of the brush, it is easy to wear and lead to poor contact or voltage regulation is easy to produce electric sparks, which leads to slow voltage adjustment response and requires frequent maintenance. In addition, due to the existence of the transformer, the voltage regulator is heavy and large in size. The second is a contactless transformer voltage regulator structure, which uses a thyristor as an electronic switch to adjust the transformer output voltage. However, because the voltage regulation is step-by-step, continuous voltage regulation cannot be achieved, so there is a disadvantage of low output accuracy. In addition, the transformer still exists, and the voltage regulator is still heavy and large in size. The third is a transformerless structure, some of which use a switch tube high-frequency chopping method to achieve AC voltage regulation. Most of these voltage regulators can only reduce voltage but not achieve a boost function, or can only achieve a boost but not a step-down function. Although some can achieve boost and buck at the same time, the circuit is complex, with many inductors and electron tubes, and there are disadvantages of high cost and large size.

[0004] In summary, the AC voltage regulator in the prior art has the problems of being unable to achieve voltage boost and voltage reduction at the same time, having a complex circuit, high cost, and large size. Summary of the invention

[0005] The embodiments of the present invention provide a voltage regulation circuit and a voltage regulator, which are used to simultaneously realize the functions of voltage boost and voltage reduction, simplify the circuit structure, reduce the cost, and reduce the size of the voltage regulator.

[0006] In a first aspect, an embodiment of the present invention provides a voltage regulating circuit, comprising: a first voltage input terminal, a second voltage input terminal, a first voltage output terminal, a second voltage output terminal, and a first switch tube bridge arm, a capacitor branch, and a second switch tube bridge arm connected in parallel, the capacitor branch comprises a first capacitor and a second capacitor connected in series, the second voltage input terminal is connected to the second voltage output terminal, a third capacitor and a fourth capacitor are connected in series between the second voltage input terminal and the first voltage output terminal, the first voltage input terminal is respectively connected to a first node and a second node, a first inductor is connected between a connection point between the second voltage input terminal and the third capacitor and the third node, and a second inductor is connected between a connection point between the first voltage output terminal and the fourth capacitor and the fourth node;

[0007] Among them, the first node is the middle node of the first capacitor and the second capacitor, the second node is the middle node of the third capacitor and the fourth capacitor, the third node is the middle node of the two switch tubes connected in series in the first switch tube bridge arm, and the fourth node is the middle node of the two switch tubes connected in series in the second switch tube bridge arm.

[0008] The voltage regulating circuit provided by the embodiment of the present invention includes: a first voltage input terminal, a second voltage input terminal, a first voltage output terminal, a second voltage output terminal, and a first switch tube bridge arm, a capacitor branch and a second switch tube bridge arm connected in parallel, the capacitor branch includes a first capacitor and a second capacitor connected in series, the second voltage input terminal is connected to the second voltage output terminal, a third capacitor and a fourth capacitor are connected in series between the second voltage input terminal and the first voltage output terminal, the first voltage input terminal is connected to the first node and the second node respectively, a first inductor is connected between the connection point between the second voltage input terminal and the third capacitor and the third node, and a second inductor is connected between the connection point between the first voltage output terminal and the fourth capacitor and the fourth node. Compared with the prior art, the voltage step-up and step-down functions can be realized at the same time, and the voltage regulation range is very wide; and it has a voltage harmonic compensation function, which can improve the sinusoidality of the AC voltage; at the same time, the circuit topology is simple, the components are few, the cost is low, and the volume of the voltage regulator can be further reduced.

[0009] In a possible implementation, the first switch tube bridge arm includes a first switch tube and a second switch tube connected in series.

[0010] In a possible implementation manner, a diode is connected in reverse parallel between the source and the drain of the first switch tube, and a diode is connected in reverse parallel between the source and the drain of the second switch tube.

[0011] In a possible implementation manner, the second switch tube bridge arm includes a third switch tube and a fourth switch tube connected in series.

[0012] In a possible implementation manner, a diode is connected in reverse parallel between the source and the drain of the third switch tube, and a diode is connected in reverse parallel between the source and the drain of the fourth switch tube.

[0013] In a possible implementation, the circuit further includes: a third switch tube bridge arm, one end of the third switch tube bridge arm is connected to the fourth node, and the other end of the third switch tube bridge arm is connected to a connecting line between the first node and the second node.

[0014] In a possible implementation, the third switch tube bridge arm includes a fifth switch tube and a sixth switch tube connected in series, the drain of the fifth switch tube is connected to the connecting line between the first node and the second node, the source of the fifth switch tube is connected to the source of the sixth switch tube, and the drain of the sixth switch tube is connected to the fourth node.

[0015] In a possible implementation manner, a diode is connected in reverse parallel between the source and the drain of the fifth switch tube, and a diode is connected in reverse parallel between the source and the drain of the sixth switch tube.

[0016] In a possible implementation, the second voltage input terminal is connected to a neutral line of the alternating current.

[0017] In a second aspect, an embodiment of the present invention further provides a voltage regulator, comprising the voltage regulating circuit provided in the first aspect of the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, in which:

[0019] Figure 1 A schematic diagram of the structure of an energy absorption circuit provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a topological structure of an energy absorption circuit provided by an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the principle of an energy absorption circuit provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of another energy absorption circuit provided by an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of another energy absorption circuit provided by an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of the principle of another energy absorption circuit provided by an embodiment of the present invention;

[0025] Figure 7 A schematic diagram of the principle of another energy absorption circuit provided by an embodiment of the present invention;

[0026] Figure 8 A schematic diagram of the principle of another energy absorption circuit provided by an embodiment of the present invention;

[0027] Fig. 9 A schematic diagram of the principle of another energy absorption circuit provided by an embodiment of the present invention;

[0028] Fig.10 A schematic diagram of the principle of another energy absorption circuit provided by an embodiment of the present invention;

[0029] Fig.11 A schematic diagram of the structure of another energy absorption circuit provided by an embodiment of the present invention;

[0030] Fig.12 A schematic diagram of the topological structure of another energy absorption circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] In view of the common problems of large size, high cost, and complex circuit of AC voltage regulators in the prior art, an embodiment of the present invention provides a voltage regulation circuit for simultaneously realizing the functions of boosting and bucking, simplifying the circuit structure, reducing the cost, and reducing the size of the voltage regulator.

[0033] The circuit provided by the embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0034] Embodiment 1

[0035] like Figure 1 As shown, an embodiment of the present invention provides a voltage regulating circuit, comprising: a first voltage input terminal Lin1, a second voltage input terminal Lin2, a first voltage output terminal Lout1, a second voltage output terminal Lout2, and a first switch tube bridge arm, a capacitor branch and a second switch tube bridge arm connected in parallel, the capacitor branch comprises a first capacitor C1 and a second capacitor C2 connected in series, the second voltage input terminal Lin2 is connected to the second voltage output terminal Lout2, a third capacitor C3 and a fourth capacitor C4 are connected in series between the second voltage input terminal Lin2 and the first voltage output terminal Lout1, the first voltage input terminal Lin1 is respectively connected to a first node A1 and a second node A2, a first inductor L1 is connected between a connection point between the second voltage input terminal Lin2 and the third capacitor C3 and the third node A3, and a second inductor L2 is connected between a connection point between the first voltage output terminal Lin1 and the fourth capacitor C4 and the fourth node A4;

[0036] Among them, the first node A1 is the middle node of the first capacitor C1 and the second capacitor C2, the second node A2 is the middle node of the third capacitor C3 and the fourth capacitor C4, the third node A3 is the middle node of the two switch tubes connected in series in the first switch tube bridge arm, and the fourth node A4 is the middle node of the two switch tubes connected in series in the second switch tube bridge arm.

[0037] In a possible implementation, the first switch tube bridge arm includes a first switch tube Q1 and a second switch tube Q2 connected in series.

[0038] In a possible implementation manner, a diode is connected in reverse parallel between the source and the drain of the first switch tube Q1 , and a diode is connected in reverse parallel between the source and the drain of the second switch tube Q2 .

[0039] In a possible implementation manner, the second switch tube bridge arm includes a third switch tube Q3 and a fourth switch tube Q4 connected in series.

[0040] In a possible implementation manner, a diode is connected in reverse parallel between the source and the drain of the third switch tube Q3 , and a diode is connected in reverse parallel between the source and the drain of the fourth switch tube Q4 .

[0041] In a possible implementation manner, the second voltage input terminal Lin2 is connected to a neutral line of the alternating current.

[0042] In specific implementation, the voltage regulation circuit provided by the embodiment of the present invention can be divided into the following two parts according to function: one part is a PFC (Power Factor Correction) circuit, which is used to store energy for the first capacitor C1 and the second capacitor C2, and is composed of 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; and one part is an INV (Inverter) part, which is used to make the fourth capacitor C4 output various waveforms as required, and is composed of a third switch tube Q3, a fourth switch tube Q4, a second inductor L2, a first capacitor C1, a second capacitor C2 and a fourth capacitor C4. Among them, the first capacitor C1 and the second capacitor C2 are bus capacitors, C1 is a positive bus energy storage capacitor, and C2 is a negative bus energy storage capacitor. The PFC circuit and the INV circuit share these two capacitors.

[0043] The novelty of the voltage regulating circuit provided in the embodiment of the present invention is that the first voltage input terminal Lin1 is connected to the midpoint of the bus capacitors C1 and C2, and the second voltage input terminal is connected to the neutral line of the AC power. Then, the first voltage output of the voltage regulating circuit is equal to the voltage of the third capacitor C3 plus the voltage of the fourth capacitor C4. The equivalent circuit diagram is as follows: Figure 2 The voltage of the fourth capacitor C4 is controlled by the INV circuit part, and can output any waveform, and can be a positive voltage or a negative voltage, so that the voltage regulation circuit completes the AC voltage compensation, outputs a stable voltage with appropriate sinusoidality, and can also realize the voltage regulation function of step-up and step-down.

[0044] The working process of the voltage regulating circuit provided by the embodiment of the present invention is described below with reference to the accompanying drawings.

[0045] Implementation Method 1

[0046] When the input signal of the first voltage input terminal Lin1 is a sinusoidal positive voltage, the PFC circuit stores energy in the first inductor L1 when the first switch tube Q1 is turned on; when Q1 is turned off, energy is stored in the second capacitor C2 through the diode of the second switch tube Q2.

[0047] like Figure 3 As shown, when the first switch tube Q1 is turned on, the input signal passes through the first capacitor C1, the first switch tube Q1, the first inductor L1, and the third capacitor C3 from the first voltage input terminal Lin1 in sequence, and finally returns to the first voltage input terminal, wherein the first inductor L1 and the third capacitor C3 are also connected to the second voltage input terminal, and the second voltage input terminal is connected to the neutral line.

[0048] like Figure 4 As shown, when the first switch tube Q1 is cut off, the input signal passes through the second capacitor C2, the parallel diode of the second switch tube Q2, the first inductor L1, and the third capacitor C3 from the first voltage input terminal Lin1 in sequence, and finally returns to the first voltage input terminal, wherein the first inductor L1 and the third capacitor C3 are also connected to the second voltage input terminal, and the second voltage input terminal is connected to the neutral line.

[0049] Implementation Method 2

[0050] When the input signal of the first voltage input terminal Lin1 is a sinusoidal negative voltage, the PFC circuit stores energy in the first inductor L1 when the first switch tube Q2 is turned on; when Q2 is turned off, energy is stored in the first capacitor C1 through the diode of the first switch tube Q1.

[0051] like Figure 5 As shown, when the second switch tube Q2 is turned on, the input signal passes through the third capacitor C3, the first inductor L1, the second switch tube Q2, and the second capacitor C2 from the first voltage input terminal Lin1 in sequence, and finally returns to the first voltage input terminal, wherein the first inductor L1 and the third capacitor C3 are also connected to the second voltage input terminal, and the second voltage input terminal is connected to the neutral line.

[0052] like Figure 6 As shown, when the first switch tube Q2 is cut off, the input signal passes through the third capacitor C3, the first inductor L1, the parallel diode of the first switch tube Q1, and the first capacitor C1 from the first voltage input terminal Lin1 in sequence, and finally returns to the first voltage input terminal, wherein the first inductor L1 and the third capacitor C3 are also connected to the second voltage input terminal, and the second voltage input terminal is connected to the neutral line.

[0053] Implementation Method 3

[0054] In specific implementation, the INV circuit part can make the fourth capacitor C4 output a positive voltage or a negative voltage of any waveform according to circuit requirements, thereby compensating the voltage signal of the first voltage input terminal and completing the voltage boost or voltage drop function. The following takes a sine wave as an example to illustrate the working process of the INV circuit part outputting a positive voltage.

[0055] like Figure 7 As shown, when the third switch tube Q3 is turned on, the input signal passes through the third switch tube Q3, the second inductor L2, the fourth capacitor C4, the second node A2, the first node A1 from the positive electrode of the first capacitor C1 in sequence, and finally returns to the negative electrode of the first capacitor C1, completing the energy storage process of the second inductor L2.

[0056] like Figure 8 As shown, when the third switch tube Q3 is cut off, the input signal passes through the fourth capacitor C4, the second node A2, the first node A1, the second capacitor C2, and the parallel diode of the fourth switch tube Q4 from the second inductor L2 in sequence, and finally returns to the second inductor L2, completing the freewheeling process of the second inductor L2.

[0057] It should be noted that when the INV circuit partially outputs a positive voltage, if the input signal of the first voltage input terminal Lin1 is a positive voltage at this time, the output signal of the first voltage output terminal exhibits a boost; if the input signal of the first voltage input terminal Lin1 is a negative voltage at this time, the output signal of the first voltage output terminal Lout1 exhibits a step-down.

[0058] Implementation Method 4

[0059] In specific implementation, the INV circuit part can make the fourth capacitor C4 output a positive voltage or a negative voltage of any waveform according to circuit requirements, thereby compensating the voltage signal of the first voltage input terminal and completing the voltage boost or voltage drop function. The following takes a sine wave as an example to illustrate the working process of the INV circuit part outputting a negative voltage.

[0060] like Fig. 9 As shown, when the fourth switch tube Q4 is turned on, the input signal passes through the first node A1, the second node A2, the fourth capacitor C4, the second inductor L2, the fourth switch tube Q4 from the positive electrode of the second capacitor C2 in sequence, and finally returns to the negative electrode of the second capacitor C2, completing the energy storage process of the second inductor L2.

[0061] like Fig.10 As shown, when the fourth switch tube Q4 is cut off, the input signal passes through the parallel diode of the third switch tube Q3, the first capacitor C1, the first node A1, the second node A2, the fourth capacitor C4 from the second inductor L2 in sequence, and finally returns to the second inductor L2, completing the freewheeling process of the second inductor L2.

[0062] It should be noted that when the INV circuit partially outputs a negative voltage, if the input signal of the first voltage input terminal Lin1 is a positive voltage at this time, the output signal of the first voltage output terminal exhibits a step-down; if the input signal of the first voltage input terminal Lin1 is a negative voltage at this time, the output signal of the first voltage output terminal Lout1 exhibits a step-up.

[0063] Embodiment 2

[0064] like Fig.11 As shown, an embodiment of the present invention provides a voltage regulating circuit, comprising: a first voltage input terminal Lin1, a second voltage input terminal Lin2, a first voltage output terminal Lout1, a second voltage output terminal Lout2, and a first switch tube bridge arm, a capacitor branch and a second switch tube bridge arm connected in parallel, the capacitor branch comprises a first capacitor C1 and a second capacitor C2 connected in series, the second voltage input terminal Lin2 is connected to the second voltage output terminal Lout2, a third capacitor C3 and a fourth capacitor C4 are connected in series between the second voltage input terminal Lin2 and the first voltage output terminal Lout1, the first voltage input terminal Lin1 is respectively connected to a first node A1 and a second node A2, a first inductor L1 is connected between a connection point between the second voltage input terminal Lin2 and the third capacitor C3 and the third node A3, and a second inductor L2 is connected between a connection point between the first voltage output terminal Lin1 and the fourth capacitor C4 and the fourth node A4;

[0065] Among them, the first node A1 is the middle node of the first capacitor C1 and the second capacitor C2, the second node A2 is the middle node of the third capacitor C3 and the fourth capacitor C4, the third node A3 is the middle node of the two switch tubes connected in series in the first switch tube bridge arm, and the fourth node A4 is the middle node of the two switch tubes connected in series in the second switch tube bridge arm.

[0066] In a possible implementation, the first switch tube bridge arm includes a first switch tube Q1 and a second switch tube Q2 connected in series.

[0067] In a possible implementation manner, a diode is connected in reverse parallel between the source and the drain of the first switch tube Q1 , and a diode is connected in reverse parallel between the source and the drain of the second switch tube Q2 .

[0068] In a possible implementation manner, the second switch tube bridge arm includes a third switch tube Q3 and a fourth switch tube Q4 connected in series.

[0069] In a possible implementation manner, a diode is connected in reverse parallel between the source and the drain of the third switch tube Q3 , and a diode is connected in reverse parallel between the source and the drain of the fourth switch tube Q4 .

[0070] In a possible implementation, the circuit further includes: a third switch tube bridge arm, one end of the third switch tube bridge arm is connected to the fourth node A4, and the other end of the third switch tube bridge arm is connected to a connecting line between the first node A1 and the second node A2.

[0071] In a possible implementation, the third switch tube bridge arm includes a fifth switch tube Q5 and a sixth switch tube Q6 connected in series, the drain of the fifth switch tube Q5 is connected to the connecting line between the first node A1 and the second node A2, the source of the fifth switch tube Q5 is connected to the source of the sixth switch tube Q6, and the drain of the sixth switch tube Q6 is connected to the fourth node A4.

[0072] In a possible implementation manner, a diode is connected in reverse parallel between the source and the drain of the fifth switch tube Q5 , and a diode is connected in reverse parallel between the source and the drain of the sixth switch tube Q6 .

[0073] In a possible implementation manner, the second voltage input terminal Lin2 is connected to a neutral line of the alternating current.

[0074] Embodiment 3

[0075] In a possible implementation manner, the INV circuit part in the voltage regulation circuit provided in the embodiment of the present invention may also be as follows: Fig.12 As shown, it is connected in parallel across the fourth capacitor C4.

[0076] Based on the same concept as the above-mentioned embodiment of the present invention, the embodiment of the present invention further provides a voltage regulator, including the voltage regulating circuit provided by the embodiment of the present invention.

[0077] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0078] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0079] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0080] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0081] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A voltage regulating circuit, It is characterized in that include: A first voltage input terminal, a second voltage input terminal, a first voltage output terminal, a second voltage output terminal, and a first switch tube bridge arm, a capacitor branch, and a second switch tube bridge arm connected in parallel, wherein the capacitor branch includes a first capacitor and a second capacitor connected in series, the second voltage input terminal is connected to the second voltage output terminal, a third capacitor and a fourth capacitor are connected in series between the second voltage input terminal and the first voltage output terminal, the first voltage input terminal is connected to a first node and a second node respectively, a first inductor is connected between a connection point between the second voltage input terminal and the third capacitor and the third node, and a second inductor is connected between a connection point between the first voltage output terminal and the fourth capacitor and the fourth node; The first node is the middle node between the first capacitor and the second capacitor, the second node is the middle node between the third capacitor and the fourth capacitor, the third node is the middle node between two switch tubes connected in series in the first switch tube bridge arm, and the fourth node is the middle node between two switch tubes connected in series in the second switch tube bridge arm; The second voltage input terminal is connected to the neutral line of the alternating current; The voltage regulation circuit includes a PFC circuit and an INV circuit, the PFC circuit includes the first switch tube bridge arm, the first capacitor, the second capacitor, the third capacitor and the first inductor, and the INV circuit includes the second switch tube bridge arm, the first capacitor, the second capacitor, the fourth capacitor and the second inductor, wherein the PFC circuit and the INV circuit share the first capacitor and the second capacitor; The INV circuit enables the fourth capacitor to output a positive voltage or a negative voltage of an arbitrary waveform according to circuit requirements, compensates for the voltage signal of the first voltage input terminal, and completes a voltage boost or voltage drop function.

2. The circuit according to claim 1, It is characterized in that The first switch tube bridge arm includes a first switch tube and a second switch tube connected in series.

3. The circuit according to claim 2, It is characterized in that A diode is connected in reverse parallel between the source and drain of the first switch tube, and a diode is connected in reverse parallel between the source and drain of the second switch tube.

4. The circuit according to claim 1, It is characterized in that The second switch tube bridge arm includes a third switch tube and a fourth switch tube connected in series.

5. The circuit according to claim 4, It is characterized in that A diode is connected in reverse parallel between the source and drain of the third switch tube, and a diode is connected in reverse parallel between the source and drain of the fourth switch tube.

6. The circuit according to claim 1, It is characterized in that The circuit further includes: a third switch tube bridge arm, one end of the third switch tube bridge arm is connected to the fourth node, and the other end of the third switch tube bridge arm is connected to a connecting line between the first node and the second node.

7. The circuit according to claim 6, It is characterized in that The third switch tube bridge arm includes a fifth switch tube and a sixth switch tube connected in series, the drain of the fifth switch tube is connected to the connecting line between the first node and the second node, the source of the fifth switch tube is connected to the source of the sixth switch tube, and the drain of the sixth switch tube is connected to the fourth node.

8. The circuit according to claim 7, It is characterized in that A diode is connected in reverse parallel between the source and drain of the fifth switch tube, and a diode is connected in reverse parallel between the source and drain of the sixth switch tube.

9. A voltage regulator, It is characterized in that The voltage regulator comprises a voltage regulating circuit as claimed in any one of claims 1 to 8.

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