Voltage regulating circuit, control method thereof and driving equipment

Abstract

The invention discloses a voltage regulating circuit, a control method thereof and driving equipment, and relates to the technical field of high-low voltage conversion. The voltage regulating circuit comprises a transformer, a first switch, a second switch, a third switch and a fourth switch, the first switch and the second switch form a first half-bridge and are arranged on the primary side of the transformer; the third switch and the fourth switch form a second half-bridge and are arranged on the secondary side of the transformer; the method comprises the steps that a first preset switch adjusting signal controls a first switch to be turned on or turned off, a second preset switch adjusting signal controls a second switch to be turned on or turned off, a third preset switch adjusting signal controls a third switch to be turned on or turned off, and a fourth preset switch adjusting signal controls a fourth switch to be turned on or turned off; the third preset switch adjusting signal lags behind the first preset switch adjusting signal by a first preset angle, and the fourth preset switch adjusting signal lags behind the second preset switch adjusting signal by a second preset angle. According to the invention, voltage regulation in a wide range is realized, and the voltage conversion efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of high-low voltage conversion technology, specifically to a voltage regulating circuit and its control method and driving equipment. Background Technology

[0002] Compared to traditional gasoline vehicles, electric vehicles require a new path to charge the onboard low-voltage battery (e.g., 12V) through a high-voltage battery pack (e.g., 300-1000V) to prevent it from running out of power. This necessitates the use of high-to-low voltage DC-DC converter circuits. Traditional solutions primarily employ single-stage and two-stage approaches. Single-stage solutions often utilize phase-shifted full-bridge and LLC converters. While these require fewer components and are simpler to control than two-stage solutions, they struggle to meet the requirements for wide voltage regulation ratios and high efficiency. Two-stage solutions, building upon single-stage solutions, add a voltage pre-control stage, reducing the voltage regulation range of the second stage and improving system efficiency. However, compared to single-stage solutions, this approach uses more components and adds an extra control stage, increasing software complexity. Summary of the Invention

[0003] Purpose of the invention: The embodiments of this application provide a control method for a voltage regulating circuit, which aims to overcome the technical problems of existing devices having complex structures or being unable to meet the requirements of wide-range voltage regulation ratio and high efficiency; another purpose of the embodiments of this application is to provide a voltage regulating circuit; a third purpose of this application is to provide a driving device.

[0004] Technical solution: The present application describes a control method for a voltage regulating circuit. The control method is executed by the voltage regulating circuit, which includes at least a transformer, a first switch, a second switch, a third switch, and a fourth switch. The first switch and the second switch form a first half-bridge and are disposed on the primary side of the transformer, and the third switch and the fourth switch form a second half-bridge and are disposed on the secondary side of the transformer.

[0005] The method includes: controlling the first switch to be turned on or off with a first preset switch adjustment signal, controlling the second switch to be turned on or off with a second preset switch adjustment signal, controlling the third switch to be turned on or off with a third preset switch adjustment signal, and controlling the fourth switch to be turned on or off with a fourth preset switch adjustment signal.

[0006] Wherein, the third preset switch adjustment signal lags behind the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags behind the second preset switch adjustment signal by a second preset angle.

[0007] Accordingly, the voltage regulating circuit described in this application embodiment includes at least: a transformer, a first switch, a second switch, a third switch, and a fourth switch; wherein the first switch and the second switch form a first half-bridge and are disposed on the primary side of the transformer, and the third switch and the fourth switch form a second half-bridge and are disposed on the secondary side of the transformer;

[0008] The first switch is turned on or off by a first preset switch adjustment signal, the second switch is turned on or off by a second preset switch adjustment signal, the third switch is turned on or off by a third preset switch adjustment signal, and the fourth switch is turned on or off by a fourth preset switch adjustment signal.

[0009] Wherein, the third preset switch adjustment signal lags behind the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags behind the second preset switch adjustment signal by a second preset angle.

[0010] Accordingly, the driving device described in the embodiments of this application includes the voltage regulating circuit as described above.

[0011] Beneficial Effects: Compared with the prior art, the voltage regulating circuit and its control method and driving device of the present application embodiment, wherein the control method of the voltage regulating circuit is executed by the voltage regulating circuit, the voltage regulating circuit includes at least: a transformer, a first switch, a second switch, a third switch and a fourth switch; wherein, the first switch and the second switch form a first half-bridge and are disposed on the primary side of the transformer, and the third switch and the fourth switch form a second half-bridge and are disposed on the secondary side of the transformer; the method includes: controlling the first switch to be turned on or off with a first preset switch adjustment signal, controlling the second switch to be turned on or off with a second preset switch adjustment signal, controlling the third switch to be turned on or off with a third preset switch adjustment signal, and controlling the fourth switch to be turned on or off with a fourth preset switch adjustment signal; wherein, the third preset switch adjustment signal lags the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags the second preset switch adjustment signal by a second preset angle. Therefore, by configuring a transformer, a first switch, a second switch, a third switch, and a fourth switch, the third and fourth switches on the secondary side of the transformer are used for full-wave rectification and also reused as switching transistors. These switches, in conjunction with the first and second switches on the primary side of the transformer, lag the switching adjustment signals of the third and fourth switches by a certain angle, thereby regulating the input and output voltage range, achieving wider voltage regulation, and improving voltage conversion efficiency. Furthermore, by using the third and fourth switches on the secondary side of the transformer for full-wave rectification and also reusing them as switching transistors, compared to existing technologies, the number of components used can be reduced, the circuit structure simplified, costs lowered, and efficiency improved. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of a voltage regulation circuit provided in an embodiment of this application;

[0014] Figure 2 This is a flowchart of a control method for a voltage regulation circuit provided in the embodiments of this application;

[0015] Figure 3 This is a timing diagram of a switch control signal provided in an embodiment of this application;

[0016] Figure 4 This is a schematic diagram of the discrete AC / DC equivalent circuit structure of a voltage regulating circuit provided in the embodiments of this application;

[0017] Figure 5 This is a schematic diagram of the fundamental equivalent circuit structure of a voltage regulation circuit provided in the embodiments of this application;

[0018] Figure 6 This is a schematic diagram of a simulation calculation gain comparison curve provided in the embodiments of this application.

[0019] Figure label:

[0020] Tx - Transformer; Q1 - First switch; Q2 - Second switch; Q3 - Third switch; Q4 - Fourth switch; T1 - First secondary side of transformer; T2 - Second secondary side of transformer; T0 - Primary side of transformer; Lr - Resonant inductor; Cout - Output capacitor; Rload - Load; C1 - First capacitor; C2 - Second capacitor. Detailed Implementation

[0021] The technical solutions of the embodiments of this application 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 this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] It should be understood that although the terms first, second, etc., may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component discussed below may be referred to as the second component without departing from the teachings of this application. As used herein, the term "and / or" includes all combinations of any and more of the associated listed items.

[0023] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes shown in the drawings are not necessarily essential for implementing this application and therefore should not be used to limit the scope of protection of this application.

[0024] Figure 1 This is a schematic diagram of a voltage regulation circuit provided in an embodiment of this application. Please refer to... Figure 1 The voltage regulating circuit includes a transformer Tx, a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4. The first switch Q1 and the second switch Q2 form a first half-bridge and are located on the primary side T0 of the transformer. The third switch Q3 and the fourth switch Q4 form a second half-bridge and are located on the secondary side of the transformer. The secondary side of the transformer includes a first secondary side T1 and a second secondary side T2. (Continue reading...) Figure 1 The voltage regulation circuit also includes: a first capacitor C1, a second capacitor C2, a resonant inductor Lr, an output capacitor Cout, and a load Rload. The first capacitor C1 and the second capacitor C2 form a passive bridge arm, the first switch Q1 and the second switch Q2 form an active bridge arm, and the third switch Q3 and the fourth switch form a full-wave rectifier circuit on the secondary side. The resonant inductor Lr, along with the first capacitor C1 and the second capacitor C2, forms a resonant cavity, which has the advantages of low turn-off current and high conversion efficiency.

[0025] The first capacitor C1 and the second capacitor C2 in the passive half-bridge have two functions: first, they block DC current to prevent transformer magnetization; second, they provide resonance to reduce the turn-off current of the primary-side switch and improve system efficiency.

[0026] Among them, the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 can be switching transistors, such as MOSFET transistors, etc. The specific settings can be made according to the actual situation, and no specific restrictions are made here.

[0027] In the electric vehicle field, existing high-to-low voltage conversion methods for achieving high efficiency and wide voltage regulation range mainly employ single-stage and two-stage solutions. Single-stage solutions often utilize phase-shifted full-bridge and LLC circuits. While these methods use fewer components and are simpler to control compared to two-stage solutions, they struggle to meet the requirements for wide voltage regulation ratios and high efficiency. Two-stage solutions, building upon single-stage solutions, add a voltage pre-control stage to reduce the voltage regulation range of the second stage and improve system efficiency. However, compared to single-stage solutions, this approach uses more components and adds an extra control stage, increasing software complexity. Therefore, this application provides a control method for a voltage regulation circuit to achieve a wider voltage regulation range and improve voltage conversion efficiency.

[0028] Figure 2 This is a flowchart illustrating a control method for a voltage regulation circuit provided in an embodiment of this application. Please refer to [link / reference]. Figure 2 The method includes the following steps:

[0029] Step 110: Control the first switch to be turned on or off using the first preset switch adjustment signal, control the second switch to be turned on or off using the second preset switch adjustment signal, control the third switch to be turned on or off using the third preset switch adjustment signal, and control the fourth switch to be turned on or off using the fourth preset switch adjustment signal.

[0030] Among them, the third preset switch adjustment signal lags behind the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags behind the second preset switch adjustment signal by a second preset angle.

[0031] In this circuit, the third and fourth switches are used for full-wave rectification on the secondary side and also multiplexed to coordinate with the first and second switches on the primary side. The switching adjustment signals of the third and fourth switches lag behind those of the first and second switches by a certain angle, thereby adjusting the gain of the voltage regulation circuit and thus the voltage regulation range. This allows for a wider range of voltage regulation and improved voltage conversion efficiency. Furthermore, by multiplexing the third and fourth switches on the secondary side, a wider voltage range adjustment and full-wave rectification can be achieved while further simplifying the circuit structure, reducing the number of components, lowering design costs, and improving efficiency.

[0032] The first preset angle is proportional to the output gain of the voltage regulation circuit, and the second preset angle is also proportional to the output gain of the voltage regulation circuit. Therefore, by adjusting the angle by which the switching adjustment signal of the third switch lags behind the switching adjustment signal of the first switch, and the angle by which the switching signal of the fourth switch lags behind the switching adjustment signal of the second switch, the output gain of the circuit can be adjusted, thereby adjusting the input / output range of the voltage and achieving a wider range of voltage regulation.

[0033] The first preset angle and the second preset angle can be the same or different. The specific settings can be made according to the actual situation, and no specific restrictions are made here.

[0034] In the technical solution of this embodiment, the working principle of the control method of the voltage regulation circuit is as follows: (See reference) Figure 2 The system uses a first preset switch adjustment signal to control the first switch to turn on or off, a second preset switch adjustment signal to control the second switch to turn on or off, a third preset switch adjustment signal to control the third switch to turn on or off, and a fourth preset switch adjustment signal to control the fourth switch to turn on or off. Furthermore, the third preset switch adjustment signal lags behind the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags behind the second preset switch adjustment signal by a second preset angle. Thus, by setting up a transformer, a first switch, a second switch, a third switch, and a fourth switch, the third and fourth switches on the secondary side of the transformer are used for full-wave rectification and also reused as switching transistors. In conjunction with the first and second switches on the primary side of the transformer, the switching adjustment signals of the third and fourth switches lag behind the switching adjustment signals of the first and second switches by a certain angle, thereby adjusting the input and output voltage range, achieving a wider range of voltage regulation, and improving voltage conversion efficiency. In addition, using the third and fourth switches on the secondary side of the transformer for full-wave rectification and also reused as switching transistors reduces the number of components used, simplifies the circuit structure, reduces costs, and improves efficiency compared to existing technologies.

[0035] Optionally, based on the above embodiments, the first preset angle and the second preset angle are equal.

[0036] For example, in this embodiment of the application, the angle by which the switching adjustment signal of the third switch lags behind the switching adjustment signal of the first switch is the same as the angle by which the switching signal of the fourth switch lags behind the switching adjustment signal of the second switch (the same applies below, and will not be repeated).

[0037] The specific values ​​of the first preset angle and the second preset angle can be set according to the actual situation, and no specific limitation is made here.

[0038] Based on the above embodiments, optionally, the first preset switch adjustment signal is complementary to the second preset switch adjustment signal, and the third preset switch adjustment signal is complementary to the fourth preset switch adjustment signal.

[0039] The first preset switch adjustment signal and the second preset switch adjustment signal are complementary. Within the same switch adjustment cycle, the on-time of the first switch and the off-time of the second switch are the same, and similarly, the off-time of the first switch and the on-time of the second switch are the same. In other words, when the first switch is on, the second switch is off, and when the first switch is off, the second switch is on.

[0040] The third preset switch adjustment signal and the fourth preset switch adjustment signal are complementary. Within the same switch adjustment cycle, the on-time of the third switch and the off-time of the fourth switch are the same, and similarly, the off-time of the third switch and the on-time of the fourth switch are the same. In other words, when the third switch is on, the fourth switch is off, and when the third switch is off, the fourth switch is on.

[0041] Specifically, a first preset switch adjustment signal controls the first switch to be turned on or off, a second preset switch adjustment signal controls the second switch to be turned on or off, a third preset switch adjustment signal controls the third switch to be turned on or off, and a fourth preset switch adjustment signal controls the fourth switch to be turned on or off. The first and second preset switch adjustment signals are complementary, as are the third and fourth preset switch adjustment signals. Furthermore, the third preset switch adjustment signal lags behind the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags behind the second preset switch adjustment signal by a second preset angle. Therefore, by adjusting the angle by which the third switch adjustment signal lags behind the first switch adjustment signal, and the angle by which the fourth switch adjustment signal lags behind the second switch adjustment signal, the output gain of the circuit can be adjusted, thereby adjusting the input / output voltage range. This achieves a wider range of voltage regulation and improves conversion efficiency. Moreover, by multiplexing the third and fourth switches on the secondary side, while achieving wide-range voltage regulation and full-wave rectification, the circuit structure can be further simplified, the number of components used can be reduced, design costs can be lowered, and efficiency can be improved.

[0042] Based on the above embodiments, optionally, the first preset switch adjustment signal is a first preset duty cycle signal, the second preset switch adjustment signal is a second preset duty cycle signal, the third preset switch adjustment signal is a third preset duty cycle signal, and the fourth preset switch adjustment signal is a fourth preset duty cycle signal.

[0043] The switching adjustment signals for the first, second, third, and fourth switches can be duty cycle signals, frequency modulation signals, etc., and can be set according to the actual situation. No specific limitations are made here.

[0044] For example, in this embodiment, taking the switch adjustment signal as a duty cycle signal as an example, the first preset switch adjustment signal of the first switch is the first preset duty cycle signal, the second preset switch adjustment signal of the second switch is the second preset duty cycle signal, the third preset switch adjustment signal of the third switch is the third preset duty cycle signal, and the fourth preset switch adjustment signal of the fourth switch is the fourth preset duty cycle signal. The first preset duty cycle signal of the first switch is complementary to the second preset duty cycle signal of the second switch, and the third preset duty cycle signal of the third switch is complementary to the fourth preset duty cycle signal of the fourth switch. Furthermore, the third preset duty cycle signal of the third switch lags behind the first preset duty cycle signal of the first switch by a first preset angle, and the fourth preset duty cycle signal of the fourth switch lags behind the second preset duty cycle signal of the second switch by a second preset angle. Therefore, by adjusting the angle by which the duty cycle signal of the third switch lags behind the duty cycle signal of the first switch, and the angle by which the duty cycle signal of the fourth switch lags behind the duty cycle signal of the second switch, the output gain of the circuit can be adjusted, thereby regulating the input / output voltage range and achieving wider voltage regulation, thus improving conversion efficiency. Furthermore, by multiplexing the third and fourth switches on the secondary side, while achieving wide-range voltage regulation and full-wave rectification, the circuit structure can be further simplified, the number of components used can be reduced, design costs can be lowered, and efficiency can be improved.

[0045] Based on the above embodiments, optionally, the first preset duty cycle signal and the second preset duty cycle signal are complementary and are turned on with a 50% duty cycle, and the third preset duty cycle signal and the fourth preset duty cycle signal are complementary and are turned on with a 50% duty cycle.

[0046] Figure 3 This is a timing diagram of a switch control signal provided in an embodiment of this application. For the first preset duty cycle signal of the first switch, please refer to [link / reference needed]. Figure 3 Please refer to curve L1 in the figure, and the second preset duty cycle signal of the second switch. Figure 3 Please refer to curve L2 in the figure, and the third preset duty cycle signal of the third switch. Figure 3 Please refer to curve L3 in the image, and the fourth preset duty cycle signal of the fourth switch. Figure 3Curve L4 in the diagram illustrates this. For example, taking one switching cycle T as an example, according to curves L1 to L4, the first preset duty cycle signal of the first switch is complementary to the second preset duty cycle signal of the second switch, and both switches are turned on and off with a 50% duty cycle. Similarly, the third preset duty cycle signal of the third switch is complementary to the fourth preset duty cycle signal of the fourth switch, and both switches are turned on and off with a 50% duty cycle. Furthermore, the third preset duty cycle signal of the third switch lags behind the first preset duty cycle signal of the first switch by an angle α, and the fourth preset duty cycle signal of the fourth switch lags behind the second preset duty cycle signal of the second switch by an angle α. Therefore, by adjusting the angle α, the output gain of the circuit can be adjusted, thereby adjusting the input / output voltage range, achieving a wider range of voltage regulation and improving conversion efficiency. Moreover, by multiplexing the third and fourth switches on the secondary side, while achieving wide-range voltage regulation and full-wave rectification, the circuit structure can be further simplified, the number of components used can be reduced, design costs can be lowered, and efficiency can be improved.

[0047] Figure 4 This is a schematic diagram of the discrete AC / DC equivalent circuit structure of a voltage regulating circuit provided in the embodiments of this application. Figure 5 This is a schematic diagram of the fundamental equivalent circuit structure of a voltage regulation circuit provided in an embodiment of this application. For example, for ease of analysis, [the following is an example / illustration]. Figure 1 The circuit in the diagram is equivalent to Figure 4 The discrete AC / DC equivalent circuit is shown. Figure 4 In the equivalent circuit, equivalent power supplies V2 and V3 are obtained, both with a voltage value of Vin / 2, where Vin is the input voltage of power supply V1. According to... Figure 4 The equivalent circuit can be obtained using the Fast Harmonic Analysis (FHA) method. Figure 5 The fundamental equivalent circuit is shown. Figure 5 In the equivalent circuit, the equivalent power supply Vin FHA can be obtained, with an output voltage N times the fundamental input voltage Vo FHA, where N is the turns ratio of the transformer's primary and secondary sides. Therefore, according to... Figure 5 The equivalent circuit can be used to obtain the expression for the output voltage:

[0048]

[0049] Where α is the angle by which the switching adjustment signal of the third switch lags behind the switching adjustment signal of the first switch, and the angle by which the switching adjustment signal of the fourth switch lags behind the switching adjustment signal of the second switch is also α.

[0050] Among them, V in R is the input voltage of power supply V1. load V is the load resistance. of is the circuit output voltage. sw L is the switching frequency. r C is a resonant inductor. r C1 is the resonant capacitor, and C2 is the sum of the capacitances of the first capacitor C1 and the second capacitor C2 connected in parallel. n is the turns ratio of the primary and secondary sides of the transformer.

[0051] Considering the output gain M of the circuit is:

[0052]

[0053] Then the circuit output voltage V o Substituting into the output gain formula, we get the gain expression as follows:

[0054]

[0055] From the gain expression, it can be deduced that the angle by which the switching adjustment signal of the third switch lags behind the switching adjustment signal of the first switch is proportional to the output gain of the circuit. Similarly, the angle by which the switching adjustment signal of the fourth switch lags behind the switching adjustment signal of the second switch is also proportional to the output gain of the circuit. Therefore, by adjusting the angle α, the output gain of the circuit can be adjusted, thereby adjusting the input / output voltage range, achieving a wider range of voltage regulation, and improving conversion efficiency.

[0056] Figure 6 This is a schematic diagram of a simulation calculation gain comparison curve provided in an embodiment of this application. (See also...) Figure 6 Curve S1 is the gain curve calculated based on the above gain expression, and curve S2 is the gain curve obtained through simulation. Comparing the gain obtained from simulation with the gain calculated using the above gain expression reveals that as the hysteresis angle increases, the proportion of harmonic components increases, leading to deviations in the gain expression derived by the FHA. In the gain range of 0-4, the gain calculated using the above gain expression fits the actual gain curve well; therefore, the gain range of 0-4 can be used to calculate circuit parameters.

[0057] Accordingly, this application also provides a voltage regulating circuit. The voltage regulating circuit includes a transformer, a first switch, a second switch, a third switch, and a fourth switch; wherein the first and second switches form a first half-bridge and are disposed on the primary side of the transformer, and the third and fourth switches form a second half-bridge and are disposed on the secondary side of the transformer; wherein the conduction or deactivation of the first switch is controlled by a first preset switch adjustment signal, the conduction or deactivation of the second switch is controlled by a second preset switch adjustment signal, the conduction or deactivation of the third switch is controlled by a third preset switch adjustment signal, and the conduction or deactivation of the fourth switch is controlled by a fourth preset switch adjustment signal; wherein the third preset switch adjustment signal lags behind the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags behind the second preset switch adjustment signal by a second preset angle.

[0058] The technical solution of this embodiment provides a voltage regulating circuit, which includes at least a transformer, a first switch, a second switch, a third switch, and a fourth switch. The first and second switches form a first half-bridge and are disposed on the primary side of the transformer, while the third and fourth switches form a second half-bridge and are disposed on the secondary side of the transformer. The first switch is turned on or off by a first preset switch adjustment signal, the second switch is turned on or off by a second preset switch adjustment signal, the third switch is turned on or off by a third preset switch adjustment signal, and the fourth switch is turned on or off by a fourth preset switch adjustment signal. The third preset switch adjustment signal lags behind the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags behind the second preset switch adjustment signal by a second preset angle. Therefore, this voltage regulation circuit can achieve the following: by setting up a transformer, a first switch, a second switch, a third switch, and a fourth switch, the third and fourth switches on the secondary side of the transformer are used for full-wave rectification and also multiplexed as switching transistors. These switches, in conjunction with the first and second switches on the primary side of the transformer, lag the switching adjustment signals of the third and fourth switches by a certain angle, thereby regulating the input and output voltage range, achieving a wider range of voltage regulation, and improving voltage conversion efficiency. Furthermore, by using the third and fourth switches on the secondary side of the transformer for full-wave rectification and also multiplexing them as switching transistors, compared with existing technologies, the number of components used can be reduced, the circuit structure simplified, costs lowered, and efficiency improved.

[0059] In some embodiments, the first preset angle is equal to the second preset angle.

[0060] In some embodiments, the first preset switch adjustment signal is complementary to the second preset switch adjustment signal, and the third preset switch adjustment signal is complementary to the fourth preset switch adjustment signal.

[0061] In some embodiments, the first preset switch adjustment signal is a first preset duty cycle signal, the second preset switch adjustment signal is a second preset duty cycle signal, the third preset switch adjustment signal is a third preset duty cycle signal, and the fourth preset switch adjustment signal is a fourth preset duty cycle signal.

[0062] In some embodiments, the first preset duty cycle signal and the second preset duty cycle signal are complementary and are turned on with a 50% duty cycle, and the third preset duty cycle signal and the fourth preset duty cycle signal are complementary and are turned on with a 50% duty cycle.

[0063] In some embodiments, the first switch, the second switch, the third switch, and the fourth switch are crystal switching transistors.

[0064] Accordingly, embodiments of this application also provide a driving device, which includes the voltage regulating circuit described in any embodiment of this application.

[0065] The driving device can be an electric driving device, such as an electric vehicle or an electric engineering driving device. Since the driving device includes the voltage regulation circuit provided in any embodiment of this application, when the driving device performs voltage conversion, for example, when charging the vehicle's low-voltage battery (12V) through a high-voltage battery pack (300-1000V) to prevent it from running out of power, a wider range of voltage regulation can be achieved, and voltage conversion efficiency can be improved. Furthermore, by using the third and fourth switches on the secondary side of the transformer for full-wave rectification while also multiplexing them as switching transistors, this circuit, compared with the prior art, can reduce the number of components used, simplify the circuit structure, reduce costs, and improve efficiency.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] The voltage regulation circuit, control method, and driving device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A control method for a voltage regulating circuit, characterized in that, The operation is performed by a voltage regulating circuit, which includes at least: a transformer, a first switch, a second switch, a third switch, and a fourth switch; wherein the first switch and the second switch form a first half-bridge and are disposed on the primary side of the transformer, and the third switch and the fourth switch form a second half-bridge and are disposed on the secondary side of the transformer; The method includes: controlling the first switch to be turned on or off with a first preset switch adjustment signal, controlling the second switch to be turned on or off with a second preset switch adjustment signal, controlling the third switch to be turned on or off with a third preset switch adjustment signal, and controlling the fourth switch to be turned on or off with a fourth preset switch adjustment signal. Wherein, the third preset switch adjustment signal lags behind the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags behind the second preset switch adjustment signal by a second preset angle.

2. The control method for the voltage regulating circuit according to claim 1, characterized in that, The first preset angle is equal to the second preset angle.

3. The control method for the voltage regulating circuit according to claim 1, characterized in that, The first preset switch adjustment signal is complementary to the second preset switch adjustment signal, and the third preset switch adjustment signal is complementary to the fourth preset switch adjustment signal.

4. The control method for the voltage regulating circuit according to claim 1, characterized in that, The first preset switch adjustment signal is a first preset duty cycle signal, the second preset switch adjustment signal is a second preset duty cycle signal, the third preset switch adjustment signal is a third preset duty cycle signal, and the fourth preset switch adjustment signal is a fourth preset duty cycle signal.

5. The control method for the voltage regulating circuit according to claim 4, characterized in that, The first preset duty cycle signal is complementary to the second preset duty cycle signal and is turned on with a 50% duty cycle. The third preset duty cycle signal is complementary to the fourth preset duty cycle signal and is turned on with a 50% duty cycle.

6. A voltage regulating circuit, characterized in that, At least including: A transformer, a first switch, a second switch, a third switch, and a fourth switch; wherein the first switch and the second switch form a first half-bridge and are disposed on the primary side of the transformer, and the third switch and the fourth switch form a second half-bridge and are disposed on the secondary side of the transformer; The first switch is turned on or off by a first preset switch adjustment signal, the second switch is turned on or off by a second preset switch adjustment signal, the third switch is turned on or off by a third preset switch adjustment signal, and the fourth switch is turned on or off by a fourth preset switch adjustment signal. Wherein, the third preset switch adjustment signal lags behind the first preset switch adjustment signal by a first preset angle, and the fourth preset switch adjustment signal lags behind the second preset switch adjustment signal by a second preset angle.

7. The voltage regulating circuit according to claim 6, characterized in that, The first preset angle is equal to the second preset angle.

8. The voltage regulating circuit according to claim 6, characterized in that, The first preset switch adjustment signal is complementary to the second preset switch adjustment signal, and the third preset switch adjustment signal is complementary to the fourth preset switch adjustment signal.

9. The voltage regulating circuit according to claim 6, characterized in that, The first preset switch adjustment signal is a first preset duty cycle signal, the second preset switch adjustment signal is a second preset duty cycle signal, the third preset switch adjustment signal is a third preset duty cycle signal, and the fourth preset switch adjustment signal is a fourth preset duty cycle signal.

10. The voltage regulating circuit according to claim 9, characterized in that, The first preset duty cycle signal is complementary to the second preset duty cycle signal and is turned on with a 50% duty cycle. The third preset duty cycle signal is complementary to the fourth preset duty cycle signal and is turned on with a 50% duty cycle.

11. The voltage regulating circuit according to claim 6, characterized in that, The first switch, the second switch, the third switch, and the fourth switch are crystal switching transistors.

12. A driving device, characterized in that, Includes the voltage regulating circuit as described in any one of claims 6-11.

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