Voltage conversion circuit, control method thereof and controller

Abstract

The invention discloses a voltage conversion circuit, a control method thereof and a controller. The voltage conversion circuit comprises a first switching network, a second switching network, a resonance configuration network and the controller. The first switching network is used for rectifying or generating a PFM waveform. The second switching network is used for rectifying or generating a PFM waveform. The resonance configuration network comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, and the first inductor and the second inductor are connected between the first switch unit and the second switch unit in series. The first capacitor and the second capacitor are connected in series between the third switch unit and the fourth switch unit, the first switch unit and the second switch unit are connected with the first switch network, the first switch unit is connected with the fourth switch unit and the third bridge arm unit, and the second switch unit is connected with the third switch unit and the fourth bridge arm unit. In this way, the method can be suitable for different application scenes and is high in practicability.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electronic circuit technology, and in particular to a voltage conversion circuit and a control method and a controller thereof. Background Art

[0002] In the application of micro power modules, battery charging and discharging are increasingly involved. Battery charging and discharging require the converter to work bidirectionally, and micro power modules usually do not require isolation. Conventional non-isolated topologies include buck topology, boost topology or buck-boost topology, among which the buck-boost topology can be designed to work bidirectionally. However, since the buck-boost topology is a hard-switching topology, the opening and closing of the power device is neither zero voltage switching nor zero current switching, the switching loss is large, and the efficiency is low. Based on this, a resonant converter with less switching loss and higher efficiency can be selected, such as an LLC resonant converter or an LCC resonant converter.

[0003] However, current resonant converters are only suitable for specific application scenarios and have significant limitations. Summary of the invention

[0004] The embodiments of the present application provide a voltage conversion circuit and a control method and a controller thereof, which can be applied to different application scenarios and have strong practicality.

[0005] In a first aspect, an embodiment of the present application provides a voltage conversion circuit, comprising:

[0006] A first switch network, comprising a first bridge arm unit and a second bridge arm unit connected in parallel, for rectifying or generating a PFM waveform;

[0007] A second switch network, comprising a third bridge arm unit and a fourth bridge arm unit connected in parallel, for rectifying or generating a PFM waveform;

[0008] A resonant configuration network, comprising a first inductor, a second inductor, a first capacitor, a second capacitor, a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, wherein the first inductor and the second inductor are connected in series between a first end of the first switch unit and a first end of the second switch unit, the first capacitor and the second capacitor are connected in series between a first end of the third switch unit and a first end of the fourth switch unit, a first node is connected to a second node, a first end of the first switch unit is connected to the second bridge arm unit, a second end of the first switch unit is respectively connected to a second end of the fourth switch unit and the fourth bridge arm unit, a second end of the second switch unit is respectively connected to a second end of the third switch unit and the third bridge arm unit, and a first end of the fourth switch unit is connected to the first bridge arm unit, wherein the first node is a connection point between the first inductor and the second inductor, and the second node is a connection point between the first capacitor and the second capacitor;

[0009] Wherein, at least one of the first switch unit and the fourth switch unit is configured to be turned on, and at least one of the second switch unit and the third switch unit is configured to be turned on;

[0010] The controller is connected to the first switch network, the second switch network and the switch tubes in the resonant configuration network respectively, and the controller is used to control the conduction or shutdown of the switch tubes in the first switch network, the second switch network and the resonant configuration network.

[0011] In one or more embodiments, the first bridge arm unit includes a first switch tube and a second switch tube, and the second bridge arm unit includes a third switch tube and a fourth switch tube;

[0012] The second end of the first switch tube is connected to the third end of the second switch tube and the first end of the first capacitor respectively, the second end of the third switch tube is connected to the third end of the fourth switch tube and the first end of the first inductor respectively, the third end of the first switch tube is connected to the third end of the third switch tube, and the second end of the second switch tube is connected to the second end of the fourth switch tube;

[0013] The first end of the first switch tube, the first end of the second switch tube, the first end of the third switch tube, and the first end of the fourth switch tube are all connected to the controller.

[0014] In one or more embodiments, the third bridge arm unit includes a fifth switch tube and a sixth switch tube, and the fourth bridge arm unit includes a seventh switch tube and an eighth switch tube;

[0015] The second end of the fifth switch tube is connected to the third end of the sixth switch tube and the second end of the second switch unit respectively, the second end of the seventh switch tube is connected to the third end of the eighth switch tube and the second end of the first switch unit respectively, the third end of the fifth switch tube is connected to the third end of the seventh switch tube, and the second end of the sixth switch tube is connected to the second end of the eighth switch tube;

[0016] The first end of the fifth switch tube, the first end of the sixth switch tube, the first end of the seventh switch tube, and the first end of the eighth switch tube are all connected to the controller.

[0017] In one or more embodiments, any switch unit in the resonant configuration network includes a ninth switch tube and a tenth switch tube;

[0018] The second end of the ninth switch tube is the first end of the corresponding switch unit, the third end of the ninth switch tube is connected to the third end of the tenth switch tube, the second end of the tenth switch tube is the second end of the corresponding switch unit, and the first end of the ninth switch tube and the first end of the tenth switch tube are both connected to the controller.

[0019] In one or more embodiments, any switch tube in the voltage conversion circuit is an NMOS tube;

[0020] The first end of any switch tube in the voltage conversion circuit is the gate of the NMOS tube, the second end of any switch tube in the voltage conversion circuit is the source of the NMOS tube, and the third end of any switch tube in the voltage conversion circuit is the drain of the NMOS tube.

[0021] In one or more embodiments, the voltage conversion circuit further includes a first capacitor and a second capacitor;

[0022] The first capacitor is connected in parallel with the first switch network, and the second capacitor is connected in parallel with the second switch network.

[0023] In a second aspect, an embodiment of the present application provides a control method, which is applied to the voltage conversion circuit as described above, comprising:

[0024] determining functions of the first switch network and the second switch network;

[0025] receiving an input voltage range, an output voltage range, and a load range, and based on the input voltage range, the output voltage range, and the load range, controlling at least one of the first switch unit and the second switch unit to be turned on, and controlling at least one of the third switch unit and the fourth switch unit to be turned on;

[0026] Based on the functions of the first switch network and the second switch network, the switch tubes in the first switch network and the second switch network are controlled to be turned on or off.

[0027] In one or more embodiments, when the first switch network is used to generate a PFM waveform and the second switch network is used for rectification, controlling at least one of the first switch unit and the second switch unit to be turned on, and controlling at least one of the third switch unit and the fourth switch unit to be turned on, comprises:

[0028] Controlling the first switch unit and the second switch unit to be turned on, and controlling the third switch unit and the fourth switch unit to be turned off;

[0029] Alternatively, the second switch unit, the third switch unit and the fourth switch unit are controlled to be turned on, and the first switch unit is controlled to be turned off.

[0030] In one or more embodiments, when the first switch network is used for rectification and the second switch network is used for generating a PFM waveform, controlling at least one of the first switch unit and the second switch unit to be turned on, and controlling at least one of the third switch unit and the fourth switch unit to be turned on, comprises:

[0031] Controlling the first switch unit and the third switch unit to be turned on, and controlling the second switch unit and the fourth switch unit to be turned off;

[0032] Alternatively, the second switch unit and the fourth switch unit are controlled to be turned on, and the first switch unit and the third switch unit are controlled to be turned off.

[0033] In a third aspect, an embodiment of the present application provides a controller, including:

[0034] at least one processor and memory;

[0035] The memory is coupled to the processor, and is used to store instructions or programs. When the instructions or programs are executed by the at least one processor, the at least one processor executes the control method as described above.

[0036] The beneficial effects of the present application are as follows: the voltage conversion circuit of the embodiment of the present application includes a first switch network, a second switch network, a resonant configuration network and a controller. Among them, the first switch network includes a first bridge arm unit and a second bridge arm unit connected in parallel, and the first switch network is used to rectify or generate a PFM waveform. The second switch network includes a third bridge arm unit and a fourth bridge arm unit connected in parallel, and the second switch network is used to rectify or generate a PFM waveform. The resonant configuration network includes a first inductor, a second inductor, a first capacitor, a second capacitor, a first switch unit, a second switch unit, a third switch unit and a fourth switch unit. The first inductor and the second inductor are connected in series between the first end of the first switch unit and the first end of the second switch unit, the first capacitor and the second capacitor are connected in series between the first end of the third switch unit and the first end of the fourth switch unit, the first node is connected to the second node, the first end of the first switch unit is connected to the second bridge arm unit, the second end of the first switch unit is respectively connected to the second end of the fourth switch unit and the third bridge arm unit, the second end of the second switch unit is respectively connected to the second end of the third switch unit and the fourth bridge arm unit, and the first end of the fourth switch unit is connected to the first bridge arm unit, wherein the first node is the connection point between the first inductor and the second inductor, and the second node is the connection point between the first capacitor and the second capacitor. Among them, at least one of the first switch unit and the fourth switch unit is configured to be turned on, and at least one of the second switch unit and the third switch unit is configured to be turned on. The controller is respectively connected to the switch tubes in the first switch network, the second switch network and the resonant configuration network to control the conduction or shutoff of the switch tubes in the first switch network, the second switch network and the resonant configuration network. Furthermore, in different application scenarios, the controller only needs to control the first switch unit, the second switch unit, the third switch unit and the fourth switch unit according to the actual application scenario to obtain a resonant network that meets the requirements of different application scenarios. Then, the voltage conversion circuit can be applied to different application scenarios and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] One or more embodiments are exemplarily described by the figures in the accompanying drawings, which are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.

[0038] Figure 1 is a schematic diagram of a component block diagram of a voltage conversion circuit provided in an embodiment of the present application;

[0039] Figure 2 is with Figure 1 The circuit structure diagram corresponding to the composition block diagram shown;

[0040] Figure 3 yes Figure 2Schematic diagram of each signal in the circuit structure shown Figure 1 ;

[0041] Figure 4 yes Figure 2 Schematic diagram of each signal in the circuit structure shown Figure 2 ;

[0042] Figure 5 is a flow chart of a control method provided by an embodiment of the present application;

[0043] Figure 6 It is a schematic diagram of the structure of the controller provided in the embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and in detail below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0045] It should be noted that, when an element is described as being “connected to” another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.

[0046] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no structural conflict between them.

[0047] Please refer to Figure 1 , Figure 1 Schematic diagram of a block diagram of a voltage conversion circuit 100 provided in an embodiment of the present application. Figure 1 As shown, the voltage conversion circuit 100 includes a first switch network 10, a second switch network 20, a resonant configuration network 30 and a controller 40. The first switch network 10 includes a first bridge arm unit 11 and a second bridge arm unit 12 connected in parallel. The second switch network 20 includes a third bridge arm unit 21 and a fourth bridge arm unit 22 connected in parallel. The resonant configuration network 30 includes a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a first switch unit 31, a second switch unit 32, a third switch unit 33 and a fourth switch unit 34.

[0048] The first inductor L1 and the second inductor L2 are connected in series between the first end of the first switch unit 31 and the first end of the second switch unit 32, the first capacitor C1 and the second capacitor C2 are connected in series between the first end of the third switch unit 33 and the first end of the fourth switch unit 34, the first node N1 is connected to the second node N2, the first end of the first switch unit 31 is connected to the second bridge arm unit 12, the second end of the first switch unit 31 is respectively connected to the second end of the fourth switch unit 34 and the fourth bridge arm unit 22, the second end of the second switch unit 32 is respectively connected to the second end of the third switch unit 33 and the third bridge arm unit 21, and the first end of the fourth switch unit 34 is connected to the first bridge arm unit 11, wherein the first node N1 is the connection point between the first inductor L1 and the second inductor L2, and the second node N2 is the connection point between the first capacitor C1 and the second capacitor C2. The controller 40 is respectively connected to the switch tube in the first switch network 10, the switch tube in the second switch network 20, and the switch tube in the resonant configuration network 30.

[0049] Specifically, the first switch network 10 is used to rectify or generate a PFM waveform. The second switch network 20 is used to rectify or generate a PFM waveform. At least one of the first switch unit 31 and the fourth switch unit 34 is configured to be turned on, and at least one of the second switch unit 32 and the third switch unit 33 is configured to be turned on. The controller 40 is used to control the on or off of the switch tube in the first switch network 10, and to control the on or off of the switch tube in the second switch network 20 and to control the on or off of the switch tube in the resonant configuration network 30. Among them, PFM (Pulse Frequency Modulation) is a modulation technology that encodes information by changing the frequency of the pulse. PFM can represent different data values ​​by adjusting the time interval between two adjacent pulses. The PFM waveform includes a series of pulses, the duty cycle of which is usually fixed, but the interval between them (i.e., the period) varies according to the information to be transmitted. When the data value to be transmitted is large, the interval between the pulses will become larger; conversely, when the data value is small, the interval between the pulses will decrease.

[0050] In practical applications, when the left side of the voltage conversion circuit 100 is used for input voltage and the right side is used for output voltage, the corresponding voltage conversion circuit 100 works in the forward direction, then the first switch network 10 is used to generate a PFM waveform based on the input voltage (wherein, the input voltage at both ends of the first switch network 10), and the second switch network 20 is used for the output voltage after rectification (wherein, the output voltage at both ends of the second switch network 20), and the voltage conversion circuit 100 can achieve a step-up or step-down process; when the right side of the voltage conversion circuit 100 is used for input voltage and the left side is used for output voltage, the corresponding voltage conversion circuit 100 works in the reverse direction, then the second switch network 20 is used to generate a PFM waveform based on the input voltage, and the first switch network 10 is used for the output voltage after rectification, and the voltage conversion circuit 100 can achieve a step-up or step-down process. In summary, the forward and reverse step-up and step-down processes of the voltage conversion circuit 100 are realized, that is, the bidirectional working process of the voltage conversion circuit 100 is realized. Secondly, for different application scenarios, the controller 40 only needs to control the first switch unit 31, the second switch unit 32, the third switch unit 33 and the fourth switch unit 34 according to the actual application scenario (for example, the first switch unit 31 and the second switch unit 32 are controlled to be turned on, and the third switch unit 33 and the fourth switch unit 34 are kept turned off), so that the resonant configuration network 30 is configured as a resonant network that meets the requirements of the actual application scenario. Then, the voltage conversion circuit 100 can be applied to different application scenarios and has strong practicality.

[0051] Please refer to Figure 2 , Figure 2 for Figure 1 A circuit structure corresponding to the block diagram shown in FIG. Figure 2 As shown, the first bridge arm unit 11 includes a first switch tube Q1 and a second switch tube Q2, and the second bridge arm unit 12 includes a third switch tube Q3 and a fourth switch tube Q4.

[0052] The second end of the first switch tube Q1 is connected to the third end of the second switch tube Q2 and the first end of the first capacitor C1, the second end of the third switch tube Q3 is connected to the third end of the fourth switch tube Q4 and the first end of the first inductor L1, the third end of the first switch tube Q1 is connected to the third end of the third switch tube Q3, and the second end of the second switch tube Q2 is connected to the second end of the fourth switch tube Q4. The first end of the first switch tube Q1, the first end of the second switch tube Q2, the first end of the third switch tube Q3, and the first end of the fourth switch tube Q4 are all connected to the controller 40 (not shown).

[0053] Specifically, the controller 40 controls the on or off of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 to achieve the function of rectifying or generating a PFM waveform, wherein the specific implementation process of the function of rectifying or generating a PFM waveform is common knowledge in the art and will not be repeated here.

[0054] It should be noted that, in the embodiments of the present application, only a specific implementation method of each switch tube (including the first switch tube Q1 to the tenth switch tube Q10) is illustrated by way of example, while in other embodiments, each switch tube can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon-controlled rectifier (SCR) device, a junction-gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0055] When any of the switch tubes is implemented as an NMOS tube, the gate of the NMOS tube corresponds to the first end of the switch tube, the source of the NMOS tube corresponds to the second end of the switch tube, and the drain of the NMOS tube corresponds to the third end of the switch tube.

[0056] In some embodiments, the third bridge arm unit 21 includes a fifth switch tube Q5 and a sixth switch tube Q6 , and the fourth bridge arm unit 22 includes a seventh switch tube Q7 and an eighth switch tube Q8 .

[0057] Among them, the second end of the fifth switch tube Q5 is respectively connected to the third end of the sixth switch tube Q6 and the second end of the second switch unit 32, the second end of the seventh switch tube Q7 is respectively connected to the third end of the eighth switch tube Q8 and the second end of the first switch unit 31, the third end of the fifth switch tube Q5 is connected to the third end of the seventh switch tube Q7, and the second end of the sixth switch tube Q6 is connected to the second end of the eighth switch tube Q8. The first end of the fifth switch tube Q5, the first end of the sixth switch tube Q6, the first end of the seventh switch tube Q7 and the first end of the eighth switch tube Q8 are all connected to the controller 40 (not shown).

[0058] Specifically, the controller 40 controls the on or off of the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 to achieve the function of rectifying or generating a PFM waveform, wherein the specific implementation process of the function of rectifying or generating a PFM waveform is common knowledge in the art and will not be repeated here.

[0059] In some embodiments, any switch unit in the resonant configuration network 30 includes a ninth switch tube Q9 and a tenth switch tube Q10 .

[0060] Among them, the second end of the ninth switch tube Q9 is the first end of the corresponding switch unit, that is, the second end of the ninth switch tube Q9 in the first switch unit 31 is the first end of the first switch unit 31; the second end of the ninth switch tube Q9 in the second switch unit 32 is the first end of the second switch unit 32; the second end of the ninth switch tube Q9 in the third switch unit 33 is the first end of the third switch unit 33; the second end of the ninth switch tube Q9 in the fourth switch unit 34 is the first end of the fourth switch unit 34. The third end of the ninth switch tube Q9 is connected to the third end of the tenth switch tube Q10. The second end of the tenth switch tube Q10 is the second end of the corresponding switch unit, that is, the second end of the tenth switch tube Q10 in the first switch unit 31 is the second end of the first switch unit 31; the second end of the tenth switch tube Q10 in the second switch unit 32 is the second end of the second switch unit 32; the second end of the tenth switch tube Q10 in the third switch unit 33 is the second end of the third switch unit 33; the second end of the tenth switch tube Q10 in the fourth switch unit 34 is the second end of the fourth switch unit 34. A first terminal of the ninth switch tube Q9 and a first terminal of the tenth switch tube Q10 are both connected to the controller 40 (not shown).

[0061] In some embodiments, the voltage conversion circuit 100 further includes a first capacitor C1 and a second capacitor C2.

[0062] The first capacitor C1 is connected in parallel with the first switch network 10, and the second capacitor C2 is connected in parallel with the second switch network 20. The first capacitor C1 and the second capacitor C2 are used for filtering.

[0063] In some embodiments, the controller 40 controls the ninth switch tube Q9 and the tenth switch tube Q10 in the second switch unit 32 to be turned on, and controls the ninth switch tube Q9 and the tenth switch tube Q10 in the fourth switch unit 34 to be turned on, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the first switch unit 31 turned off, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the third switch unit 33 turned off. At the same time, the controller 40 controls the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 to be turned on or off, so that the second switch network 20 is used to generate a PFM waveform; the controller 40 controls the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 to be turned on or off, so that the first switch network 10 is used for rectification. Thereby, the reverse buck-boost process of the voltage conversion circuit 100 can be realized. In this case, Figure 2 The signals in the circuit structure shown are as follows Figure 3 As shown. Figure 3In the figure, the horizontal axis is the ratio of the switching frequency (i.e., the switching frequency of each switch tube in the first switch network 10 and the second switch network 20) ​​to the resonant frequency (i.e., the resonant frequency of the resonant configuration network 30); the vertical axis is the gain, i.e., the ratio of the voltage output by the voltage conversion circuit 100 to the voltage input; curves L11 to L16 are the gain curves corresponding to the gradually increasing load range, wherein the load range is positively correlated with the rated value of the current output by the voltage conversion circuit 100, i.e., the larger the rated value of the current, the larger the load range; conversely, the smaller the rated value of the current, the smaller the load range. Figure 3 As shown, when the ratio of the switching frequency to the resonant frequency is about 2 times, the gain can be very small (for example, about 0.01) in a larger load range, which can be applied to application scenarios with smaller gain. For example, in some embodiments, the voltage conversion circuit 100 inputs a voltage range of 36V-72V, and the output voltage is 1.2V, then the maximum voltage transformation ratio is 60:1. In this application scenario, a smaller gain is required, which can be achieved through this embodiment.

[0064] In some other embodiments, the controller 40 controls the ninth switch tube Q9 and the tenth switch tube Q10 in the second switch unit 32 to be turned on, and controls the ninth switch tube Q9 and the tenth switch tube Q10 in the fourth switch unit 34 to be turned on, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the first switch unit 31 turned off, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the third switch unit 33 turned off. At the same time, the controller 40 controls the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 to be turned on or off, so that the second switch network 20 is used for rectification; the controller 40 controls the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 to be turned on or off, so that the first switch network 10 is used to generate a PFM waveform. Thus, the forward buck-boost process of the voltage conversion circuit 100 can be realized.

[0065] In some embodiments, the controller 40 controls the ninth switch tube Q9 and the tenth switch tube Q10 in the first switch unit 31 to be turned on, and controls the ninth switch tube Q9 and the tenth switch tube Q10 in the second switch unit 32 to be turned on, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the third switch unit 33 turned off, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the fourth switch unit 34 turned off. At the same time, the controller 40 controls the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 to be turned on or off, so that the second switch network 20 is used for rectification; the controller 40 controls the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 to be turned on or off, so that the first switch network 10 is used to generate a PFM waveform. Thereby, the forward buck-boost process of the voltage conversion circuit 100 can be realized. In this case, Figure 2 The signals in the circuit structure shown are as follows Figure 4 As shown. Figure 4 In the figure, the horizontal axis is the ratio of the switching frequency to the resonant frequency; the vertical axis is the gain; and the curves L21 to L26 are the gain curves corresponding to the gradually increasing load range. Figure 4 As shown, when the switching frequency is equal to the resonant frequency, the gain can be kept greater than 1, which can be applied to application scenarios where the gain is greater than 1. For example, in some embodiments, the voltage conversion circuit 100 inputs a voltage range of 10V-16V, and the output voltage is 24V, then the voltage transformation ratio is greater than 1, and in this application scenario, the gain needs to be greater than 1, which can be achieved through this embodiment.

[0066] In some other embodiments, the controller 40 controls the ninth switch tube Q9 and the tenth switch tube Q10 in the first switch unit 31 to be turned on, and controls the ninth switch tube Q9 and the tenth switch tube Q10 in the second switch unit 32 to be turned on, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the third switch unit 33 turned off, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the fourth switch unit 34 turned off. At the same time, the controller 40 controls the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 to be turned on or off, so that the second switch network 20 is used to generate the PFM waveform; the controller 40 controls the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 to be turned on or off, so that the first switch network 10 is used for rectification. Thus, the reverse buck-boost process of the voltage conversion circuit 100 can be realized.

[0067] The above is only an example of Figure 2In the embodiment, the first switch unit 31, the second switch unit 32, the third switch unit 33 and the fourth switch unit 34 are controlled in several ways to be suitable for different application scenarios. In other embodiments, other control methods can also be adopted according to actual application scenarios, and the embodiments of the present application do not make specific restrictions on this.

[0068] For example, in some embodiments, the controller 40 controls the ninth switch tube Q9 and the tenth switch tube Q10 in the first switch unit 31 to be turned on, and controls the ninth switch tube Q9 and the tenth switch tube Q10 in the third switch unit 33 to be turned on, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the second switch unit 32 turned off, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the fourth switch unit 34 turned off. At the same time, the controller 40 controls the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 to be turned on or off, so that the second switch network 20 is used to generate the PFM waveform; the controller 40 controls the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 to be turned on or off, so that the first switch network 10 is used for rectification. Thus, the reverse buck-boost process of the voltage conversion circuit 100 can be realized.

[0069] For example, in some other embodiments, the controller 40 controls the ninth switch tube Q9 and the tenth switch tube Q10 in the second switch unit 32 to be turned on, controls the ninth switch tube Q9 and the tenth switch tube Q10 in the third switch unit 33 to be turned on, and controls the ninth switch tube Q9 and the tenth switch tube Q10 in the fourth switch unit 34 to be turned on, and keeps the ninth switch tube Q9 and the tenth switch tube Q10 in the first switch unit 31 turned off. At the same time, the controller 40 controls the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 to be turned on or off, so that the second switch network 20 is used for rectification; the controller 40 controls the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 to be turned on or off, so that the first switch network 10 is used to generate a PFM waveform. Thus, the forward buck-boost process of the voltage conversion circuit 100 can be realized.

[0070] Please refer to Figure 5 , Figure 5 Flow chart of the control method provided in the embodiment of the present application. The control method is applied to the voltage conversion circuit 100 in any embodiment of the present application. Figure 5 As shown, the control method includes the following method steps:

[0071] Step 501: Determine functions of a first switch network and a second switch network.

[0072] The function of the first switch network is to rectify or generate a PFM waveform; the function of the second switch network is to rectify or generate a PFM waveform. By determining the functions of the first switch network and the second switch network, it is possible to determine whether the voltage conversion circuit is working in the forward direction or in the reverse direction, wherein when the function of the first switch network is rectification and the function of the second switch network is to generate a PFM waveform, the voltage conversion circuit is working in the reverse direction; when the function of the first switch network is to generate a PFM waveform and the function of the second switch network is rectification, the voltage conversion circuit is working in the forward direction.

[0073] Step 502: Receive an input voltage range, an output voltage range and a load range, and based on the input voltage range, the output voltage range and the load range, control at least one of the first switch unit and the second switch unit to be turned on, and control at least one of the third switch unit and the fourth switch unit to be turned on.

[0074] The input voltage range refers to the range of voltage input to the voltage conversion circuit, and the output voltage range refers to the range of voltage output by the voltage conversion circuit.

[0075] Based on the input voltage range, the output voltage range and the load range, the required resonant network can be determined. Then, each switch unit in the resonant configuration network can be controlled, that is, the first switch unit, the second switch unit, the third switch unit and the fourth switch unit are controlled to be turned on or off, so as to configure the resonant configuration network into the required resonant network.

[0076] In some embodiments, when the first switch network is used to generate a PFM waveform and the second switch network is used for rectification, the specific implementation process of controlling at least one of the first switch unit and the second switch unit to be turned on and controlling at least one of the third switch unit and the fourth switch unit to be turned on in step 502 includes the following steps: controlling the first switch unit and the second switch unit to be turned on, and controlling the third switch unit and the fourth switch unit to be turned off; or, controlling the second switch unit, the third switch unit and the fourth switch unit to be turned on, and controlling the first switch unit to be turned off. The specific implementation process has been described in the above embodiments and will not be repeated here.

[0077] In some embodiments, when the first switch network is used for rectification and the second switch network is used for generating a PFM waveform, the specific implementation process of controlling at least one of the first switch unit and the second switch unit to be turned on and controlling at least one of the third switch unit and the fourth switch unit to be turned on in step 502 includes the following steps: controlling the first switch unit and the third switch unit to be turned on, and controlling the second switch unit and the fourth switch unit to be turned off; or, controlling the second switch unit and the fourth switch unit to be turned on, and controlling the first switch unit and the third switch unit to be turned off. The specific implementation process has been described in the above embodiments and will not be repeated here.

[0078] Step 503: Based on the functions of the first switch network and the second switch network, control the switch tubes in the first switch network and the second switch network to be turned on or off.

[0079] After the resonant configuration network is configured as the desired resonant network, it is only necessary to control the switch tubes in the first switch network and the second switch network to be turned on or off to realize the functions of the first switch network and the second switch network to realize the input voltage range, output voltage range and load range in step 502. It can be seen that through the above control process, the voltage conversion circuit can be applied to different application scenarios and has strong practicality.

[0080] Figure 6 Schematic diagram of the structure of a controller provided by an embodiment of the present application. Figure 6 As shown, the controller 600 includes: at least one processor 601; and a memory 602 that is communicatively connected to the at least one processor 601. Figure 6 The memory 602 stores instructions that can be executed by the at least one processor 601, and the instructions are executed by the at least one processor 601 so that the at least one processor 601 can perform the above Figure 5 The processor 601 and the memory 602 may be connected via a bus or other means. Figure 6 The example of connecting through bus is taken in the following.

[0081] The memory 602 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the control method in the embodiment of the present application, for example, Figure 6 The processor 601 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 602, that is, implements the control method of the above method embodiment.

[0082] The memory 602 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required by at least one function; the data storage area may store data created according to the use of the data transmission device, etc. In addition, the memory 602 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0083] The one or more modules are stored in the memory 602, and when executed by the one or more processors 601, execute the control method in any of the above method embodiments, for example, execute the control method described above. Figure 5 method steps.

[0084] The present application also provides a non-volatile computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, which are executed by one or more processors, for example, to execute the above-described Figure 5 method steps.

[0085] The present application also provides a computer program product, including a computer program stored on a non-volatile computer-readable storage medium, wherein the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the control method in any of the above method embodiments, for example, executing the above described Figure 5 method steps.

[0086] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

[0087] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Under the idea of ​​the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. It should be understood by ordinary technicians in this field that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A voltage conversion circuit, characterized in that: include: A first switch network, comprising a first bridge arm unit and a second bridge arm unit connected in parallel, for rectifying or generating a PFM waveform; A second switch network, comprising a third bridge arm unit and a fourth bridge arm unit connected in parallel, for rectifying or generating a PFM waveform; A resonant configuration network, comprising a first inductor, a second inductor, a first capacitor, a second capacitor, a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, wherein the first inductor and the second inductor are connected in series between a first end of the first switch unit and a first end of the second switch unit, the first capacitor and the second capacitor are connected in series between a first end of the third switch unit and a first end of the fourth switch unit, a first node is connected to a second node, a first end of the first switch unit is connected to the second bridge arm unit, a second end of the first switch unit is respectively connected to a second end of the fourth switch unit and the fourth bridge arm unit, a second end of the second switch unit is respectively connected to a second end of the third switch unit and the third bridge arm unit, and a first end of the fourth switch unit is connected to the first bridge arm unit, wherein the first node is a connection point between the first inductor and the second inductor, and the second node is a connection point between the first capacitor and the second capacitor; Wherein, at least one of the first switch unit and the fourth switch unit is configured to be turned on, and at least one of the second switch unit and the third switch unit is configured to be turned on; The controller is connected to the first switch network, the second switch network and the switch tubes in the resonant configuration network respectively, and the controller is used to control the conduction or shutdown of the switch tubes in the first switch network, the second switch network and the resonant configuration network.

2. The voltage conversion circuit according to claim 1, characterized in that: The first bridge arm unit includes a first switch tube and a second switch tube, and the second bridge arm unit includes a third switch tube and a fourth switch tube; The second end of the first switch tube is connected to the third end of the second switch tube and the first end of the first capacitor respectively, the second end of the third switch tube is connected to the third end of the fourth switch tube and the first end of the first inductor respectively, the third end of the first switch tube is connected to the third end of the third switch tube, and the second end of the second switch tube is connected to the second end of the fourth switch tube; The first end of the first switch tube, the first end of the second switch tube, the first end of the third switch tube, and the first end of the fourth switch tube are all connected to the controller.

3. The voltage conversion circuit according to claim 1, characterized in that: The third bridge arm unit includes a fifth switch tube and a sixth switch tube, and the fourth bridge arm unit includes a seventh switch tube and an eighth switch tube; The second end of the fifth switch tube is connected to the third end of the sixth switch tube and the second end of the second switch unit respectively, the second end of the seventh switch tube is connected to the third end of the eighth switch tube and the second end of the first switch unit respectively, the third end of the fifth switch tube is connected to the third end of the seventh switch tube, and the second end of the sixth switch tube is connected to the second end of the eighth switch tube; The first end of the fifth switch tube, the first end of the sixth switch tube, the first end of the seventh switch tube, and the first end of the eighth switch tube are all connected to the controller.

4. The voltage conversion circuit according to claim 1, characterized in that: Any switch unit in the resonant configuration network includes a ninth switch tube and a tenth switch tube; The second end of the ninth switch tube is the first end of the corresponding switch unit, the third end of the ninth switch tube is connected to the third end of the tenth switch tube, the second end of the tenth switch tube is the second end of the corresponding switch unit, and the first end of the ninth switch tube and the first end of the tenth switch tube are both connected to the controller.

5. The voltage conversion circuit according to any one of claims 1 to 4, characterized in that: Any switch tube in the voltage conversion circuit is an NMOS tube; The first end of any switch tube in the voltage conversion circuit is the gate of the NMOS tube, the second end of any switch tube in the voltage conversion circuit is the source of the NMOS tube, and the third end of any switch tube in the voltage conversion circuit is the drain of the NMOS tube.

6. The voltage conversion circuit according to claim 1, characterized in that: The voltage conversion circuit also includes a first capacitor and a second capacitor; The first capacitor is connected in parallel with the first switch network, and the second capacitor is connected in parallel with the second switch network.

7. A control method, applied to the voltage conversion circuit according to any one of claims 1 to 6, characterized in that: include: determining functions of the first switch network and the second switch network; receiving an input voltage range, an output voltage range, and a load range, and based on the input voltage range, the output voltage range, and the load range, controlling at least one of the first switch unit and the second switch unit to be turned on, and controlling at least one of the third switch unit and the fourth switch unit to be turned on; Based on the functions of the first switch network and the second switch network, the switch tubes in the first switch network and the second switch network are controlled to be turned on or off.

8. The control method according to claim 7, characterized in that: When the first switch network is used to generate a PFM waveform and the second switch network is used for rectification, controlling at least one of the first switch unit and the second switch unit to be turned on, and controlling at least one of the third switch unit and the fourth switch unit to be turned on, comprises: Controlling the first switch unit and the second switch unit to be turned on, and controlling the third switch unit and the fourth switch unit to be turned off; Alternatively, the second switch unit, the third switch unit and the fourth switch unit are controlled to be turned on, and the first switch unit is controlled to be turned off.

9. The control method according to claim 7, characterized in that: When the first switch network is used for rectification and the second switch network is used for generating a PFM waveform, controlling at least one of the first switch unit and the second switch unit to be turned on, and controlling at least one of the third switch unit and the fourth switch unit to be turned on, comprises: Controlling the first switch unit and the third switch unit to be turned on, and controlling the second switch unit and the fourth switch unit to be turned off; Alternatively, the second switch unit and the fourth switch unit are controlled to be turned on, and the first switch unit and the third switch unit are controlled to be turned off.

10. A controller, characterized in that: include: at least one processor and memory; The memory is coupled to the processor, and the memory is used to store instructions or programs. When the instructions or programs are executed by the at least one processor, the at least one processor executes the control method as described in any one of claims 7 to 9.

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