Voltage conversion circuit, control method thereof, and controller

Abstract

The present application discloses a voltage conversion circuit and its control method and controller. The voltage conversion circuit includes a first switch network, a second switch network, a resonant configuration network and a controller. The first switch network is used to rectify or generate a PFM waveform. 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 switch unit and the second switch unit, 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 to the first switch network, the first switch unit is connected to the fourth switch unit and the third bridge arm unit, and the second switch unit is connected to the third switch unit and the fourth bridge arm unit. Through the above method, it can be applied to different application scenarios and has strong practicality.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of electronic circuit, in particular to a voltage conversion circuit and a control method and a controller thereof. BACKGROUND

[0002] In the application of micro power module, more and more applications involve battery charging and discharging. Battery charging and discharging requires that the converter can work bidirectionally, and the micro power module usually does not need to be isolated. The conventional non-isolated topology has a buck topology, a boost topology or a buck-boost topology. Among them, the buck-boost topology can be designed to work bidirectionally. However, since the buck-boost topology is a hard switching topology, the turn-on and turn-off of the power device is neither zero voltage switching nor zero current switching, and the switching loss is large, and the efficiency is low. Therefore, a resonant converter with small switching loss and high efficiency can be selected, such as an LLC resonant converter or an LCC resonant converter.

[0003] However, the current resonant converter is only suitable for a specific application scenario, and has great limitations. SUMMARY

[0004] The embodiment of the present application provides a voltage conversion circuit and a control method and a controller thereof, which can be applied to different application scenarios and has strong practicability.

[0005] In a first aspect, the 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] The resonant 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, 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, a first node and a second node are connected, the first end of the first switch unit is connected with the second bridge arm unit, the second end of the first switch unit is connected with the second end of the fourth switch unit and the fourth bridge arm unit respectively, the second end of the second switch unit is connected with the second end of the third switch unit and the third bridge arm unit respectively, and the first end of the fourth switch unit is connected with 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] 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] A controller is connected with the switch tubes in the first switch network, the second switch network and the resonant configuration network respectively, and is used to control the turn-on or turn-off 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 comprises a first switch tube and a second switch tube, and the second bridge arm unit comprises a third switch tube and a fourth switch tube.

[0012] The second end of the first switch tube is connected with 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 with 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 with the third end of the third switch tube, and the second end of the second switch tube is connected with 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 with the controller.

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

[0015] The second end of the fifth switch tube is connected with 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 with 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 with the third end of the seventh switch tube, and the second end of the sixth switch tube is connected with 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 connected with the controller.

[0017] In one or more embodiments, any switch unit in the resonant configuration network comprises 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 with 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 connected with 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 comprises 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, the embodiments of the present application provide a control method, applied to the voltage conversion circuit as described above, comprising:

[0024] Determining the 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 functions of the first switch network and the second switch network, control on / off of the switch tubes in the first switch network and the second switch network.

[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, the control on the at least one of the first switch unit and the second switch unit, and the control on the at least one of the third switch unit and the fourth switch unit, comprises:

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

[0029] or, controlling the second switch unit, the third switch unit and the fourth switch unit on, and controlling the first switch unit off.

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

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

[0032] or, controlling the second switch unit and the fourth switch unit on, and controlling the first switch unit and the third switch unit off.

[0033] In a third aspect, the embodiments of the present application provide a controller, comprising:

[0034] at least one processor and a memory;

[0035] The memory is coupled to the processor, and the memory is configured 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 application has the beneficial effects that: the voltage conversion circuit of the application embodiment includes a first switch network, a second switch network, a resonant configuration network, and a controller. The first switch network includes a first bridge arm unit and a second bridge arm unit connected in parallel, and is used for rectification or generating a PFM waveform. The second switch network includes a third bridge arm unit and a fourth bridge arm unit connected in parallel, and is used for rectification or generating 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 a first end of the first switch unit and a first end of the second switch unit, and 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 and a second node are connected, 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 third 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 fourth bridge arm unit, and a first end of the fourth switch unit is connected to the first bridge arm unit. 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. 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 switch tubes in the first switch network, the second switch network, and the resonant configuration network, to control the turn-on or turn-off of the switch tubes in the first switch network, the second switch network, and the resonant configuration network. 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. Therefore, the voltage conversion circuit can be applied to different application scenarios, and has strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0037] One or more embodiments are illustrated by way of example in the figures that form a part of this patent document. These illustrations are not configured to limit the embodiments, and elements having the same reference numbers in the figures indicate similar elements.

[0038] Figure 1 is a schematic diagram of a constituent block diagram of a voltage conversion circuit provided by the application embodiment;

[0039] Figure 2 is a circuit structure schematic diagram corresponding to the constituent block diagram shown in Figure 1 ;

[0040] Figure 3 is Figure 2schematic of each signal in the circuit structure shown Figure 1 ;

[0041] Figure 4 is Figure 2 schematic of each signal in the circuit structure shown Figure 2 ;

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

[0043] Figure 6 is a structural schematic diagram of the controller provided by the embodiments of the present application. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments but not all of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0045] It should be noted that when one element is described as being "connected" to another element, it can be directly connected to the other element or one or more intermediate elements can exist between them.

[0046] In addition, the technical features involved in each of the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0047] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of the voltage conversion circuit 100 provided by the embodiments of the present application. As shown in Figure 1 , 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 and the second node N2 are connected, the first end of the first switch unit 31 is connected with the second bridge arm unit 12, the second end of the first switch unit 31 is connected with the second end of the fourth switch unit 34 and the fourth bridge arm unit 22 respectively, the second end of the second switch unit 32 is connected with the second end of the third switch unit 33 and the third bridge arm unit 21 respectively, and the first end of the fourth switch unit 34 is connected with 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 connected with the switch tubes in the first switch network 10, the switch tubes in the second switch network 20 and the switch tubes in the resonant configuration network 30 respectively.

[0049] Specifically, the first switch network 10 is used for rectification or generating a PFM waveform. The second switch network 20 is used for rectification or generating 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 for controlling the turn-on or turn-off of the switch tubes in the first switch network 10, and is used for controlling the turn-on or turn-off of the switch tubes in the second switch network 20 and the turn-on or turn-off of the switch tubes in the resonant configuration network 30. Wherein, PFM (Pu l seFrequency Modu l at i on) is a modulation technique that encodes information by changing the frequency of pulses. PFM can represent different data values by adjusting the time interval between two adjacent pulses. The PFM waveform includes a series of pulses, and the duty cycle of these pulses is usually fixed, but the interval (i.e. period) between them will change according to the information to be transmitted. When the data value to be transmitted is large, the interval between pulses will be large; on the contrary, when the data value is small, the interval between 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, corresponding to the forward working of the voltage conversion circuit 100, the first switch network 10 is used to generate a PFM waveform based on the input voltage (where the input voltage is applied across the first switch network 10), and the second switch network 20 is used to output the voltage after rectification (where the output voltage is applied across the second switch network 20), and the voltage conversion circuit 100 can realize the process of step-up or step-down; when the right side of the voltage conversion circuit 100 is used for input voltage and the left side is used for output voltage, corresponding to the reverse working of the voltage conversion circuit 100, 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 to output the voltage after rectification, and the voltage conversion circuit 100 can realize the process of step-up or step-down. In summary, the forward and reverse step-up and step-down processes of the voltage conversion circuit 100 are realized, i.e. 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 (such as controlling the first switch unit 31 and the second switch unit 32 to be turned on and keeping the third switch unit 33 and the fourth switch unit 34 turned off) to make the resonant configuration network 30 be 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 the corresponding circuit structure shown in the block diagram. As shown in Figure 2 , the first bridge arm unit 11 includes the first switch tube Q1 and the second switch tube Q2, and the second bridge arm unit 12 includes the third switch tube Q3 and the fourth switch tube Q4.

[0052] Wherein, the second end of the first switch tube Q1 is connected with the third end of the second switch tube Q2 and the first end of the first capacitor C1 respectively, the second end of the third switch tube Q3 is connected with the third end of the fourth switch tube Q4 and the first end of the first inductor L1 respectively, the third end of the first switch tube Q1 is connected with the third end of the third switch tube Q3, and the second end of the second switch tube Q2 is connected with 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 with the controller 40 (not shown in the figure).

[0053] Specifically, the controller 40 controls the conduction or turn-off of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 to realize the functions of rectification or PFM waveform generation, wherein the specific implementation process of the functions of rectification or PFM waveform generation is well known in the art, and will not be described here.

[0054] It should be noted that in the embodiments of the present application, only a specific implementation of each switch tube (including the first switch tube Q1 to the tenth switch tube Q10) is exemplarily shown, and 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] The second end of the fifth switch tube Q5 is connected to the third end of the sixth switch tube Q6 and the second end of the second switch unit 32, respectively, the second end of the seventh switch tube Q7 is connected to the third end of the eighth switch tube Q8 and the second end of the first switch unit 31, respectively, 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 in the figure).

[0058] Specifically, the controller 40 controls the conduction or turn-off of the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7, and the eighth switch tube Q8 to realize the function of rectification or generation of a PFM waveform, and the specific implementation process of the function of rectification or generation of a PFM waveform is well known in the art, which will not be described here.

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

[0060] The second end of the ninth switch Q9 is the first end of the corresponding switch unit, i.e., the second end of the ninth switch Q9 in the first switch unit 31 is the first end of the first switch unit 31; the second end of the ninth switch Q9 in the second switch unit 32 is the first end of the second switch unit 32; the second end of the ninth switch Q9 in the third switch unit 33 is the first end of the third switch unit 33; and the second end of the ninth switch Q9 in the fourth switch unit 34 is the first end of the fourth switch unit 34. The third end of the ninth switch Q9 is connected with the third end of the tenth switch Q10. The second end of the tenth switch Q10 is the second end of the corresponding switch unit, i.e., the second end of the tenth switch Q10 in the first switch unit 31 is the second end of the first switch unit 31; the second end of the tenth switch Q10 in the second switch unit 32 is the second end of the second switch unit 32; the second end of the tenth switch Q10 in the third switch unit 33 is the second end of the third switch unit 33; and the second end of the tenth switch Q10 in the fourth switch unit 34 is the second end of the fourth switch unit 34. The first end of the ninth switch Q9 and the first end of the tenth switch Q10 are connected with the controller 40 (not shown in the figure).

[0061] In some embodiments, the voltage conversion circuit 100 further comprises 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 Q9 and the tenth switch Q10 in the second switch unit 32 to be turned on, and controls the ninth switch Q9 and the tenth switch Q10 in the fourth switch unit 34 to be turned on, and keeps the ninth switch Q9 and the tenth switch Q10 in the first switch unit 31 turned off, and keeps the ninth switch Q9 and the tenth switch Q10 in the third switch unit 33 turned off. At the same time, the controller 40 controls the fifth switch Q5, the sixth switch Q6, the seventh switch Q7 and the eighth switch Q8 to be turned on or turned off, so that the second switch network 20 is used to generate a PFM waveform; the controller 40 controls the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 to be turned on or turned 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. In this case, Figure 2 The signals in the circuit structure shown are as shown in the figure. Figure 3 The signals in the circuit structure shown are as shown in the figure. Figure 3In the figure, the horizontal axis is the ratio of the switching frequency (i.e., the switching frequency of each switch in the first switching network 10 and the second switching 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 approximately 2 times, the gain can be very small (e.g., approximately 0.01) over a wide load range, making it suitable for applications with relatively low gain. For example, in some embodiments, the voltage conversion circuit 100 has an input voltage range of 36V-72V and an output voltage of 1.2V, resulting in a maximum voltage transformation ratio of 60:1. In this application scenario, a relatively low gain is required, which can be achieved through this embodiment.

[0064] In other embodiments, the controller 40 turns on the ninth and tenth switches Q9 and Q10 in the second switch unit 32 and turns on the ninth and tenth switches Q9 and Q10 in the fourth switch unit 34. Furthermore, the controller 40 turns off the ninth and tenth switches Q9 and Q10 in the first switch unit 31 and turns off the ninth and tenth switches Q9 and Q10 in the third switch unit 33. Simultaneously, the controller 40 turns on or off the fifth, sixth, seventh, and eighth switches Q5, Q6, Q7, and Q8 to enable the second switch network 20 to perform rectification. The controller 40 also turns on or off the first, second, third, and fourth switches Q1, Q2, Q3, and Q4 to enable the first switch network 10 to generate a PFM waveform. This allows the voltage converter circuit 100 to perform a forward buck-boost process.

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

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

[0067] The above only exemplarily shows the process of step-up and step-down of the voltage conversion circuit 100 in the forward direction. Figure 2The first switch unit 31, the second switch unit 32, the third switch unit 33 and the fourth switch unit 34 in the voltage conversion circuit 100 can be controlled in different ways to adapt to different application scenarios. In other embodiments, other control methods can also be used according to the actual application scenario, and the embodiments of the present application do not make specific limitations in this regard.

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

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

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

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

[0072] The function of the first switch network is rectification or generating a PFM waveform; the function of the second switch network is rectification or generating a PFM waveform. By determining the functions of the first switch network and the second switch network, it can be determined whether the voltage conversion circuit is working in a forward direction or a reverse direction. When the function of the first switch network is rectification and the function of the second switch network is generating a PFM waveform, the voltage conversion circuit is working in a reverse direction; when the function of the first switch network is generating a PFM waveform and the function of the second switch network is rectification, the voltage conversion circuit is working in a forward direction.

[0073] Step 502: 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.

[0074] The input voltage range refers to the range of the voltage input to the voltage conversion circuit, and the output voltage range refers to the range of the 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, the first switch unit, the second switch unit, the third switch unit and the fourth switch unit in the resonant configuration network can be controlled to be turned on or turned off 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 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 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 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 turned off.

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

[0080] Figure 6 is a structural schematic diagram of a controller provided by an embodiment of the present application. As shown in Figure 6 , the controller 600 includes at least one processor 601 and a memory 602 communicatively connected with the at least one processor 601, Figure 6 of which the processor 601 is taken as an example. The memory 602 stores instructions executable by the at least one processor 601, and the instructions are executed by the at least one processor 601 to enable the at least one processor 601 to execute the above Figure 5 control method. The processor 601 and the memory 602 can be connected through a bus or other means, Figure 6 of which the connection through a bus is taken as an example.

[0081] The memory 602 is a non-volatile computer readable storage medium, which can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as the program instructions / modules corresponding to the control method in the embodiments of the present application, for example, various modules shown in 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, realizes the control method of the above method embodiments.

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

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

[0084] The embodiments of the present application also provide a nonvolatile computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are executed by one or more processors, for example, perform the method steps described above. Figure 5

[0085] The embodiments of the present application also provide a computer program product, which includes a computer program stored on a nonvolatile computer readable storage medium, and the computer program includes program instructions, and when the program instructions are executed by a computer, the computer performs the control method in any of the above method embodiments, for example, performs the method steps described above. Figure 5

[0086] The above description is merely an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation according to the content of the specification and drawings, or direct or indirect application 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, and not to limit them; the technical features between the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some technical features can be replaced 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 includes 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 includes 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 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, 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 connected to the second end of the fourth switch unit and the fourth bridge arm unit, a second end of the second switch unit is connected to the 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; A 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 first switch network, the second switch network, and the switch tubes in the resonant configuration network.

2. The voltage conversion circuit according to claim 1, wherein: 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 switching transistor is connected to the third end of the second switching transistor and the first end of the first capacitor, the second end of the third switching transistor is connected to the third end of the fourth switching transistor and the first end of the first inductor, the third end of the first switching transistor is connected to the third end of the third switching transistor, and the second end of the second switching transistor is connected to the second end of the fourth switching transistor. 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, wherein: 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 switching tube is connected to the third end of the sixth switching tube and the second end of the second switching unit respectively; the second end of the seventh switching tube is connected to the third end of the eighth switching tube and the second end of the first switching unit respectively; the third end of the fifth switching tube is connected to the third end of the seventh switching tube; and the second end of the sixth switching tube is connected to the second end of the eighth switching 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, wherein: 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, wherein: The voltage conversion circuit further 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 switching network and the second switching network; receiving an input voltage range, an output voltage range, and a load range, and 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 input voltage range, the output voltage range, and the load range; 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, includes: 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, includes: 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 according to any one of claims 7 to 9.

Images