Voltage conversion circuit, voltage conversion method and voltage converter

Abstract

The invention provides a voltage conversion circuit, a voltage conversion method and a voltage converter, and relates to the technical field of voltage conversion, and the voltage conversion circuit comprises a first inductor, a first capacitor, a first switching device, a second switching device, a first energy storage module and a second energy storage module. Under the condition that a first switching device is switched on and a second switching device is switched off, a power supply charges a first inductor, the power supply and a first energy storage module charge a first capacitor, and the power supply and the first energy storage module also charge a second energy storage module, and then under the condition that the first switching device is switched off and the second switching device is switched on, the second energy storage module charges a second capacitor. The power supply and the second energy storage module charge the first energy storage module, and power is supplied to the load through the power supply, the first inductor and the first capacitor, so that compared with the prior art in which power is supplied to the load through the power supply and the inductor, the power supply of the first capacitor is increased, thereby improving the voltage for supplying power to the load, namely improving the boosting capability.

Description

Technical Field

[0001] This application belongs to the field of voltage conversion technology, specifically relating to a voltage conversion circuit, a voltage conversion method, and a voltage converter. Background Technology

[0002] A boost circuit is a DC-to-DC voltage conversion circuit.

[0003] In related technologies, BOOST boost circuits are used for voltage conversion. In a BOOST boost circuit, the inductor is first charged, and then the load is powered by the power supply and the inductor together, thereby achieving boost power supply. However, the boost capability of BOOST boost circuits is weak. Summary of the Invention

[0004] This application aims to provide a voltage conversion circuit, a voltage conversion method, and a voltage converter, which at least solves the problem of weak boost capability of BOOST boost circuits in related technologies.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a voltage conversion circuit, including: a first inductor, a first capacitor, a first switching device, a second switching device, a first energy storage module, and a second energy storage module; the first inductor is electrically connected to the first capacitor and the first switching device, and the first inductor is used to be electrically connected to a power source; the first energy storage module is electrically connected to the first capacitor, the second switching device, and the second energy storage module, and the first energy storage module is used to be electrically connected to the power source; the first capacitor is used to be electrically connected to a load;

[0007] Specifically, when the first switching device is on and the second switching device is off, the power supply charges the first inductor, the power supply and the first energy storage module charge the first capacitor, and the power supply and the first energy storage module also charge the second energy storage module; when the first switching device is off and the second switching device is on, the power supply and the second energy storage module charge the first energy storage module, and the power supply, the first inductor and the first capacitor supply power to the load.

[0008] Optionally, the first energy storage module includes a second inductor, a first diode, and a third inductor; the second energy storage module includes a first energy storage submodule and a second energy storage submodule; the power supply, the second inductor, the first diode, the third inductor, the first capacitor, and the first switching device form a first circuit; the power supply, the second inductor, the first diode, and the second energy storage submodule form a second circuit; the power supply, the second inductor, the first energy storage submodule, the first capacitor, and the first switching device form a third circuit; the power supply, the second inductor, and the second switching device form a fourth circuit; and the first energy storage submodule, the second switching device, the second energy storage submodule, and the third inductor form a fifth circuit.

[0009] Optionally, when the first switching device is on and the second switching device is off, the power supply, the second inductor, and the third inductor jointly charge the first capacitor, the power supply and the second inductor jointly charge the first energy storage submodule, and the power supply and the second inductor also jointly charge the second energy storage submodule; when the first switching device is off and the second switching device is on, the power supply charges the second inductor, and the first energy storage submodule and the second energy storage submodule jointly charge the third inductor.

[0010] Optionally, the first energy storage submodule includes at least one second capacitor, and the second energy storage submodule includes at least one third capacitor; the power supply, the second inductor, each of the second capacitors, the first capacitor, and the first switching device constitute the third circuit; the power supply, the second inductor, the first diode, and each of the third capacitors constitute the second circuit; and each of the second capacitors, the second switching device, each of the third capacitors, and the third inductor constitute the fifth circuit.

[0011] Optionally, the voltage conversion circuit further includes a third energy storage module; the third energy storage module is electrically connected to the first capacitor and is used to be electrically connected to the load; wherein, when the first switching device is turned on and the second switching device is turned off, the third energy storage module supplies power to the load; when the first switching device is turned off and the second switching device is turned on, the power supply, the first inductor, and the first capacitor also charge the third energy storage module.

[0012] Optionally, the third energy storage module includes a second diode and a fourth capacitor; the fourth capacitor and the load form a sixth circuit; the power supply, the first inductor, the first capacitor, the second diode, and the fourth capacitor form a seventh circuit; wherein, when the first switching device is on and the second switching device is off, the fourth capacitor supplies power to the load; when the first switching device is off and the second switching device is on, the power supply, the first inductor, and the first capacitor also charge the fourth capacitor.

[0013] Optionally, when the first switching device is turned on and the second switching device is turned on, the power supply charges the first inductor, and the power supply and the second energy storage module charge the first energy storage module.

[0014] Secondly, embodiments of this application provide a voltage conversion method applied to the voltage conversion circuit described in the first aspect, the method comprising:

[0015] In the first time period of each cycle, the first inductor is charged by the power supply, the first capacitor is charged by the power supply and the first energy storage module, and the second energy storage module is also charged by the power supply and the first energy storage module.

[0016] In the second time period of each cycle, the first energy storage module is charged through the power supply and the second energy storage module, and the load is powered through the power supply, the first inductor and the first capacitor.

[0017] Optionally, the method further includes: charging the first inductor through the power supply during the third time period of each cycle, and charging the first energy storage module through the power supply and the second energy storage module.

[0018] Thirdly, embodiments of this application provide a voltage converter, including the voltage conversion circuit as described in the first aspect, or implementing the voltage conversion method as described in the second aspect.

[0019] In this embodiment, when the first switching device is on and the second switching device is off, the power supply charges the first inductor, the power supply and the first energy storage module charge the first capacitor, and the power supply and the first energy storage module also charge the second energy storage module. Then, when the first switching device is off and the second switching device is on, the power supply and the second energy storage module charge the first energy storage module, and power is supplied to the load through the power supply, the first inductor and the first capacitor. Compared with the related technology where the power supply and inductor supply the load, the voltage supplied to the load is increased due to the addition of the power supply of the first capacitor, that is, the boost capability is improved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0021] Figure 1 This is a schematic diagram of a voltage conversion circuit provided in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the current flow direction of a voltage conversion circuit provided in an embodiment of this application;

[0023] Figure 3 This is another schematic diagram of the current flow direction of the voltage conversion circuit provided in the embodiments of this application;

[0024] Figure 4 This is another schematic diagram of current flow in the voltage conversion circuit provided in the embodiments of this application;

[0025] Figure 5 This is a schematic diagram of the result curve of a simulation experiment provided in an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the result curve of another simulation experiment provided in this application embodiment;

[0027] Figure 7 This is a schematic diagram of the result curve of another simulation experiment provided in the embodiments of this application;

[0028] Figure 8 This is a schematic diagram of the result curve of another simulation experiment provided in the embodiments of this application;

[0029] Figure 9 This is a flowchart of the steps of a voltage conversion method provided in an embodiment of this application.

[0030] Figure label:

[0031] 10 - First energy storage module; 20 - Second energy storage module; 21 - First energy storage sub-module; 22 - Second energy storage sub-module; 30 - Third energy storage module; 40 - Power supply; 50 - Load; S1 - First switching device; S2 - Second switching device; L1 - First inductor; L2 - Second inductor; L3 - Third inductor; C1 - First capacitor; C2 - Second capacitor; C3 - Third capacitor; C4 - Fourth capacitor; D1 - First diode; D2 - Second diode; D3 - Third diode. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] Reference Figure 1 This application provides a voltage conversion circuit, including: a first inductor L1, a first capacitor C1, a first switching device S1, a second switching device S2, a first energy storage module 10, and a second energy storage module 20; the first inductor L1 is electrically connected to the first capacitor C1 and the first switching device S1, and is used to be electrically connected to a power supply 40; the first energy storage module 10 is electrically connected to the first capacitor C1, the second switching device S2, and the second energy storage module 20, and is used to be electrically connected to the power supply 40; the first capacitor C1 is used to be electrically connected to a load 50. The connection is as follows: when the first switching device S1 is on and the second switching device S2 is off, the power supply 40 charges the first inductor L1, the power supply 40 and the first energy storage module 10 charge the first capacitor C1, and the power supply 40 and the first energy storage module 10 also charge the second energy storage module 20; when the first switching device S1 is off and the second switching device S2 is on, the power supply 40 and the second energy storage module 20 charge the first energy storage module 10, and the power supply 40, the first inductor L1 and the first capacitor C1 supply power to the load 50.

[0035] In some embodiments, the voltage conversion circuit further includes a controller, which is electrically connected to the first switching device S1 and the second switching device S2 respectively. The controller is used to control the first switching device S1 to periodically alternately turn on and off, and to control the second switching device S2 to periodically alternately turn on and off.

[0036] In some embodiments, the controller is configured to control the first switching device S1 to be turned on and the second switching device S2 to be turned off during a first time period of each cycle, and to control the first switching device S1 to be turned off and the second switching device S2 to be turned on during a second time period of each cycle.

[0037] In some embodiments, the first switching device S1 has a duty cycle greater than 0.5 in each cycle; the second switching device S2 has a duty cycle greater than 0.5 in each cycle.

[0038] In some embodiments, the controller uses a first pulse width modulation (PWM) signal to control the on / off state of the first switching device S1, and the controller uses a second pulse width modulation signal to control the on / off state of the second switching device S2, wherein the phase of the first pulse width modulation signal is 180 degrees different from the phase of the second pulse width modulation signal.

[0039] In some embodiments, the controller type includes a microcontroller unit (MCU), a single-chip microcomputer, or other types of chips.

[0040] In some embodiments, the first switching device S1 may be a MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor), a triode, a relay, or other types of switching devices.

[0041] In some embodiments, the second switching device S2 may be a MOSFET, a transistor, a relay, or other types of switching devices.

[0042] In this embodiment, when the first switching device S1 is turned on and the second switching device S2 is turned off, the power supply 40 charges the first inductor L1, the power supply 40 and the first energy storage module 10 charge the first capacitor C1, and the power supply 40 and the first energy storage module 10 also charge the second energy storage module 20. Then, when the first switching device S1 is turned off and the second switching device S2 is turned on, the power supply 40 and the second energy storage module 20 charge the first energy storage module 10, and power the load 50 through the power supply 40, the first inductor L1 and the first capacitor C1. Compared with the related technology where the load is powered by the power supply and the inductor, the voltage supplied to the load 50 is increased due to the addition of the power supply of the first capacitor C1, that is, the boost capability is improved.

[0043] Optionally, in some embodiments, the first energy storage module 10 includes a second inductor L2, a first diode D1, and a third inductor L3; the second energy storage module 20 includes a first energy storage submodule 21 and a second energy storage submodule 22; the power supply 40, the second inductor L2, the first diode D1, the third inductor L3, the first capacitor C1, and the first switching device S1 form a first circuit; the power supply 40, the second inductor L2, the first diode D1, and the second energy storage submodule 22 form a second circuit; the power supply 40, the second inductor L2, the first energy storage submodule 21, the first capacitor C1, and the first switching device S1 form a third circuit; the power supply 40, the second inductor L2, and the second switching device S2 form a fourth circuit; and the first energy storage submodule 21, the second switching device S2, the second energy storage submodule 22, and the third inductor L3 form a fifth circuit.

[0044] In some embodiments, the first energy storage module 10 further includes a third diode D3; the first end of the second inductor L2 is electrically connected to the positive terminal of the power supply 40; the second end of the second inductor L2 is electrically connected to the first end of the second switching device S2, the positive terminal of the first diode D1, and the first end of the second energy storage module 20; the negative terminal of the first diode D1 is electrically connected to the first end of the third inductor L3 and the second end of the second energy storage module 20; the second end of the third inductor L3 is electrically connected to the third end of the second energy storage module 20 and the positive terminal of the third diode D3; the negative terminal of the third diode D3 is electrically connected to the second end of the first capacitor C1; wherein, the first end of the second energy storage module 20 is the first end of the first energy storage submodule 21, the second end of the second energy storage module 20 is the first end of the second energy storage submodule 22, and the third end of the second energy storage module 20 is the second end of the first energy storage submodule 21.

[0045] In this embodiment, the first diode D1 is a reverse protection diode; since the power supply 40, the second inductor L2, the first diode D1, the third inductor L3, the first capacitor C1, and the first switching device S1 form a first circuit, the power supply 40, the second inductor L2, and the third inductor L3 can charge the first capacitor C1; since the power supply 40, the second inductor L2, the first diode D1, and the second energy storage submodule 22 form a second circuit, the power supply 40 and the second inductor L2 can charge the second energy storage submodule 22; since the power supply 40, the second inductor L2, the first diode D1, the third inductor D1, the first capacitor C1, and the first switching device S1 form a first circuit, the power supply 40, the second inductor L2, and the third inductor L3 can charge the second energy storage submodule 22; since the power supply 40, the second inductor L2, the first diode D1, the third inductor D1, the first capacitor C1, and the first switching device S1 form a second circuit, ... the second inductor D2, the first inductor D1, the third inductor D1, the first capacitor C1, the second inductor D2, the first inductor D1, the third inductor D1, the first capacitor C1, the second inductor D2, the first inductor D1, the third inductor D1, the first capacitor C1, the third induct A capacitor C1 and a first switching device S1 form a third circuit, so the power supply 40 and the second inductor L2 can charge the first energy storage submodule 21, and the power supply 40 and the second inductor L2 can charge the first capacitor C1; since the power supply 40, the second inductor L2 and the second switching device S2 form a fourth circuit, the power supply 40 can charge the second inductor L2; since the first energy storage submodule 21, the second switching device S2, the second energy storage submodule 22 and the third inductor L3 form a fifth circuit, the first energy storage submodule 21 and the second energy storage submodule 22 can jointly charge the third inductor L3.

[0046] Optionally, in some embodiments, when the first switching device S1 is on and the second switching device S2 is off, the power supply 40, the second inductor L2, and the third inductor L3 jointly charge the first capacitor C1, the power supply 40 and the second inductor L2 jointly charge the first energy storage submodule 21, and the power supply 40 and the second inductor L2 also jointly charge the second energy storage submodule 22; when the first switching device S1 is off and the second switching device S2 is on, the power supply 40 charges the second inductor L2, and the first energy storage submodule 21 and the second energy storage submodule 22 jointly charge the third inductor L3.

[0047] In this embodiment, when the first switching device S1 is turned on and the second switching device S2 is turned off, the power supply 40, the second inductor L2, and the third inductor L3 jointly charge the first capacitor C1, the power supply 40 and the second inductor L2 jointly charge the first energy storage submodule 21, and the power supply 40 and the second inductor L2 also jointly charge the second energy storage submodule 22. Then, when the first switching device S1 is turned off and the second switching device S2 is turned on, the power supply 40 charges the second inductor L2, and the first energy storage submodule 21 and the second energy storage submodule 22 jointly charge the third inductor L3, thereby causing the second inductor L2, the third inductor L3, the first energy storage submodule 21, and the second energy storage submodule 22 to periodically charge and discharge.

[0048] Optionally, in some embodiments, the first energy storage submodule 21 includes at least one second capacitor C2, and the second energy storage submodule 22 includes at least one third capacitor C3; the power supply 40, the second inductor L2, each of the second capacitors C2, the first capacitor C1, and the first switching device S1 constitute the third circuit; the power supply 40, the second inductor L2, the first diode D1, and each of the third capacitors C3 constitute the second circuit; each of the second capacitors C2, the second switching device S2, each of the third capacitors C3, and the third inductor L3 constitute the fifth circuit.

[0049] In some embodiments, the first energy storage submodule 21 includes a second capacitor C2, and the second energy storage submodule 22 includes a third capacitor C3; the first end of the second capacitor C2 is the first end of the second energy storage module 20, the second end of the second capacitor C2 is the third end of the second energy storage module 20, and the first end of the third capacitor C3 is the second end of the second energy storage module 20; the first end of the second capacitor C2 is electrically connected to the second end of the second inductor L2 and the first end of the second switching device S2, respectively; the second end of the second capacitor C2 is electrically connected to the second end of the third inductor L3 and the positive terminal of the third diode D3, respectively; the first end of the third capacitor C3 is electrically connected to the negative terminal of the first diode D1 and the first end of the third inductor L3, respectively; and the second end of the third capacitor C3 is electrically connected to the negative terminal of the power supply 40.

[0050] In this embodiment, since the power supply 40, the second inductor L2, each second capacitor C2, the first capacitor C1, and the first switching device S1 form a third circuit, the power supply 40 and the second inductor L2 can charge each second capacitor C2, and the power supply 40 and the second inductor L2 can charge the first capacitor C1; since the power supply 40, the second inductor L2, the first diode D1, and each third capacitor C3 form a second circuit, the power supply 40 and the second inductor L2 can charge each third capacitor C3; since each second capacitor C2, the second switching device S2, each third capacitor C3, and the third inductor L3 form a fifth circuit, each second capacitor C2 and each third capacitor C3 can charge the third inductor L3.

[0051] Optionally, in some embodiments, the voltage conversion circuit further includes a third energy storage module 30; the third energy storage module 30 is electrically connected to the first capacitor C1, and the third energy storage module 30 is used to be electrically connected to the load 50; wherein, when the first switching device S1 is turned on and the second switching device S2 is turned off, the third energy storage module 30 supplies power to the load 50; when the first switching device S1 is turned off and the second switching device S2 is turned on, the power supply 40, the first inductor L1, and the first capacitor C1 also charge the third energy storage module 30.

[0052] In this embodiment, when the first switching device S1 is off and the second switching device S2 is on, the power supply 40, the first inductor L1, and the first capacitor C1 also charge the third energy storage module 30, and the power supply 40, the first inductor L1, and the first capacitor C1 supply power to the load 50. Then, when the first switching device S1 is on and the second switching device S2 is off, the third energy storage module 30 supplies power to the load 50, thereby achieving a stable power supply to the load 50.

[0053] Optionally, in some embodiments, the third energy storage module 30 includes a second diode D2 and a fourth capacitor C4; the fourth capacitor C4 and the load 50 form a sixth circuit; the power supply 40, the first inductor L1, the first capacitor C1, the second diode D2, and the fourth capacitor C4 form a seventh circuit; wherein, when the first switching device S1 is on and the second switching device S2 is off, the fourth capacitor C4 supplies power to the load 50; when the first switching device S1 is off and the second switching device S2 is on, the power supply 40, the first inductor L1, and the first capacitor C1 also charge the fourth capacitor C4.

[0054] In some embodiments, the positive terminal of the second diode D2 is electrically connected to the second terminal of the first capacitor C1, and the negative terminal of the second diode D2 is electrically connected to the first terminal of the fourth capacitor C4 and the positive terminal of the load 50, respectively; the second terminal of the fourth capacitor C4 is electrically connected to the negative terminal of the load 50 and the negative terminal of the power supply 40, respectively.

[0055] In this embodiment, the second diode D2 is a reverse protection diode. When the first switching device S1 is off and the second switching device S2 is on, the power supply 40, the first inductor L1, and the first capacitor C1 also charge the third energy storage module 30, and the power supply 40, the first inductor L1, and the first capacitor C1 supply power to the load 50. Then, when the first switching device S1 is on and the second switching device S2 is off, the third energy storage module 30 supplies power to the load 50, thereby ensuring the voltage stability of the load 50 and achieving stable power supply to the load 50.

[0056] Optionally, in some embodiments, when the first switching device S1 is turned on and the second switching device S2 is turned on, the power supply 40 charges the first inductor L1, and the power supply 40 and the second energy storage module 20 charge the first energy storage module 10.

[0057] In some embodiments, the controller is further configured to control the first switching device S1 to turn on and the second switching device S2 to turn on during the third time period of each cycle.

[0058] In this embodiment, when the first switching device S1 is on and the second switching device S2 is off, the power supply 40 charges the first inductor L1, the power supply 40 and the first energy storage module 10 charge the first capacitor C1, and the power supply 40 and the first energy storage module 10 also charge the second energy storage module 20. When the first switching device S1 is on and the second switching device S2 is on, the power supply 40 charges the first inductor L1, and the power supply 40 and the second energy storage module 20 charge the first energy storage module 10. Then, when the first switching device S1 is off and the second switching device S2 is on, the power supply 40 and the second energy storage module 20 charge the first energy storage module 10, and the power supply 40, the first inductor L1 and the first capacitor C1 supply power to the load 50, thereby realizing the boost power supply of the load 50.

[0059] In some embodiments, the voltage conversion circuit includes a first inductor L1, a first capacitor C1, a first switching device S1, a second switching device S2, a first energy storage module 10, and a second energy storage module 20; the first energy storage module 10 includes a second inductor L2, a first diode D1, a third diode D3, and a third inductor L3; the second energy storage module 20 includes a second capacitor C2 and a third capacitor C3.

[0060] The first terminal of the first inductor L1 is electrically connected to the positive terminal of the power supply 40. The second terminal of the first inductor L1 is electrically connected to the first terminal of the first switching device S1 and the first terminal of the first capacitor C1, respectively. The first terminal of the first switching device S1 is electrically connected to the first terminal of the first capacitor C1, and the second terminal of the first switching device S1 is electrically connected to the negative terminal of the power supply 40. The first terminal of the second inductor L2 is electrically connected to the positive terminal of the power supply 40. The second terminal of the second inductor L2 is electrically connected to the first terminal of the second switching device S2, the positive terminal of the first diode D1, and the first terminal of the second capacitor C2, respectively. The negative terminal of the first diode D1 is electrically connected to the first terminal of the third inductor L3 and the first terminal of the third capacitor C3, respectively. The second terminal of the third inductor L3 is electrically connected to the second terminal of the second capacitor C2 and the positive terminal of the third diode D3, respectively. The negative terminal of the third diode D3 is electrically connected to the second terminal of the first capacitor C1. The first terminal of the second switching device S2 is electrically connected to the first terminal of the second capacitor C2, and the second terminal of the second switching device S2 is electrically connected to the negative terminal of the power supply 40.

[0061] The second terminal of the second capacitor C2 is electrically connected to the positive terminal of the third diode D3; the first terminal of the third capacitor C3 is electrically connected to the negative terminal of the first diode D1 and the first terminal of the third inductor L3, respectively; the second terminal of the third capacitor C3 is electrically connected to the negative terminal of the power supply 40; the positive terminal of the second diode D2 is electrically connected to the second terminal of the first capacitor C1, and the negative terminal of the second diode D2 is electrically connected to the first terminal of the fourth capacitor C4 and the positive terminal of the load 50, respectively; the second terminal of the fourth capacitor C4 is electrically connected to the negative terminal of the load 50 and the negative terminal of the power supply 40, respectively.

[0062] Reference Figure 2 In some embodiments, when the first switching device S1 is turned on and the second switching device S2 is turned off, the voltage conversion circuit operates in the first mode. Current I1 flows out from the positive terminal of the power supply 40 along the h1 direction, then I1 is split into currents I11 and I12. Current I11 flows along the h2 direction through the first inductor L1, and along the h3 direction through the first switching device S1, then flows out from the second terminal of the first switching device S1 along the h4 direction, and then along the h5 direction to the negative terminal of the power supply 40. Current I12 flows along the h6 direction through the second inductor L2, then I12 is split into currents I121 and I122. Current I121 flows along the h6 direction through the first diode D1, and then... Current I121 is split into current I121a and current I121b. Current I121a flows along the h12 direction through the third capacitor C3, then flows out from the second end of the third capacitor C3 along the h4 direction, and then flows to the negative terminal of the power supply 40 along the h5 direction. Current I122 flows along the h7 direction to the first end of the second capacitor C2, then flows along the h8 direction through the second capacitor C2 and the third diode D3 in sequence, then flows along the h10 direction to the second end of the first capacitor C1, then flows out from the first end of the first capacitor C1 along the h11 direction, then flows along the h3 direction through the first switching device S1, then flows out from the second end of the first switching device S1 along the h4 direction, and then flows to the negative terminal of the power supply 40 along the h5 direction.

[0063] The current I121b flows along the h9 direction through the third inductor L3, then along the h8 direction through the second capacitor C2 and the third diode D3 in sequence, then along the h10 direction to the second terminal of the first capacitor C1, then from the first terminal of the first capacitor C1 along the h11 direction, then along the h3 direction through the first switching device S1, then from the second terminal of the first switching device S1 along the h4 direction, and then along the h5 direction to the negative terminal of the power supply 40; the current output from the first terminal of the fourth capacitor C4 flows out along the h13 direction, then along the h14 direction to the positive terminal of the load 50, then along the h15 direction through the load 50, then from the negative terminal of the load 50 along the h16 direction, and then along the h17 direction to the second terminal of the fourth capacitor C4.

[0064] Reference Figure 3In some embodiments, when the first switching device S1 is turned on and the second switching device S2 is turned on, the voltage conversion circuit operates in the second mode. Current I2 flows out from the positive terminal of the power supply 40 along the h1 direction, and then the current I2 is split into current I21 and current I22. Current I21 flows through the first inductor L1 along the h2 direction, and through the first switching device S1 along the h3 direction, and then flows out from the second terminal of the first switching device S1 along the h19 direction, and then flows to the negative terminal of the power supply 40 along the h5 direction. Current I22 flows through the second inductor L2 along the h21 direction, and then through the second switching device S2 along the h18 direction, and then flows out along the second terminal of the second switching device S2 along the h19 direction, and then flows to the negative terminal of the power supply 40 along the h5 direction.

[0065] The current output from the first terminal of the second capacitor C2 flows out along the h22 direction, then along the h23 direction to the positive terminal of the first diode D1, then along the h18 direction through the second switching device S2, and then along the h24 direction to the second terminal of the third capacitor C3. The current output from the first terminal of the third capacitor C3 flows along the h20 direction to the first terminal of the third inductor L3, then along the h9 direction through the third inductor L3, and then along the h22 direction to the second terminal of the second capacitor C2. The current output from the first terminal of the fourth capacitor C4 flows out along the h13 direction, then along the h14 direction to the positive terminal of the load 50, then along the h15 direction through the load 50, and from the negative terminal of the load 50 along the h16 direction, and then along the h17 direction to the second terminal of the fourth capacitor C4.

[0066] Reference Figure 4 In some embodiments, when the first switching device S1 is off and the second switching device S2 is on, the voltage conversion circuit operates in the third mode. Current I3 flows out from the positive terminal of power supply 40 along the h1 direction, and then current I3 is split into current I31 and current I32. Current I31 flows along the h2 direction through the first inductor L1, the first capacitor C1, and the second diode D2 in sequence. Subsequently, current I31 is split into current I311 and current I312. Current I311 flows along the h25 direction to the fourth capacitor C4. One end, then flows out from the second end of the fourth capacitor C4 along the h26 direction, and then flows to the negative terminal of the power supply 40 along the h27 direction; the current I312 flows to the positive terminal of the load 50 along the h14 direction, then passes through the load 50 along the h15 direction, and then flows to the negative terminal of the power supply 40 along the h27 direction; the current I32 passes through the second inductor L2 along the h21 direction, then passes through the second switching device S2 along the h18 direction, then flows out along the second end of the second switching device S2 along the h19 direction, and then flows to the negative terminal of the power supply 40 along the h5 direction;

[0067] The current output from the first terminal of the second capacitor C2 flows out along the h22 direction, then flows along the h23 direction to the positive terminal of the first diode D1, then flows along the h18 direction through the second switching device S2, and then flows along the h24 direction to the second terminal of the third capacitor C3. The current output from the first terminal of the third capacitor C3 flows along the h20 direction to the first terminal of the third inductor L3, then flows along the h9 direction through the third inductor L3, and then flows along the h22 direction to the second terminal of the second capacitor C2.

[0068] In some embodiments, the voltage of the first switching device S1 when it is open is:

[0069] US1 = [1 / (1-D)] × Uin

[0070] Wherein, US1 is the voltage of the first switching device S1 when it is off, Uin is the voltage of the power supply 40, and D is the duty cycle of the first switching device S1 in each cycle.

[0071] In some embodiments, the voltage of the second switching device S2 when it is open is:

[0072] US2 = [1 / (1-D)] × Uin

[0073] US2 is the voltage of the second switching device S2 when it is open.

[0074] In some embodiments, the voltage of the first capacitor C1 is:

[0075] UC1=[1 / (1-D)]×Uin

[0076] Wherein, UC1 is the voltage of the first capacitor C1.

[0077] In some embodiments, the voltage of the second capacitor C2 is:

[0078] UC2=[(1+D) / (1-D)]×Uin

[0079] Wherein, UC2 is the voltage of the second capacitor C2.

[0080] In some embodiments, the voltage of the third capacitor C3 is:

[0081] UC3=[1 / (1-D)]×Uin

[0082] Wherein, UC3 is the voltage of the third capacitor C3.

[0083] In some embodiments, the voltage of the fourth capacitor C4 and the output voltage of the voltage conversion circuit are:

[0084] UC4=U_out=[(2+D) / (1-D)]×Uin

[0085] Where UC4 is the voltage of the fourth capacitor C4, and U_out is the output voltage of the voltage conversion circuit, that is, the supply voltage of the load 50.

[0086] In some embodiments, the reverse voltage of the first diode D1 when it is turned off is:

[0087] UD1 = [1 / (1-D)] × Uin

[0088] Wherein, UD1 is the reverse voltage of the first diode D1 when it is turned off.

[0089] In some embodiments, the reverse voltage of the second diode D2 when it is turned off is:

[0090] UD2=[2 / (1-D)]×Uin

[0091] Wherein, UD2 is the reverse voltage of the second diode D2 when it is turned off.

[0092] In some embodiments, the reverse voltage of the third diode D3 when it is turned off is:

[0093] UD3=[1 / (1-D)]×Uin

[0094] UD3 is the reverse voltage of the third diode D3 when it is turned off.

[0095] In some embodiments, the current through the first inductor L1 is:

[0096] iL1=[1 / (1-D)]×i_0

[0097] Where iL1 is the current through the first inductor L1, and i_0 is the current of the load 50, that is, the output current of the voltage conversion circuit.

[0098] In some embodiments, the current through the second inductor L2 is:

[0099] iL2=[(1+D) / (1-D)]×i_0

[0100] Where iL2 is the current passing through the second inductor L2.

[0101] In some embodiments, the current through the third inductor L3 is:

[0102] iL3=i_0

[0103] Where iL3 is the current passing through the third inductor L3.

[0104] In some embodiments, the voltage conversion circuit provided in the embodiments of this application is simulated using simulation software. The simulation parameters are: the voltage of power supply 40 is 48 volts, and the duty cycle of the first switching device S1 and the duty cycle of the second switching device S2 in each cycle are both 0.6.

[0105] Reference Figure 5 The simulation results generate curves including curve X1, curve X2, curve X3, curve X4, curve X5, and curve X6, among which, for example... Figure 5 (a) In a coordinate system with current I as the vertical axis and time t as the horizontal axis, curve X1 is the curve showing the change of current through the first inductor L1 over time, curve X2 is the curve showing the change of current through the second inductor L2 over time, and curve X3 is the curve showing the change of current through the third inductor L3 over time; as Figure 5 (b) In a coordinate system with voltage U as the vertical axis and time t as the horizontal axis, curve X4 is the curve of the voltage of the second capacitor C2 changing with time, curve X5 is the curve of the voltage of the first capacitor C1 changing with time, and curve X6 is the curve of the voltage of the third capacitor C3 changing with time.

[0106] Reference Figure 6 The simulation results also include curves X7, X8, X9, X10, X11, and X12, among which, for example... Figure 6 (c) In a coordinate system with voltage U as the vertical axis and time t as the horizontal axis, curve X7 is the curve showing the reverse voltage of the first diode D1 changing with time when it is turned off; curve X8 is the curve showing the reverse voltage of the third diode D3 changing with time when it is turned off; and curve X9 is the curve showing the reverse voltage of the second diode D2 changing with time when it is turned off. Figure 6 (d) In a coordinate system with voltage U as the vertical axis and time t as the horizontal axis, curve X10 is the curve of the voltage of the second switching device S2 changing with time when it is open, curve X11 is the curve of the voltage of the first switching device S1 changing with time when it is open, and curve X12 is the curve of the output voltage of the voltage conversion circuit changing with time.

[0107] The curves generated by the simulation results show that the simulation results are consistent with the theoretical calculation results. For example, curve X12 shows that the output voltage of the voltage conversion circuit is 312 volts, and U_out=[(2+D) / (1-D)]×Uin=[(2+0.6) / (1-0.6)]×48 volts=312 volts. Therefore, the simulation results of the output voltage of the voltage conversion circuit are consistent with the theoretical calculation results.

[0108] In some embodiments, the voltage conversion circuit provided in the embodiments of this application is simulated using simulation software. The simulation parameters are: the voltage of power supply 40 is 48 volts, and the voltage of power supply 40 jumps to 38 volts at 0.2 seconds. The duty cycle of the first switching device S1 and the duty cycle of the second switching device S2 in each cycle are both adjusted by the controller.

[0109] Reference Figure 7 The results of the simulation experiment resulted in curves X13 and X14. In a coordinate system with voltage U as the vertical axis and time t as the horizontal axis, curve X13 is the curve of the voltage of power supply 40 changing with time, and curve X14 is the curve of the output voltage of the voltage conversion circuit changing with time.

[0110] As can be seen from curve X14, before the 0.2-second mark, the output voltage of the voltage conversion circuit is 312 volts. After the 0.2-second mark, approximately 20 milliseconds later, the output voltage of the voltage conversion circuit stabilizes at 312 volts. This indicates that by adjusting the duty cycle of the first switching device S1 and the duty cycle of the second switching device S2 in each cycle by the controller, the output voltage of the voltage conversion circuit is kept at 312 volts after approximately 20 milliseconds.

[0111] In some embodiments, the voltage conversion circuit provided in this application embodiment is simulated using simulation software. The simulation parameters are: the voltage of power supply 40 is 48 volts, the resistance of load 50 is 400 ohms, the rated power of load 50 is 243 watts, the resistance of load 50 changes to 500 ohms at 0.2 seconds, the rated power of load 50 changes to 194 watts, and the duty cycle of the first switching device S1 and the duty cycle of the second switching device S2 in each cycle are both 0.6.

[0112] Reference Figure 8 The results of the simulation experiment resulted in curves X15 and X16. In a coordinate system with voltage U as the vertical axis and time t as the horizontal axis, curve X15 shows the voltage of power supply 40 changing with time. In a coordinate system with current I as the vertical axis and time t as the horizontal axis, curve X16 shows the output voltage of the voltage conversion circuit changing with time.

[0113] As can be seen from curve X15, before the 0.2-second mark, the output voltage of the voltage conversion circuit is 312 volts. After the 0.2-second mark, approximately 30 milliseconds later, the output voltage of the voltage conversion circuit stabilizes at 312 volts. This indicates that by adjusting the duty cycle of the first switching device S1 and the duty cycle of the second switching device S2 in each cycle by the controller, the output voltage of the voltage conversion circuit is maintained at 312 volts after approximately 30 milliseconds.

[0114] Therefore, the voltage conversion circuit provided in this application embodiment has strong output voltage anti-interference capability when the input voltage is disturbed and the load power is disturbed.

[0115] Reference Figure 9 This application also provides a voltage conversion method applied to the voltage conversion circuit described above, the method comprising the following steps:

[0116] Step 101: In the first time period of each cycle, the first inductor L1 is charged by the power supply 40, the first capacitor C1 is charged by the power supply 40 and the first energy storage module 10, and the second energy storage module 20 is also charged by the power supply 40 and the first energy storage module 10.

[0117] The implementation method for this step is similar to that described above, and will not be repeated here.

[0118] Step 102: In the second time period of each cycle, the first energy storage module 10 is charged through the power supply 40 and the second energy storage module 20, and the load 50 is powered through the power supply 40, the first inductor L1 and the first capacitor C1.

[0119] The implementation method for this step is similar to that described above, and will not be repeated here.

[0120] Optionally, in some embodiments, the method further includes the following steps:

[0121] Step 103: In the third time period of each cycle, the first inductor L1 is charged through the power supply 40, and the first energy storage module 10 is charged through the power supply 40 and the second energy storage module 20.

[0122] The implementation method for this step is similar to that described above, and will not be repeated here.

[0123] In this embodiment, during the first time period of each cycle, the first inductor L1 is charged by the power supply 40, and the first capacitor C1 is charged by the power supply 40 and the first energy storage module 10. The second energy storage module 20 is also charged by the power supply 40 and the first energy storage module 10. Then, during the second time period of each cycle, the first energy storage module 10 is charged by the power supply 40 and the second energy storage module 20. The load 50 is powered by the power supply 40, the first inductor L1, and the first capacitor C1. Compared with the related technology where the load is powered by the power supply and the inductor, the voltage supplied to the load 50 is increased due to the addition of the power supply to the first capacitor C1, which improves the boost capability.

[0124] This application provides a voltage converter, including the voltage conversion circuit as described above, or a voltage conversion method as described above.

[0125] The specific implementation of the voltage conversion circuit in the voltage converter is similar to that described above, and will not be repeated here.

[0126] In related technologies, the input voltage range of the BOOST boost circuit is narrow, making it impossible to achieve a low startup voltage, and the voltage stress on the switching transistor is relatively high, which limits the selection of the switching transistor.

[0127] In this embodiment, the load 50 is powered by the power supply 40, the first inductor L1, and the first capacitor C1. Compared with the related technology where the load is powered by the power supply and the inductor, the addition of the first capacitor C1 increases the voltage supplied to the load 50, thereby adapting to a wider range of input voltages, achieving a lower startup voltage, and reducing the voltage stress on the switching transistor, thus increasing the freedom of selection for the switching transistor (i.e., the switching device).

[0128] In related technologies, cascaded circuits are required to achieve high voltage boost in BOOST boost circuits, such as three-stage cascaded circuits. However, this requires three switching transistors, and the voltage stress on the switching transistors is high.

[0129] In this embodiment, the number of switching devices is two, resulting in fewer switching devices and lower voltage stress.

[0130] In related technologies, flyback circuits are used to achieve voltage conversion. However, flyback circuits rely on the turns ratio of the primary and secondary sides of the transformer to achieve voltage boost. The leakage inductance brought by the transformer increases the voltage stress on the switching transistor and the duty cycle is limited by magnetic reset, which causes a very large voltage spike to the switching transistor. Therefore, an RCD (resistor, capacitor, diode) circuit is needed to absorb it. A large turns ratio leads to increased size, reduced power density, complex manufacturing, and difficult parameter calculation and design.

[0131] In this embodiment, when the first switching device S1 is turned on and the second switching device S2 is turned off, the power supply 40 charges the first inductor L1, the power supply 40 and the first energy storage module 10 charge the first capacitor C1, and the power supply 40 and the first energy storage module 10 also charge the second energy storage module 20. Then, when the first switching device S1 is turned off and the second switching device S2 is turned on, the power supply 40 and the second energy storage module 20 charge the first energy storage module 10, and the power supply 40, the first inductor L1 and the first capacitor C1 supply power to the load 50. Since this embodiment does not require a transformer, it avoids the leakage inductance caused by the transformer, which increases the voltage stress of the switching transistor and limits the duty cycle due to magnetic reset, as well as the problems of increased size, reduced power density, complex manufacturing and difficult parameter calculation and design caused by a large turns ratio.

[0132] The voltage conversion circuit provided in this application embodiment can be applied to scenarios requiring high voltage boost capability, such as distributed photovoltaic energy storage systems and fuel cell drone systems. Compared with existing converters, it has advantages such as higher voltage boost capability, lower switching transistor stress, wider input voltage range, inductor interleaving and parallel connection, simple control method, and simple structure, providing more options for engineering implementation.

[0133] Compared to related technologies, the embodiments of this application have higher boost voltage capability, which can improve the power utilization rate of photovoltaic panels in photovoltaic systems and facilitate maximum power point tracking (MPPT) in photovoltaic inverter systems. While improving the output voltage capability, it can reduce the voltage stress on the switching transistors. The control strategy is simple, the input inductors are interleaved and parallel, and the structure is concise. In addition, the embodiments of this application do not require a transformer to have high boost voltage capability, and the voltage stress on the switching transistors remains consistent, which facilitates the selection of subsequent switching transistors. It is also more convenient in parameter calculation and device selection, and broadens the choices for subsequent applications.

[0134] In summary, in this embodiment, when the first switching device S1 is on and the second switching device S2 is off, the power supply 40 charges the first inductor L1, the power supply 40 and the first energy storage module 10 charge the first capacitor C1, and the power supply 40 and the first energy storage module 10 also charge the second energy storage module 20. Then, when the first switching device S1 is off and the second switching device S2 is on, the power supply 40 and the second energy storage module 20 charge the first energy storage module 10, and power the load 50 through the power supply 40, the first inductor L1 and the first capacitor C1. Compared with the related technology where the load is powered by the power supply and the inductor, the voltage supplied to the load 50 is increased due to the addition of the power supply of the first capacitor C1, that is, the boost capability is improved.

[0135] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0136] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A voltage conversion circuit, characterized in that, include: The system comprises a first inductor (L1), a first capacitor (C1), a first switching device (S1), a second switching device (S2), a first energy storage module (10), and a second energy storage module (20). The first inductor (L1) is electrically connected to the first capacitor (C1) and the first switching device (S1), and is used to be electrically connected to the power supply (40). The first energy storage module (10) is electrically connected to the first capacitor (C1), the second switching device (S2), and the second energy storage module (20), and is used to be electrically connected to the power supply (40). The first capacitor (C1) is used to be electrically connected to the load (50). When the first switching device (S1) is on and the second switching device (S2) is off, the power supply (40) charges the first inductor (L1), the power supply (40) and the first energy storage module (10) charge the first capacitor (C1), and the power supply (40) and the first energy storage module (10) also charge the second energy storage module (20); when the first switching device (S1) is off and the second switching device (S2) is on, the power supply (40) and the second energy storage module (20) charge the first energy storage module (10), and the power supply (40), the first inductor (L1) and the first capacitor (C1) supply power to the load (50).

2. The voltage conversion circuit according to claim 1, characterized in that, The first energy storage module (10) includes a second inductor (L2), a first diode (D1), and a third inductor (L3); the second energy storage module (20) includes a first energy storage submodule (21) and a second energy storage submodule (22); The power supply (40), the second inductor (L2), the first diode (D1), the third inductor (L3), the first capacitor (C1), and the first switching device (S1) constitute the first circuit; The power supply (40), the second inductor (L2), the first diode (D1), and the second energy storage submodule (22) form the second circuit; The power supply (40), the second inductor (L2), the first energy storage submodule (21), the first capacitor (C1), and the first switching device (S1) form a third circuit; The power supply (40), the second inductor (L2), and the second switching device (S2) form a fourth circuit; The first energy storage submodule (21), the second switching device (S2), the second energy storage submodule (22), and the third inductor (L3) form the fifth circuit.

3. The voltage conversion circuit according to claim 2, characterized in that, When the first switching device (S1) is turned on and the second switching device (S2) is turned off, the power supply (40), the second inductor (L2) and the third inductor (L3) jointly charge the first capacitor (C1), the power supply (40) and the second inductor (L2) jointly charge the first energy storage submodule (21), and the power supply (40) and the second inductor (L2) also jointly charge the second energy storage submodule (22). When the first switching device (S1) is off and the second switching device (S2) is on, the power supply (40) charges the second inductor (L2), and the first energy storage submodule (21) and the second energy storage submodule (22) together charge the third inductor (L3).

4. The voltage conversion circuit according to claim 2, characterized in that, The first energy storage submodule (21) includes at least one second capacitor (C2), and the second energy storage submodule (22) includes at least one third capacitor (C3); The power supply (40), the second inductor (L2), each of the second capacitors (C2), the first capacitor (C1), and the first switching device (S1) constitute the third circuit; The power supply (40), the second inductor (L2), the first diode (D1), and each of the third capacitors (C3) constitute the second circuit; Each of the second capacitor (C2), the second switching device (S2), each of the third capacitors (C3) and the third inductor (L3) constitutes the fifth circuit.

5. The voltage conversion circuit according to claim 1, characterized in that, The voltage conversion circuit also includes a third energy storage module (30); The third energy storage module (30) is electrically connected to the first capacitor (C1), and the third energy storage module (30) is used to be electrically connected to the load (50); When the first switching device (S1) is turned on and the second switching device (S2) is turned off, the third energy storage module (30) supplies power to the load (50); when the first switching device (S1) is turned off and the second switching device (S2) is turned on, the power supply (40), the first inductor (L1) and the first capacitor (C1) also charge the third energy storage module (30).

6. The voltage conversion circuit according to claim 5, characterized in that, The third energy storage module (30) includes a second diode (D2) and a fourth capacitor (C4); The fourth capacitor (C4) and the load (50) form the sixth circuit; The power supply (40), the first inductor (L1), the first capacitor (C1), the second diode (D2), and the fourth capacitor (C4) constitute the seventh circuit; When the first switching device (S1) is turned on and the second switching device (S2) is turned off, the fourth capacitor (C4) supplies power to the load (50); when the first switching device (S1) is turned off and the second switching device (S2) is turned on, the power supply (40), the first inductor (L1) and the first capacitor (C1) also charge the fourth capacitor (C4).

7. The voltage conversion circuit according to any one of claims 1 to 6, characterized in that, When the first switching device (S1) is turned on and the second switching device (S2) is turned on, the power supply (40) charges the first inductor (L1), and the power supply (40) and the second energy storage module (20) charge the first energy storage module (10).

8. A voltage transformation method, characterized in that, Applied to the voltage conversion circuit as described in any one of claims 1 to 7, the method comprises: In the first time period of each cycle, the first inductor (L1) is charged by the power supply (40), the first capacitor (C1) is charged by the power supply (40) and the first energy storage module (10), and the second energy storage module (20) is also charged by the power supply (40) and the first energy storage module (10). In the second time period of each cycle, the first energy storage module (10) is charged through the power supply (40) and the second energy storage module (20), and the load (50) is powered through the power supply (40), the first inductor (L1) and the first capacitor (C1).

9. The method according to claim 8, characterized in that, The method further includes: In the third time period of each cycle, the first inductor (L1) is charged by the power supply (40), and the first energy storage module (10) is charged by the power supply (40) and the second energy storage module (20).

10. A voltage converter, characterized in that, Includes a voltage conversion circuit as described in any one of claims 1 to 7, or implements a voltage conversion method as described in claim 8 or 9.

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