Conversion circuit, charging module and charging equipment

Abstract

The embodiment of the invention provides a conversion circuit, a charging module and charging equipment. The conversion circuit comprises a resonant conversion circuit; the resonant conversion circuit comprises a first switching module, and a switch module, a resonant module, a voltage transformation module and a rectification module which are connected in sequence; wherein the switch module comprises four switch tube units; the first switching module is connected with the four switching tube units and is used for switching the four switching tube units into a full-bridge topological structure or a half-bridge topological structure; wherein under the full-bridge topological structure, the first switching tube unit and the second switching tube unit are connected in series, and the third switching tube unit and the fourth switching tube unit are connected in series; under the half-bridge topological structure, the first switching tube unit and the third switching tube unit are connected in parallel, and the second switching tube unit and the fourth switching tube unit are connected in parallel. The circuit can realize constant power output in a wide voltage range.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of charging, and in particular, to a conversion circuit, a charging module, and a charging device. Background Art

[0002] The LLC resonant conversion circuit is a DC-DC conversion circuit based on the resonance principle. According to the arrangement of internal switching tubes, the topological structure of the LLC resonant conversion circuit can be divided into half-bridge or full-bridge types. The LLC resonant conversion circuit is often used in charging modules to convert the initial power supply voltage to supply power to electrical devices.

[0003] In practical applications, in the constant power output scenario, the target output voltages required by different models of electrical devices may vary greatly, while the voltage output range of a single LLC resonant conversion circuit has certain limitations and is difficult to meet the requirements of constant power output with a wide voltage range, resulting in poor adaptability. Summary of the Invention

[0004] The embodiments of the present application provide a conversion circuit, a charging module, and a charging device to broaden the constant power voltage output range of the conversion circuit and improve the flexibility and adaptability of the conversion circuit.

[0005] On the one hand, the embodiments of the present application provide a conversion circuit, and the circuit includes: a resonant conversion circuit; the resonant conversion circuit includes a first switching module and a switching module, a resonant module, a voltage conversion module, and a rectification module connected in sequence; wherein,

[0006] The switching module includes four switching tube units;

[0007] The first switching module is connected to the four switching tube units and is used to switch the four switching tube units to a full-bridge topological structure or a half-bridge topological structure; wherein, in the full-bridge topological structure, the first switching tube unit and the second switching tube unit are connected in series, and the third switching tube unit and the fourth switching tube unit are connected in series; in the half-bridge topological structure, the first switching tube unit and the third switching tube unit are connected in parallel, and the second switching tube unit and the fourth switching tube unit are connected in parallel.

[0008] In the above solution, by setting the first switching module, the first switching module can switch the switching module to the full-bridge topological structure during high-voltage output, and the first switching module can switch the switching module to the half-bridge topological structure during low-voltage output, so that the conversion circuit can achieve twice the voltage gain in the range near the resonance frequency, thereby realizing a wide-range and high-efficiency constant power voltage output, effectively broadening the low-voltage constant power voltage range; and, during low-voltage output, the parallel switching tube units meet the current-carrying capacity, meet the temperature rise requirements, and reduce device losses.

[0009] In some embodiments, under a full-bridge topology, the first arm of the switching module includes the first switching tube unit and the second switching tube unit connected in series, and the second arm of the switching module includes the third switching tube unit and the fourth switching tube unit connected in series; under a half-bridge topology, the upper arm of the switching module includes the first switching tube unit and the third switching tube unit connected in parallel, and the lower arm of the switching module includes the second switching tube unit and the fourth switching tube unit connected in parallel.

[0010] In some embodiments, the first switching module includes: a first switch, a second switch, and a third switch; wherein,

[0011] The first throwing end of the first switch is connected to the first end of the fourth switching tube unit, the second throwing end of the first switch is connected to the second end of the fourth switching tube unit, and the common end of the first switch is connected to the second input end of the resonant module;

[0012] One end of the second switch is connected to the second end of the first switching tube unit, and the other end of the second switch is connected to the second end of the third switching tube unit;

[0013] One end of the third switch is connected to the first end of the second switching tube unit, and the other end of the third switch is connected to the first end of the fourth switching tube unit;

[0014] When the first throwing end and the common end of the first switch are conducted, and the second switch and the third switch are disconnected, the four switching tube units form a full-bridge topology;

[0015] When the second throwing end and the common end of the first switch are conducted, and the second switch and the third switch are conducted, the four switching tube units form a half-bridge topology.

[0016] In the above solution, by controlling the conduction or disconnection of the first switch, the second switch, and the third switch, the connection relationship between the four switching tube units can be changed to achieve the purpose of switching the four switching tube units to a full-bridge topology or a half-bridge topology.

[0017] In some embodiments, the number of the resonant conversion circuits is multiple, and the circuit further includes: a plurality of second switching modules, and the plurality of second switching modules are connected to the plurality of resonant conversion circuits for switching the plurality of resonant conversion circuits to a parallel mode or a series mode.

[0018] In the above solution, through the second switching module, multiple resonant conversion circuits are switched to parallel or series modes. When the conversion circuit outputs a low voltage, by setting multiple resonant conversion circuits to the parallel mode, the current in each resonant conversion circuit can be effectively reduced, avoiding losses to the devices. When the conversion circuit outputs a high voltage, multiple resonant conversion circuits can be set to the series mode to achieve the sharing of the output voltage and reliably output a high voltage, thereby further expanding the voltage output range and improving the flexibility and adaptability of the conversion circuit.

[0019] In some embodiments, the second switching module includes: a fourth switch, a fifth switch, and a sixth switch; the first output terminal and the second output terminal of each resonant conversion circuit are respectively connected to the first input terminal and the second input terminal of the load; wherein,

[0020] Except for the last resonant conversion circuit, the fourth switch is provided between the second output terminal of each resonant conversion circuit and the first input terminal of the next resonant conversion circuit, and the fifth switch is provided between the second output terminal of each resonant conversion circuit and the second input terminal of the load; except for the first resonant conversion circuit, the sixth switch is provided between the first output terminal of each resonant conversion circuit and the first input terminal of the load;

[0021] In the above solution, the connection relationship between the resonant conversion circuits and the connection relationship between the resonant conversion circuits and the load are controlled by the fourth switch, the fifth switch, and the sixth switch to achieve the purpose of configuring the output terminals of multiple resonant conversion circuits in parallel or series.

[0022] In some embodiments, the second switching module includes: a fourth switch, a fifth switch, and a sixth switch;

[0023] The first output terminal of the first resonant conversion circuit is used to connect to the first input terminal of the load, the second output terminal of the first resonant conversion circuit, one end of the fourth switch, and one end of the fifth switch are connected, and the other end of the fifth switch is used to connect to the second input terminal of the load;

[0024] The first input terminal of the second resonant conversion circuit, the other end of the fourth switch, and one end of the sixth switch are connected, the second output terminal of the second resonant conversion circuit is used to connect to the second input terminal of the load, and the other end of the sixth switch is used to connect to the first input terminal of the load;

[0025] In the parallel mode, the fourth switch is turned off, and the fifth switch and the sixth switch are turned on;

[0026] In the series mode, the fourth switch is turned on, and the fifth switch and the sixth switch are turned off.

[0027] In the above solution, by turning on or off the connection between the second output terminal of the first resonant conversion circuit and the first input terminal of the second resonant conversion circuit through the fourth switch, turning on or off the connection between the second output terminal of the first resonant conversion circuit and the load through the fifth switch, and turning on or off the connection between the first output terminal of the second resonant conversion circuit and the load through the sixth switch, the purpose of configuring the output terminals of the first resonant conversion circuit and the second resonant conversion circuit in parallel or in series is achieved.

[0028] In some embodiments, when the target output voltage value of the conversion circuit is greater than the first threshold, the first switching module is configured to switch the four switching tube units to a full-bridge topology; the second switching module is configured to switch the plurality of resonant conversion circuits to a series mode;

[0029] When the target output voltage value of the conversion circuit is not greater than the first threshold and greater than the second threshold, the first switching module is configured to switch the four switching tube units to a half-bridge topology; the second switching module is configured to switch the plurality of resonant conversion circuits to a series mode;

[0030] When the target output voltage value of the conversion circuit is not greater than the second threshold and greater than the third threshold, the first switching module is configured to switch the four switching tube units to a full-bridge topology; the second switching module is configured to switch the plurality of resonant conversion circuits to a parallel mode;

[0031] When the target output voltage value of the conversion circuit is not greater than the third threshold, the first switching module is configured to switch the four switching tube units to a half-bridge topology; the second switching module is configured to switch the plurality of resonant conversion circuits to a parallel mode.

[0032] In the above solution, by using four conversion circuit modes, the voltage gain can be changed, so that the conversion circuit can operate in an efficient region, thereby being able to flexibly adapt to four voltage output requirements, effectively achieving constant power output while protecting the devices.

[0033] In some embodiments, when the target output voltage value of the conversion circuit is not greater than the third threshold and greater than the fourth threshold, the four switching tube units receive a pulse frequency modulation signal;

[0034] When the target output voltage value of the conversion circuit is not greater than the fourth threshold, the four switching tube units receive a pulse width modulation signal.

[0035] In the above solution, when the output voltage of the conversion circuit is extremely low, a pulse width modulation signal can be used to control the switching tube unit in the switching module, effectively optimizing the operating frequency, reducing the deviation from the resonance point, and thus reducing the loss of the switching tube unit; when the output voltage of the conversion circuit is not extremely low, a pulse frequency modulation signal can be used to control the switching tube unit in the switching module, effectively improving the efficiency, and thus effectively improving the performance of the conversion circuit.

[0036] In some embodiments, when the target output voltage value of the conversion circuit is not greater than the fifth threshold, the four switching tube units operate in a hiccup mode; the fifth threshold is less than the fourth threshold.

[0037] In the above solution, when the target output voltage value is not greater than the fifth threshold, the gain of the conversion circuit is very low. Therefore, the four switching tube units operate in a hiccup mode, and the output voltage of the switching module is converted from a continuous mode to a discontinuous mode, reducing the equivalent input voltage of the resonance module, thereby reducing the output voltage and improving the efficiency and dynamic response of the system.

[0038] In some embodiments, the number of the second switching modules is one more than the number of the resonant conversion circuits.

[0039] In the above solution, one second switching module is correspondingly arranged for every two adjacent resonant conversion circuits. Through the second switching module, the connection relationship of the two adjacent resonant conversion circuits can be changed, so as to achieve the purpose of switching multiple resonant conversion circuits into a parallel mode or a series mode.

[0040] On the other hand, an embodiment of the present application provides a charging module, including the conversion circuit as described above.

[0041] In the above solution, wide-range constant power output can be achieved through the conversion circuit, which can meet the requirements of various electrical equipment and effectively improve the flexibility and adaptability of power supply.

[0042] On another aspect, an embodiment of the present application provides a charging device, including the charging module as described above.

[0043] In the above solution, by setting the first switching module, the first switching module can switch the switching module to a full-bridge topology structure during high-voltage output, and the first switching module can switch the switching module to a half-bridge topology structure during low-voltage output, so that the conversion circuit can achieve a double voltage gain in the range near the resonance frequency, thereby realizing wide-range high-efficiency constant power voltage output and effectively broadening the low-voltage constant power voltage range; and, during low-voltage output, the parallel switching tube units are used to meet the current-carrying capacity, meet the temperature rise requirements, and reduce the device loss.

[0044] The conversion circuit, charging module, and charging device provided by the embodiments of the present application can, by setting a first switching module, switch the switching module to a full-bridge topology structure during high-voltage output, and switch the switching module to a half-bridge topology structure during low-voltage output, so that the conversion circuit can achieve a double voltage gain in the vicinity of the resonance frequency, thereby realizing a wide-range and high-efficiency constant-power voltage output, effectively broadening the low-voltage constant-power voltage range; and, during low-voltage output, the current-carrying capacity is satisfied by the parallel-connected switching tube units, the temperature rise requirement is met, and the device loss is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 It is a schematic diagram of an application scenario provided by the embodiments of the present application;

[0047] Figure 2 It is a schematic diagram of the structure of a conversion circuit provided by the embodiments of the present application;

[0048] Figure 3 It is a schematic diagram of the full-bridge topology structure provided by the embodiments of the present application;

[0049] Figure 4 It is a schematic diagram of the half-bridge topology structure provided by the embodiments of the present application;

[0050] Figure 5 It is a schematic diagram of the structure of a conversion circuit provided by the embodiments of the present application;

[0051] Figure 6 It is a schematic diagram of the scenario of switching tube unit control provided by the embodiments of the present application;

[0052] Figure 7 It is a schematic diagram of the structure of a charging pile system provided by the embodiments of the present application;

[0053] Figure 8 It is a schematic diagram of the structure of another charging pile system provided by the embodiments of the present application.

[0054] Through the above drawings, the clear embodiments of the present application have been shown, and there will be more detailed descriptions later. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0056] First, the terms related to the embodiments of the present application will be explained.

[0057] Pulse-width modulation (PWM for short): Adjust the width of the pulse to control the output voltage or current.

[0058] Phase Frequency Modulation (PFM for short): Adjust the frequency of the pulse to control the output voltage or current.

[0059] For ease of understanding, the following will be combined with Figure 1 to illustrate the application scenarios related to the embodiments of the present application.

[0060] Figure 1 is a schematic diagram of an application scenario provided by the embodiments of the present application. Please refer to Figure 1 The resonant conversion circuit (LLC resonant conversion circuit) may include a switch module, a resonant module, a voltage conversion module, and a rectification module connected in sequence. The switch module is used to convert the input DC voltage into a high-frequency square wave; then the square wave enters the resonant module, and the resonant module eliminates the harmonics of the square wave and outputs a sine wave of the fundamental frequency; the voltage conversion module steps up or steps down the sine wave voltage according to the application requirements; finally, the rectification module converts the sine wave into a stable DC output.

[0061] The LLC resonant conversion circuit is often used in the charging module to convert the initial power supply voltage to supply power to the electrical equipment. In actual applications, in the constant power output scenario, the target output voltages required by different models of electrical equipment may vary greatly, and the voltage output range of a single LLC resonant conversion circuit has certain limitations and is difficult to meet the constant power output requirements for a wide voltage range, resulting in poor adaptability.

[0062] The embodiments of the present application provide a conversion circuit 100. The following will be combined with Figure 2 to illustrate the structure of the conversion circuit 100 provided by the embodiments of the present application.

[0063] Figure 2Schematic diagram of a conversion circuit 100 provided by an embodiment of the present application. The conversion circuit 100 can be used for constant power output. As Figure 2 shown, the conversion circuit 100 includes a resonant conversion circuit 10; the resonant conversion circuit 10 includes a first switching module 11 and a switching module 12, a resonant module 13, a voltage conversion module 14, and a rectification module 15 connected in sequence; wherein,

[0064] The switching module 12 includes four switching tube units;

[0065] The first switching module 11 is connected to the four switching tube units and is used to switch the four switching tube units to a full-bridge topology or a half-bridge topology; wherein, in the full-bridge topology, the first switching tube unit Q1 and the second switching tube unit Q2 are connected in series, and the third switching tube unit Q3 and the fourth switching tube unit Q4 are connected in series; in the half-bridge topology, the first switching tube unit Q1 and the third switching tube unit Q3 are connected in parallel, and the second switching tube unit Q2 and the fourth switching tube unit Q4 are connected in parallel.

[0066] In a specific implementation, the switching module 12 is provided with a first switching tube unit Q1, a second switching tube unit Q2, a third switching tube unit Q3, and a fourth switching tube unit Q4. The first switching module 11 is connected to the first switching tube unit Q1, the second switching tube unit Q2, the third switching tube unit Q3, and the fourth switching tube unit Q4, and by changing the connection relationship between the first switching tube unit Q1, the second switching tube unit Q2, the third switching tube unit Q3, and the fourth switching tube unit Q4, the switching module 12 is switched to a full-bridge topology or a half-bridge topology. Wherein, in the full-bridge topology, the first switching tube unit Q1 and the second switching tube unit Q2 are connected in series, and the third switching tube unit Q3 and the fourth switching tube unit Q4 are connected in series; in the half-bridge topology, the first switching tube unit Q1 and the third switching tube unit Q3 are connected in parallel, and the second switching tube unit Q2 and the fourth switching tube unit Q4 are connected in parallel.

[0067] The main difference between these two topologies is that the square wave generated by the full-bridge topology has no DC offset and the amplitude is equal to the input voltage (VIN); the half-bridge topology generates a square wave with an offset (VIN / 2). Therefore, in the case of the same input voltage, the amplitude of the square wave output by the half-bridge topology is only half of the amplitude of the square wave output by the full-bridge topology.

[0068] Therefore, in the scenario of constant power output, when the target output voltage of the resonant conversion circuit is relatively large, the switching module can adopt a full-bridge topology structure; when the target output voltage of the resonant conversion circuit is relatively small, the switching module can adopt a half-bridge topology structure. At the same time, due to the parallel connection of the switching transistor unit Q1 and the third switching transistor unit Q3, and the parallel connection of the second switching transistor unit Q2 and the fourth switching transistor unit Q4 under the half-bridge topology structure, the loss of the switching transistors in the switching module can be reduced under high-frequency and high-current conditions, thereby reducing the temperature rise and stress risk of the switching transistors during low-voltage output.

[0069] In some examples, under the full-bridge topology structure, the first bridge arm of the switching module 12 includes a series connection of a first switching transistor unit Q1 and a second switching transistor unit Q2, and the second bridge arm of the switching module 12 includes a series connection of a third switching transistor unit Q3 and a fourth switching transistor unit Q4; under the half-bridge topology structure, the upper bridge arm of the switching module 12 includes a parallel connection of a first switching transistor unit Q1 and a third switching transistor unit Q3, and the lower bridge arm of the switching module 12 includes a parallel connection of a second switching transistor unit Q2 and a fourth switching transistor unit Q4.

[0070] Figure 3 Schematic diagram of the full-bridge topology structure provided by the embodiment of the present application. As Figure 3 shown, under the full-bridge topology structure, the first end of the first switching transistor unit Q1 and the first end of the third switching transistor unit Q3 are connected to one end of the input voltage, the second end of the first switching transistor unit Q1 and the first end of the second switching transistor unit Q2 are connected to the resonant module 13, the second end of the third switching transistor unit Q3 and the first end of the fourth switching transistor unit Q4 are connected to the resonant module 13, and the second end of the second switching transistor unit Q2 and the second end of the fourth switching transistor unit Q4 are connected to the other end of the input voltage.

[0071] Figure 4 Schematic diagram of the half-bridge topology structure provided by the embodiment of the present application. As Figure 4 shown, under the half-bridge topology structure, the first end of the first switching transistor unit Q1 and the first end of the third switching transistor unit Q3 are connected to one end of the input voltage, the second end of the first switching transistor unit Q1, the second end of the third switching transistor unit Q3, the first end of the second switching transistor unit Q2, and the first end of the fourth switching transistor unit Q4 are connected to the resonant module 13, and the second end of the second switching transistor unit Q2 and the second end of the fourth switching transistor unit Q4 are connected to the other end of the input voltage. Since the first switching transistor unit Q1 and the third switching transistor unit Q3 are in parallel, and the second switching transistor unit Q2 and the fourth switching transistor unit Q4 are in parallel, it can support the flow of large current during low-voltage output, meet the current-carrying capacity, and meet the temperature-rise requirements.

[0072] As Figure 2 shown, in some examples, the first switching module 11 includes: a first switch S1, a second switch S2, and a third switch S3; wherein,

[0073] The first moving end of the first switch S1 is connected to the first end of the fourth switching transistor unit Q4, the second moving end of the first switch S1 is connected to the second end of the fourth switching transistor unit Q4, and the common end of the first switch S1 is connected to the second input end of the resonance module 13;

[0074] One end of the second switch S2 is connected to the second end of the first switching transistor unit Q1, and the other end of the second switch S2 is connected to the second end of the third switching transistor unit Q3;

[0075] One end of the third switch S3 is connected to the first end of the second switching transistor unit Q2, and the other end of the third switch S3 is connected to the first end of the fourth switching transistor unit Q4;

[0076] When the first moving end and the common end of the first switch S1 are turned on and the second switch S2 and the third switch S3 are turned off, the four switching transistor units form a full-bridge topology;

[0077] When the second moving end and the common end of the first switch S1 are turned on and the second switch S2 and the third switch S3 are turned on, the four switching transistor units form a half-bridge topology.

[0078] It should be noted that Figure 1 Only one switching transistor in the switching transistor unit is taken as an example for illustration. In practical applications, the switching transistor unit may include one switching transistor or multiple parallel-connected switching transistors.

[0079] Exemplarily, the switching transistor may be a metal-oxide-semiconductor field-effect transistor (MOSFET), or may be a bipolar junction transistor (BJT), an insulated-gate bipolar transistor (IGBT), a high electron mobility transistor (HEMT), etc., which are not limited herein.

[0080] Taking the switching transistor as a P-channel enhancement-mode field-effect transistor as an example, the first end of the switching transistor may be the drain of the switching transistor, the first end of the switching transistor may be the source of the switching transistor, and the switching transistor is turned on or off according to the control signal received by the gate.

[0081] The conversion circuit provided in this embodiment, by setting the first switching module, can switch the switching module to the full-bridge topology when the high voltage is output, and can switch the switching module to the half-bridge topology when the low voltage is output, so that the conversion circuit can achieve a double voltage gain in the range near the resonance frequency, thereby realizing a wide-range and high-efficiency constant-power voltage output, effectively broadening the low-voltage constant-power voltage range; and, when the low voltage is output, the on-current capacity is satisfied by the parallel-connected switching transistor units, the temperature rise requirement is met, and the device loss is reduced.

[0082] When the conversion circuit 100 includes a plurality of resonant conversion circuits 10, the connection relationship of the plurality of resonant conversion circuits 10 can also be changed to further expand the voltage output range.

[0083] In a possible implementation, the number of the resonant conversion circuits 10 is plural, and the conversion circuit 100 further includes: a plurality of second switching modules 20, which are connected to the plurality of resonant conversion circuits 10 and are configured to switch the plurality of resonant conversion circuits 10 to a parallel mode or a series mode.

[0084] In a specific implementation, when the conversion circuit 100 outputs a low voltage, by setting the plurality of resonant conversion circuits 10 to the parallel mode, the plurality of resonant conversion circuits 10 are input in parallel and output in parallel, which can effectively reduce the current in each resonant conversion circuit 10 and avoid losses to the devices; when the conversion circuit 100 outputs a high voltage, the plurality of resonant conversion circuits 10 can be set to the series mode, so that the plurality of resonant conversion circuits 10 are input in parallel and output in series, realizing the sharing of the output voltage, and thus a high voltage can be reliably output.

[0085] Figure 5 This is a schematic structural diagram of another conversion circuit 100 provided by the embodiments of the present application. As Figure 5 shown, in some examples, the second switching module 20 includes: a fourth switch S4, a fifth switch S5, and a sixth switch S6;

[0086] The first output terminal of the first resonant conversion circuit 10a is connected to the first input terminal of the load, the second output terminal of the first resonant conversion circuit 10a is connected to one end of the fourth switch S4 and one end of the fifth switch S5, and the other end of the fifth switch S5 is connected to the second input terminal of the load;

[0087] The first input terminal of the second resonant conversion circuit 10b is connected to the other end of the fourth switch S4 and one end of the sixth switch S6, the second output terminal of the second resonant conversion circuit 10b is connected to the second input terminal of the load, and the other end of the sixth switch S6 is connected to the first input terminal of the load;

[0088] In the parallel mode, the fourth switch S4 is turned off, and the fifth switch S5 and the sixth switch S6 are turned on;

[0089] In the series mode, the fourth switch S4 is turned on, and the fifth switch S5 and the sixth switch S6 are turned off.

[0090] In a specific implementation, when the number of the resonant conversion circuits 10 is N, the number of the second switching modules 20 is N - 1. One second switching module is correspondingly arranged for every two adjacent resonant conversion circuits. The connection relationship of the two adjacent resonant conversion circuits can be changed through the second switching module, so as to achieve the purpose of switching multiple resonant conversion circuits into a parallel mode or a series mode.

[0091] The following takes the conversion circuit 100 including two resonant conversion circuits 10 as an example for illustration. The two resonant conversion circuits are respectively a first resonant conversion circuit 10a and a second resonant conversion circuit 10b. Wherein, a first output end of the first resonant conversion circuit 10a is connected to a first input end of the load, a second output end of the second resonant conversion circuit 10b is connected to a second input end of the load, a fourth switch S4 is arranged between a second output end of the first resonant conversion circuit 10a and a first output end of the second resonant conversion circuit 10b, a fifth switch S5 is arranged between a second output end of the first resonant conversion circuit 10a and a second input end of the load, and a sixth switch S6 is arranged between a first output end of the second resonant conversion circuit 10b and a first input end of the load.

[0092] In the parallel mode, the fourth switch S4 is turned off, and the fifth switch S5 and the sixth switch S6 are turned on. Therefore, the first output ends of the first resonant conversion circuit 10a and the second resonant conversion circuit 10b are respectively connected to the first input end of the load, and the first resonant conversion circuit 10a and the second resonant conversion circuit 10b are respectively connected to the second input end of the load, so as to realize that the first resonant conversion circuit 10a and the second resonant conversion circuit 10b are input-parallel and output-parallel; in the series mode, the fourth switch S4 is turned on, and the fifth switch S5 and the sixth switch S6 are turned off. The first output end of the first resonant conversion circuit 10a is connected to the first output end of the load, the second output end of the first resonant conversion circuit 10a is connected to the first output end of the second resonant conversion circuit 10b, and the second output end of the second resonant conversion circuit 10b is connected to the second output end of the load, so as to realize that the first resonant conversion circuit 10a and the second resonant conversion circuit 10b are input-parallel and output-series.

[0093] It should be noted that Figure 5 only two resonant conversion circuits 10 are taken as an example for illustration. In practical applications, the number of the resonant conversion circuits 10 can be flexibly selected according to production needs, and the connection relationship between the second switching module 20 and the resonant conversion circuit 10 can be analogized. Assuming that the number of the resonant conversion circuits 10 is N, wherein,

[0094] the first output end and the second output end of each resonant conversion circuit 10 are respectively used for connecting to the first input end and the second input end of the load;

[0095] For the first to the (N - 1)th resonant conversion circuits 10, a fourth switch S4 is provided between the second output terminal of each resonant conversion circuit 10 and the first input terminal of the next resonant conversion circuit 10, and a fifth switch S5 is provided between the second output terminal of each resonant conversion circuit 10 and the second input terminal of the load.

[0096] For the second to the Nth resonant conversion circuits 10, a sixth switch S6 is provided between the first output terminal of each resonant conversion circuit 10 and the first input terminal of the load.

[0097] The conversion circuit provided in this embodiment can switch multiple resonant conversion circuits 10 to a parallel or series mode through the second switching module, so as to further expand the voltage output range and improve the flexibility and adaptability of the conversion circuit.

[0098] Based on the above embodiment, by changing the topological structure of the switch module 12 and the connection relationship of multiple resonant conversion circuits 10, various voltage output requirements can be flexibly adapted.

[0099] In a possible implementation manner, when the target output voltage value of the conversion circuit 100 is greater than the first threshold, the first switching module 11 is used to switch the four switch tube units to a full-bridge topological structure; the second switching module 20 is used to switch multiple resonant conversion circuits 10 to a series mode.

[0100] When the target output voltage value of the conversion circuit 100 is not greater than the first threshold and greater than the second threshold, the first switching module 11 is used to switch the four switch tube units to a half-bridge topological structure; the second switching module 20 is used to switch multiple resonant conversion circuits 10 to a series mode.

[0101] When the target output voltage value of the conversion circuit 100 is not greater than the second threshold and greater than the third threshold, the first switching module 11 is used to switch the four switch tube units to a full-bridge topological structure; the second switching module 20 is used to switch multiple resonant conversion circuits 10 to a parallel mode.

[0102] When the target output voltage value of the conversion circuit 100 is not greater than the third threshold, the first switching module 11 is used to switch the four switch tube units to a half-bridge topological structure; the second switching module 20 is used to switch multiple resonant conversion circuits 10 to a parallel mode.

[0103] For example, assume that the first threshold is 750V, the second threshold is 500V, and the third threshold is 300V; when the target output voltage value ≤ 300V, the first switching module 11 switches the four switching tube units to a half-bridge topology, the second switching module 20 switches the multiple resonant conversion circuits 10 to a parallel mode, and the conversion circuit 100 is in a medium-low gain; when 300V < target output voltage value ≤ 500V, the first switching module 11 switches the four switching tube units to a full-bridge topology, the second switching module 20 switches the multiple resonant conversion circuits 10 to a parallel mode, and the conversion circuit 100 is in a medium-high gain; when 500V < target output voltage value ≤ 750V, the first switching module 11 switches the four switching tube units to a half-bridge topology, the second switching module 20 switches the multiple resonant conversion circuits 10 to a series mode, and the conversion circuit 100 is in a medium-low gain; when 750V < target output voltage value ≤ 1000V, the first switching module 11 switches the four switching tube units to a full-bridge topology, the second switching module 20 switches the multiple resonant conversion circuits 10 to a series mode, and the conversion circuit 100 is in a medium-high gain.

[0104] The conversion circuit provided in this embodiment can change the voltage gain by using four circuit modes, enabling the conversion circuit to operate in an efficient region, so that it can flexibly adapt to four voltage output requirements, effectively achieve constant power output while protecting the devices.

[0105] Figure 6 It is a schematic diagram of the scenario of the switching tube unit control provided by the embodiment of this application. As Figure 6 shown, in a possible implementation, when the target output voltage value of the conversion circuit 100 is greater than the fourth threshold, the four switching tube units receive a pulse frequency modulation signal;

[0106] When the target output voltage value of the conversion circuit 100 is not greater than the fourth threshold, the four switching tube units receive a pulse width modulation signal; the fourth threshold is less than the third threshold.

[0107] In a specific implementation, when the output voltage of the conversion circuit 10 is extremely low, a PWM signal can be used to control the switching tube units in the switching module 12, effectively optimizing the operating frequency, reducing the deviation from the resonant point, and thus reducing the loss of the switching tube units. When the output voltage of the conversion circuit 10 is not extremely low, a PFM signal can be used to control the switching tube units in the switching module 12, effectively improving the efficiency.

[0108] For example, assume that the fourth threshold is 0V. When the target output voltage value ≤ 0V, the conversion circuit 100 is in low gain, and the four switching transistor units receive a half-bridge PWM signal (FB PWM); when 0V < target output voltage value ≤ 300V or 500V < target output voltage value ≤ 750V, the conversion circuit 100 is in medium-low gain, and the four switching transistor units receive a half-bridge PFM signal (HBPFM); when 300V < target output voltage value ≤ 500V or 750V < target output voltage value ≤ 1000V, the conversion circuit 100 is in medium-high gain, and the four switching transistor units receive a full-bridge PFM signal (FB PFM).

[0109] In some examples, when the target output voltage value of the conversion circuit 100 is not greater than the fifth threshold, the four switching transistor units operate in a hiccup (BURST) mode; the fifth threshold is less than the fourth threshold.

[0110] In a specific implementation, when the load is extremely light, the target output voltage value of the conversion circuit 100 is extremely small, the target output voltage value is not greater than the fifth threshold, and the gain of the conversion circuit 100 is very low. Therefore, the four switching transistor units can be controlled by a BURST PWM signal. Under BURST control, the output voltage of the switching module 12 is converted from a continuous mode to a discontinuous mode, reducing the equivalent input voltage of the resonant module, thereby reducing the output voltage and improving the efficiency and dynamic response of the system.

[0111] The conversion circuit provided in this embodiment can use different switching transistor control modes based on different target voltage output values, can effectively optimize the operating frequency, enable the conversion circuit 100 to operate in an effective region, and achieve constant power output in a wide voltage range, especially at a lower voltage.

[0112] The embodiment of the present application also provides a charging module, and the charging module includes the conversion circuit as described above.

[0113] The charging module can output the target output voltage required by the electrical device. Exemplarily, when the electrical device uses a DC power supply, the charging module may further include an AC-DC conversion circuit for converting an AC voltage into a DC voltage; the conversion circuit is connected to the AC-DC conversion circuit for converting the DC voltage into the target output voltage, so that the electrical device can be powered by a DC power supply with the magnitude of the target output voltage.

[0114] The embodiment of the present application also provides a charging device, and the charging device includes the charging module as described above. Based on the charging module, the charging device can output the target output voltage for the electrical device.

[0115] In some embodiments, the electrical device may be a vehicle, and correspondingly, the charging device may be a charging host.

[0116] Figure 7 The structural schematic diagram of the charging pile system provided by the embodiment of the present application. As Figure 7 shown, the charging pile system includes a charging host and a plurality of charging piles. The charging host is electrically connected to the charging piles, and the charging host can provide charging power for the charging piles.

[0117] Among them, the charging host includes a charging control module and a plurality of charging modules. The charging control module is used to control whether the charging piles are connected to the charging modules, and the charging modules are used to output a target output voltage to the charging piles, so that the charging piles can use the target output voltage to charge the vehicle. The charging pile may include a charging gun, and the charging pile is connected to the vehicle through the charging gun.

[0118] It can be understood that in this embodiment, the charging host is independent of the charging pile and is arranged outside the charging terminal, so as to realize the centralized management and control of charging, which can effectively reduce the volume of the charging pile and facilitate the layout and installation of the charging pile. In other embodiments, the charging host can also be integrated inside the charging pile. Figure 8 The structural schematic diagram of another charging pile system provided by the embodiment of the present application. As Figure 8 shown, the charging host can control and manage the charging process of the charging pile where it is located.

[0119] The charging device provided by the embodiment of the present application can achieve wide-range constant power voltage output, can meet the charging requirements of various models of vehicles, and flexibly and reliably output the required target output voltage for the vehicle.

[0120] In other embodiments, the electrical device can also be a server. Correspondingly, the charging device can be a power supply device for the server. The charging device converts the AC power into DC power, the voltage of the DC power is the target output voltage, and the DC power is used to supply power to the server so that the server can operate safely and reliably.

[0121] The embodiment of the present application also provides a conversion circuit control method, which is applied to a conversion circuit; the conversion circuit includes a resonant conversion circuit, and the resonant conversion circuit includes a switch module, a resonant module, a voltage transformation module, and a rectification module connected in sequence; the switch module includes four switch tube units; the method includes:

[0122] Switch the four switch tube units to a full-bridge topology or a half-bridge topology; among them, in the full-bridge topology, the first switch tube unit and the second switch tube unit are connected in series, and the third switch tube unit and the fourth switch tube unit are connected in series; in the half-bridge topology, the first switch tube unit and the third switch tube unit are connected in parallel, and the second switch tube unit and the fourth switch tube unit are connected in parallel.

[0123] In a possible implementation, the number of resonant conversion circuits may be multiple, and the method further includes: switching the multiple resonant conversion circuits to a parallel mode or a series mode.

[0124] An embodiment of the present application further provides a conversion device, including the conversion circuit and a control chip as described above;

[0125] The control chip is configured to execute the method as described above.

[0126] In a specific implementation, the control chip may determine the topology of the switch module and the connection relationship of the multiple resonant conversion circuits according to the target output voltage of the conversion circuit, and output control signals to the control unit and the control module, so as to control the first switching module to switch the four switch tube units to a full-bridge topology or a half-bridge topology, and control the second switching module to switch the multiple resonant conversion circuits to a series mode or a parallel mode.

[0127] An embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by the control chip, they can be used to execute the conversion circuit control method shown in the above method embodiment. The implementation principle and technical effects are similar and will not be elaborated here.

[0128] All or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a readable memory. When the program is executed, it executes the steps including the above method embodiments; and the foregoing memory (storage medium) includes: read-only memory (abbreviation: ROM), RAM, flash memory, hard disk, solid state drive, magnetic tape, floppy disk, optical disc, and any combination thereof.

[0129] Embodiments of the present application are described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processing unit of a general-purpose computer, a special-purpose computer, an embedded processing machine, or other programmable terminal devices to generate a machine, so that the instructions executed by the processing unit of the computer or other programmable terminal devices generate a device for realizing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0130] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable terminal device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction device that implements the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 specified in one block or multiple blocks.

[0131] These computer program instructions can also be loaded onto a computer or other programmable terminal device, such that a series of operational steps are performed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 specified in one block or multiple blocks.

[0132] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalent technologies, the embodiments of the present application are also intended to include these modifications and variations.

[0133] In the embodiments of the present application, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the presence of additional identical elements in the process, method, article or device including such element. The term "or" and its variants may refer to "and / or". In the embodiments of the present application, terms such as "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. In the embodiments of the present application, "a plurality of" means two or more. "And / or" describes the associated relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0134] Other embodiments of the present application will be readily conceived by those skilled in the art after considering the specification and the invention disclosed in practice. The embodiments of the present application are intended to cover any variations, uses, or adaptations of the embodiments of the present application, which follow the general principles of the embodiments of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the embodiments of the present application.

Claims

1. A transformation circuit, characterized in that, Comprising: A resonant conversion circuit; the resonant conversion circuit includes a first switching module and a switching module, a resonant module, a voltage conversion module, and a rectification module connected in sequence; wherein, The switching module includes four switching tube units; The first switching module is connected to the four switching tube units, and the first switching module is used to switch the four switching tube units into a full-bridge topology or a half-bridge topology; wherein, in the full-bridge topology, the first switching tube unit and the second switching tube unit are connected in series, and the third switching tube unit and the fourth switching tube unit are connected in series; in the half-bridge topology, the first switching tube unit and the third switching tube unit are connected in parallel, and the second switching tube unit and the fourth switching tube unit are connected in parallel.

2. The circuit according to claim 1, wherein The first switching module includes: a first switch, a second switch, and a third switch; wherein, The first throw end of the first switch is connected to the first end of the fourth switching tube unit, the second throw end of the first switch is connected to the second end of the fourth switching tube unit, and the common end of the first switch is connected to the second input end of the resonant module; One end of the second switch is connected to the second end of the first switching tube unit, and the other end of the second switch is connected to the second end of the third switching tube unit; One end of the third switch is connected to the first end of the second switching tube unit, and the other end of the third switch is connected to the first end of the fourth switching tube unit; When the first throw end and the common end of the first switch are conducting, and the second switch and the third switch are off, the four switching tube units form a full-bridge topology; When the second throw end and the common end of the first switch are conducting, and the second switch and the third switch are conducting, the four switching tube units form a half-bridge topology.

3. The circuit according to claim 1 or 2, characterized in that, The number of the resonant conversion circuits is multiple, and the circuit further includes: a plurality of second switching modules, the plurality of second switching modules are connected to the plurality of resonant conversion circuits, and are used to switch the plurality of resonant conversion circuits into a parallel mode or a series mode.

4. The circuit according to claim 3, characterized in that, The second switching module includes: a fourth switch, a fifth switch, and a sixth switch; the resonant conversion circuit includes a first resonant conversion circuit and a second resonant conversion circuit; The first output end of the first resonant conversion circuit is used to be connected to the first input end of the load, the second output end of the first resonant conversion circuit, one end of the fourth switch, and one end of the fifth switch are connected, and the other end of the fifth switch is used to be connected to the second input end of the load; The first input end of the second resonant conversion circuit, the other end of the fourth switch, and one end of the sixth switch are connected, the second output end of the second resonant conversion circuit is used to be connected to the second input end of the load, and the other end of the sixth switch is used to be connected to the first input end of the load; In the parallel mode, the fourth switch is off, and the fifth switch and the sixth switch are conducting; In the series mode, the fourth switch is conducting, and the fifth switch and the sixth switch are off.

5. The circuit according to claim 3, wherein When the target output voltage value of the conversion circuit is greater than the first threshold, the first switching module is configured to switch the four switching tube units to a full-bridge topology; the second switching module is configured to switch the plurality of resonant conversion circuits to a series mode; When the target output voltage value of the conversion circuit is not greater than the first threshold and greater than the second threshold, the first switching module is configured to switch the four switching tube units to a half-bridge topology; the second switching module is configured to switch the plurality of resonant conversion circuits to a series mode; When the target output voltage value of the conversion circuit is not greater than the second threshold and greater than the third threshold, the first switching module is configured to switch the four switching tube units to a full-bridge topology; the second switching module is configured to switch the plurality of resonant conversion circuits to a parallel mode; When the target output voltage value of the conversion circuit is not greater than the third threshold, the first switching module is configured to switch the four switching tube units to a half-bridge topology; the second switching module is configured to switch the plurality of resonant conversion circuits to a parallel mode.

6. The circuit according to claim 5, characterized in that, When the target output voltage value of the conversion circuit is not greater than the third threshold and greater than the fourth threshold, the four switching tube units receive a pulse frequency modulation signal; When the target output voltage value of the conversion circuit is not greater than the fourth threshold, the four switching tube units receive a pulse width modulation signal.

7. The circuit according to claim 6, wherein When the target output voltage value of the conversion circuit is not greater than the fifth threshold, the four switching tube units operate in a hiccup mode; the fifth threshold is less than the fourth threshold.

8. The circuit according to any one of claims 3-7, characterized in that, The number of the second switching modules is one more than the number of the resonant conversion circuits.

9. A charging module, characterized in that, Comprising the conversion circuit according to any one of claims 1-8.

10. A charging device, characterized in that, Comprising the charging module according to claim 9.

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