Charging control circuit, charging device and charging method

Abstract

The embodiment of the invention discloses a charging control circuit, a charging device and a charging method, the charging control circuit comprises an output module, a first rectification module, a second rectification module, a first switch, a second switch and a control module, and the output module is provided with a first input end and a first output end; the first rectifier module is connected with the first input end; the second rectifier module is connected in series with the first rectifier module and is connected with the first input end; the first switch is connected in series between the first rectifier module and the first input end; the second switch is connected in series between the second rectifier module and the first input end; the control module is connected with the output module, the first switch and the second switch. By controlling the on-off of the first switch and the second switch, the voltage value of the first input end can be adjusted, so that the voltage value of the first input end is closer to the voltage value of the first output end, the absolute value of the voltage difference between the first input end and the first output end is reduced, and the conversion efficiency of the output module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging equipment, in particular to a charging control circuit, a charging device and a charging method. BACKGROUND

[0002] In the related art, a charger has a transformer and a direct current conversion circuit. The transformer rectifies alternating current into direct current, and the direct current conversion circuit further converts the voltage output by the transformer into a voltage of more gears, thereby meeting the use demand.

[0003] However, when the direct current conversion circuit needs to output a higher or lower voltage, the difference between the input voltage value and the output voltage value of the direct current conversion circuit is relatively large, thereby causing the conversion efficiency of the direct current conversion circuit to be low. SUMMARY

[0004] The embodiments of the present application provide a charging control circuit, a charging device and a charging method, which can improve the efficiency of direct current conversion.

[0005] In a first aspect, the embodiments of the present application provide a charging control circuit, comprising an output module, a first rectification module, a second rectification module, a first switch, a second switch and a control module. The output module has a first input end and a first output end. The first output end is used to be connected with an external load. The output module can adjust the output voltage value of the first output end according to the expected voltage value of the external load. The first rectification module is connected with the first input end. The second rectification module is connected with the first rectification module in series and is connected with the first input end. The first switch is connected between the first rectification module and the first input end. The second switch is connected between the second rectification module and the first input end. The control module is connected with the output module, the first switch and the second switch. The control module controls the on-off of the first switch and the second switch according to the expected current value and the expected voltage value of the external load.

[0006] Based on the above-mentioned embodiments, when the second rectification module powers the output module alone, the voltage of the first input end is relatively low. When the first rectification module and the second rectification module are connected in series to power the output module together, the voltage of the first input end is relatively high. The control module controls the on-off of the first switch and the second switch, thereby adjusting the voltage value of the first input end, so that the voltage value of the first input end is closer to the voltage value of the first output end, thereby reducing the absolute value of the voltage difference between the first input end and the first output end, and further improving the conversion efficiency of the output module.

[0007] In a second aspect, the embodiments of the present application provide a charging device, comprising a housing, a circuit board and a charging control circuit, the circuit board is arranged in the housing, and the charging control circuit is arranged on the circuit board.

[0008] In a third aspect, the embodiments of the present application provide a charging method, which is applied to a charging device, and the charging method comprises the following steps.

[0009] obtaining a desired voltage value and a desired current value of the external load, and calculating a desired power value;

[0010] if the desired power value of the external load is greater than the maximum output power value of the second rectifier module, closing the first switch and opening the second switch;

[0011] adjusting the output voltage values of the first rectifier module and the second rectifier module, so that the absolute value of the difference between the input voltage value of the first input end and the output voltage value of the first output end reaches a minimum.

[0012] Based on the above embodiments, by adjusting the output voltage values of the first rectifier module and the second rectifier module, the difference between the input voltage value of the first input end and the output voltage value of the first output end is reduced, so that the conversion efficiency of the output module is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0014] Figure 1 FIG. 1 is a structural schematic diagram of a charging device in an embodiment of the present application;

[0015] Figure 2 FIG. 2 is a block schematic diagram of a charging control circuit in an embodiment of the present application;

[0016] Figure 3 FIG. 3 is a circuit schematic diagram of the charging control circuit in an embodiment of the present application;

[0017] Figure 4 FIG. 4 is a circuit schematic diagram of the charging control circuit in another embodiment of the present application;

[0018] Figure 5 FIG. 5 is a circuit schematic diagram of the charging control circuit in another embodiment of the present application;

[0019] Figure 6 FIG. 6 is a circuit schematic diagram of a rectifier module with flyback architecture.

[0020] Figure 7 A circuit schematic diagram of a rectifier module with LLC architecture;

[0021] Figure 8 A circuit schematic diagram of a rectifier module with AHB architecture;

[0022] Figure 9 A circuit schematic diagram of a charging control circuit in another embodiment of the present application;

[0023] Figure 10 A block schematic diagram of a charging control circuit in another embodiment of the present application;

[0024] Figure 11 A flow schematic diagram of a charging method in an embodiment of the present application;

[0025] Figure 12 A flow schematic diagram of a charging method in another embodiment of the present application.

[0026] Label explanation: 10, charging device; 100, charging control circuit; 110, output module; 111, first input end; 120, first rectifier module; 121, first transformer; 122, first rectifying element; 130, second rectifier module; 131, second transformer; 132, second rectifying element; 140, first switch; 150, second switch; 160, control module; 170, third switch; C1, first capacitor; C2, second capacitor; C3, third capacitor; 180, third rectifier module; 190, fourth switch; 200, shell. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0028] As shown in Figures 1-2 , the first aspect of the embodiment of the present application provides a charging device 10, which is used in the field of consumer electronics. The charging device 10 can be exemplarily a charging head, an adapter, etc. The charging power of the charging device 10 can be exemplarily 65W, 90W, 100W, 120W, 150W, 180W, 240W, etc.

[0029] The charging device 10 includes a shell 200, a circuit board (not shown in the figure) and a charging control circuit 100.

[0030] The material of the shell 200 can be plastic or metal. Specifically, the material of the shell 200 can be plastic, so that the shell 200 is insulated, thereby reducing the risk of electric shock for the user, and because the plastic material is lighter in quality, the shell 200 is lighter in quality, thereby making the overall quality of the charging device 10 lighter, so as to facilitate carrying. Specifically, the shell 200 can be integrally injection molded, so that the shell 200 has higher structural strength, thereby making the shell 200 not easy to be damaged, being able to protect other components in the shell 200, so as to reduce the probability of damage of other components, thereby making the charging device 10 have a longer service life.

[0031] The circuit board is arranged in the shell 200, and the charging control circuit 100 can be formed on the circuit board through an etching process, thereby improving the manufacturing efficiency of the charging control circuit 100, and further reducing the manufacturing cost of the charging control circuit 100.

[0032] The second aspect of the embodiment of the application provides a charging control circuit 100. The charging control circuit 100 converts alternating current into direct current through an AC / DC converter (alternating current to direct current converter), and outputs the direct current to a DC / DC converter (direct current to direct current converter), and then the DC / DC converter converts the direct current into a voltage required by an external load, thereby adapting to various external loads. In particular, the embodiment of the application includes two AC / DC converters, and can realize two output modes of single AC / DC converter output or two AC / DC converters in series output. According to the output voltage value of the DC / DC converter, one of the output modes is selected for output, so as to change the input voltage value of the DC / DC converter, so that the difference between the input voltage value and the output voltage value of the DC / DC converter is as small as possible, and the conversion efficiency of the DC / DC converter is improved.

[0033] The charging control circuit 100 will be described in detail below. As shown in Figures 2-5 The charging control circuit 100 includes an output module 110, a first rectification module 120, a second rectification module 130, a first switch 140, a second switch 150, and a control module 160.

[0034] The output module 110 has a first input end 111 and a first output end. The first output end is used to be connected with an external load. The external load includes but is not limited to a mobile phone, a tablet computer, a notebook computer, and a smart watch. The output module 110 can adjust the output voltage of the first output end according to the expected voltage of the external load. Generally, the output voltage of the first output end meets the expected voltage of the external load as much as possible. If the output voltage of the first output end cannot meet the expected voltage of the external load, the first output end outputs the voltage closest to the expected voltage.

[0035] For example, the output voltage range of the first output end is 5-20V, if the expected voltage of the external load is 5V, the output voltage of the first output end is adjusted to 5V, if the expected voltage of the external load is 15V, the output voltage of the first output end is adjusted to 15V, if the expected voltage of the external load is 20V, the output voltage of the first output end is adjusted to 20V, if the expected voltage of the external load is 30V, the output voltage of the first output end is adjusted to 20V. It should be noted that if the expected voltage of the external load is 3V, and the minimum voltage that the first output end can output is 5V, in order to avoid damage to the external load, the output voltage of the first output end can be adjusted to 0V, that is, no output.

[0036] The smaller the difference between the output voltage value of the first output end and the input voltage value of the first input end 111, the higher the conversion efficiency of the output module 110. For example, the current industry 20V to 5V efficiency level is about 94%, while the 10V to 5V efficiency level is above 96%, and the energy efficiency of 10V to 5V is higher than that of 20V to 5V by more than 2 energy efficiency points.

[0037] The first rectifier module 120 is connected with the first input end 111, and the first rectifier module 120 is used to rectify alternating current power into direct current. The first rectifier module 120 supplies power to the output module 110 through the first output end.

[0038] The second rectifier module 130 is connected with the first input end 111 in series with the first rectifier module 120. The second rectifier module 130 is used to rectify alternating current power into direct current. The second rectifier module 130 can supply power to the output module 110 through the first output end, or the second rectifier module 130 can be connected in series with the first rectifier module 120 to supply power to the output module 110 together. The output parameters of the first rectifier module 120 and the second rectifier module 130 can be the same or different.

[0039] The first switch 140 is connected in series between the first rectifier module 120 and the first input end 111, and the second switch 150 is connected in series between the second rectifier module 130 and the first input end 111. The first switch 140 can be a normally open and normally closed switch, and the first switch 140 can be a MOS tube, a triode, an electric switch, etc. The second switch 150 can be a normally open and normally closed switch, and the second switch 150 can be a MOS tube, a triode, an electric switch, etc. Figure 4 As shown, when the first switch 140 is open and the second switch 150 is closed, the first rectifier module 120 is in an open circuit state, and the second rectifier module 130 supplies power to the output module 110 alone. Figure 5As shown, when the first switch 140 is closed and the second switch 150 is opened, the first rectifier module 120 and the second rectifier module 130 are connected in series to supply power to the output module 110. It should be noted that the first switch 140 and the second switch 150 cannot be closed at the same time, otherwise the total voltage of the first rectifier module 120 and the second rectifier module 130 connected in series is loaded on the second rectifier module 130, which may cause damage to the second rectifier module 130.

[0040] The control module 160 is connected with the output module 110, the first switch 140 and the second switch 150. The control module 160 can communicate with the external load through the output module 110 to obtain the expected voltage and the expected current of the external load, and the product of the expected voltage and the expected current is the expected power. The control module 160 can output the cooperation result of the first rectifier module 120 and the second rectifier module 130 according to the expected power and the expected voltage of the external load and the output specifications of the first rectifier module 120 and the second rectifier module 130, and control the on-off of the first switch 140 and the second switch 150 according to the cooperation result. The output specifications of the first rectifier module 120 and the second rectifier module 130 are fixed parameters, which are the maximum output current and the maximum output voltage of the first rectifier module 120 and the maximum output current and the maximum output voltage of the second rectifier module 130. The cooperation result is that the first rectifier module 120 outputs alone, or the second rectifier module 130 outputs alone, or the first rectifier module 120 and the second rectifier module 130 are connected in series to output together. Alternatively, the charging control circuit 100 of the embodiment has more obvious efficiency improvement when the output power is relatively large, for example, greater than 100W.

[0041] In summary, when the second rectifier module 130 supplies power to the output module 110 alone, the voltage of the first input end 111 is relatively low, and when the first rectifier module 120 and the second rectifier module 130 are connected in series to supply power to the output module 110 together, the voltage of the first input end 111 is relatively high. The control module 160 can adjust the voltage value of the first input end 111 by controlling the on-off of the first switch 140 and the second switch 150, so that the voltage value of the first input end 111 is closer to the voltage value of the first output end, thereby reducing the absolute value of the voltage difference between the first input end 111 and the first output end, and further improving the conversion efficiency of the output module 110.

[0042] Moreover, compared with a single large rectifier module, the charging control circuit 100 of the embodiment has two rectifier modules, i.e., the first rectifier module 120 and the second rectifier module 130. Under the same power, the surface area of the two rectifier modules is larger than that of a single rectifier module, that is, the heat dissipation area can be effectively increased, and the heat dissipation efficiency is improved, so as to reduce the temperature during use as much as possible.

[0043] In addition, the sum of the costs of the first rectifier module 120 and the second rectifier module 130 is lower than the cost of a single large rectifier module, thereby reducing the cost of the charging control circuit 100 .

[0044] Finally, this embodiment splits a single larger rectifier module into a smaller first rectifier module 120 and a second rectifier module 130. The thickness of the first rectifier module 120 and the second rectifier module 130 are both smaller than that of the single larger rectifier module, thereby reducing the thickness of the charging device 10.

[0045] In some embodiments, the output module 110 includes a DC converter and an output interface, the DC converter has a first input terminal 111, and the DC converter can adjust the input voltage of the first input terminal 111 so that the voltage output by the DC converter is adapted to the expected voltage of the external load. Since the voltage of the first input terminal 111 may be higher than the expected voltage, lower than the expected voltage, or equal to the expected voltage, the adjustment can refer to the three adjustment methods of stepping down, stepping up, or bypassing the input voltage of the first input terminal 111. Optionally, the DC converter can implement at least one of the three adjustment methods. For example, the DC converter can only step up, or the DC converter can only step down, or the DC converter can both step up and step down.

[0046] The output interface is connected to the DC converter and control module 160, and has a first output terminal for connecting to an external load. The output interface exemplarily includes at least one of a USB-A interface, a Micro USB interface, a USB Type-C interface, or a Lightning interface.

[0047] It should be noted that the number of DC converters can be one or more, and multiple DC converters are connected in parallel. Each DC converter corresponds to an output interface, so that each output interface can independently adjust the output voltage, so that the charging control circuit 100 can simultaneously connect and adapt to multiple external loads.

[0048] like Figures 6-8 As shown, in some embodiments, the architecture type of the first rectifier module 120 and the architecture type of the second rectifier module 130 can be the same or different. Common architecture types of rectifier modules include Flyback architecture, LLC (resonant converter circuit) architecture, AHB (Asymmerical Half-Bridge) architecture, forward architecture, half-bridge architecture, and full-bridge architecture.

[0049] like Figure 6As shown in the figure, the output range of the flyback architecture is relatively wide. However, at the moment when the switch tube is turned off, the resonant spike generated by the transformer leakage inductance needs to be absorbed by the RCD absorption circuit, which will reduce the conversion efficiency to a certain extent. The switching loss will also reduce the conversion efficiency, making it unsuitable for higher power output. In other words, the maximum output power of the flyback architecture is limited.

[0050] like Figure 7 As shown in Figure 1, the LLC architecture consists of a resonant inductor (L), a magnetizing inductor (L), and a resonant capacitor (C) connected in series, hence the name LLC. The LLC architecture utilizes zero-voltage switching (ZVS) soft-switching technology, offering advantages such as high operating frequency, low losses, high efficiency, and a compact size. This improves charger power density and allows for higher output power. However, the LLC converter is only efficient near the resonant point and is not suitable for applications with a wide input and output voltage range.

[0051] like Figure 8 As shown, the AHB architecture's secondary side uses a single-power device topology, effectively reducing costs. The transformer and resonant capacitor share energy storage, effectively reducing the transformer's size. The AHB architecture's secondary-side rectifier voltage stress is lower than that of a flyback architecture, allowing the use of MOS transistors with lower voltage resistance. This reduces system cost and debugging difficulty, making it particularly suitable for applications requiring high output voltages, such as PD fast charging.

[0052] In some embodiments, the architecture type of the first rectifier module 120 is one of a flyback architecture, an LLC architecture, an AHB architecture, a forward architecture, a half-bridge architecture, and a full-bridge architecture, or a combination of the above architectures connected in series. The architecture type of the second rectifier module 130 is one of a flyback architecture, an LLC architecture, an AHB architecture, a forward architecture, a half-bridge architecture, and a full-bridge architecture, or a combination of the above architectures connected in series. Optionally, the architecture type of the first rectifier module 120 is different from the architecture type of the second rectifier module 130. By combining the two architectures, the charging control circuit 100 can have the advantages of both architectures.

[0053] For example, the architecture type of the second rectifier module 130 is an LLC architecture, and the second rectifier module 130 is mainly responsible for high-efficiency output. The first rectifier module 120 is a flyback architecture, and the first rectifier module 120 is mainly responsible for regulating the output voltage, so that the charging control circuit 100 has both high efficiency and a wider output voltage.

[0054] like Figure 3As shown, in some embodiments, the first rectifier module 120 includes a first transformer 121 and a first rectifier 122. The input end of the first rectifier 122 is connected to the positive terminal of the secondary winding of the first transformer 121, and the output end of the first rectifier 122 is connected to the first switch 140. The first transformer 121 is used to transform high-voltage AC power into low-voltage AC power, and the first rectifier 122 is used to transform low-voltage AC power into low-voltage DC power. The first rectifier 122 can be a diode, a MOS transistor, a transistor, etc.

[0055] The second rectifier module 130 includes a second transformer 131 and a second rectifier 132. The input of the second rectifier 132 is connected to the positive terminal of the secondary winding of the second transformer 131, and the output of the second rectifier 132 is connected to the first switch 140 and the negative terminal of the secondary winding of the first transformer 121. The second transformer 131 is used to transform high-voltage AC power into low-voltage AC power, and the second rectifier 132 is used to transform low-voltage AC power into low-voltage DC power. The second rectifier 132 can be a diode, a MOS transistor, a transistor, or the like.

[0056] In some embodiments, the output voltage of the first rectifier module 120 has multiple levels, and the output voltage of the second rectifier module 130 has multiple levels. The multiple levels can refer to multiple independent levels, for example, output voltages of 5V, 10V, 12V, and 15V. They can also refer to a continuous output range, for example, an output voltage of 5-15V.

[0057] The first rectifier module 120 may illustratively include a first voltage transformer controller, which is connected to the control module 160 and the first transformer 121. The first voltage transformer controller adjusts the output voltage of the first transformer 121 by changing the duty cycle of the primary winding of the first transformer 121. For example, the input voltage of the first transformer 121 may be 110V-220V, and the output voltage of the first transformer 121 may be 5V, 9V, 15V, 20V, etc.

[0058] The second rectifier module 130 may illustratively include a second voltage transformer controller, which is connected to the control module 160 and the second transformer 131. The second voltage transformer controller adjusts the output voltage of the second transformer 131 by changing the duty cycle of the primary winding of the second transformer 131. For example, the input voltage of the second transformer 131 may be 110V-220V, and the output voltage of the second transformer 131 may be 5V, 9V, 15V, 20V, etc.

[0059] Because the output voltage values ​​of the first rectifier module 120 and the output voltage values ​​of the second rectifier module 130 have multiple levels, the input voltage value of the first input terminal 111 has multiple levels. By changing the output voltage values ​​of the first rectifier module 120 and the output voltage values ​​of the second rectifier module 130, the input voltage value of the first input terminal 111 can be adjusted, thereby more easily reducing the difference between the input voltage value of the first input terminal 111 and the output voltage value of the first output terminal, thereby improving the conversion efficiency of the output module 110.

[0060] like Figure 9 As shown, in some embodiments, the charging control circuit 100 further includes a third switch 170, which is connected in series between the first rectifier module 120 and the second rectifier module 130. When the second switch 150 and the third switch 170 are both disconnected and the first switch 140 is closed, the first rectifier module 120 alone supplies power to the output module 110. The provision of the third switch 170 increases the adjustment options for the charging control circuit 100. In particular, when the maximum output voltages of the first rectifier module 120 and the second rectifier module 130 differ, the more efficient of the two rectifier modules 120, 130, can be selected for power supply, thereby providing greater flexibility in power supply.

[0061] In some embodiments, the charging control circuit 100 further includes a first capacitor C1 , a second capacitor C2 , and a third capacitor C3 .

[0062] One end of the first capacitor C1 is connected to the output end of the first rectifier 122, and the other end of the first capacitor C1 is connected to the negative terminal of the secondary winding of the first transformer 121. The first capacitor C1 is used to filter the first rectifier module 120, making the DC power output by the first rectifier module 120 purer.

[0063] One end of the second capacitor C2 is connected to the output end of the second rectifier 132, and the other end of the second capacitor C2 is connected to the negative terminal of the secondary winding of the second transformer 131. The second capacitor C2 is used to filter the second rectifier module 130, making the DC power output by the second rectifier module 130 purer.

[0064] One end of the third capacitor C3 is connected to the first input terminal 111, and the other end of the third capacitor C3 is connected to the negative terminal of the secondary winding of the second transformer 131. The third capacitor C3 is used to filter the DC power generated by the superposition of the first rectifier module 120 and the second rectifier module 130, thereby making the DC power output by the superposition of the first rectifier module 120 and the second rectifier module 130 purer.

[0065] It can be understood that in this embodiment, a single larger rectifier module is split into a smaller first rectifier module 120 and a second rectifier module 130. Correspondingly, the filter capacitor is split from a single larger capacitor into a smaller first capacitor C1 and a second capacitor C2. Therefore, the volume of the first capacitor C1 and the second capacitor C2 are both smaller than that of the single larger capacitor, which is beneficial to the internal arrangement of the charging device 10.

[0066] like Figure 10 As shown, in some embodiments, the charging control circuit 100 further includes a third rectifier module 180 and a fourth switch 190. The third rectifier module 180 is connected in series with the second rectifier module 130 and the first rectifier module 120, and the fourth switch 190 is connected in series between the third rectifier module 180 and the second rectifier module 130. By closing the fourth switch 190, the third rectifier module 180, the second rectifier module 130, and the first rectifier module 120 are sequentially connected in series, thereby jointly supplying power to the output module 110. It is understood that the charging control circuit 100 may further include more rectifier modules and switches to implement more power supply modes.

[0067] like Figure 11 As shown, the third aspect of the embodiment of the present application provides a charging method, which includes the following steps.

[0068] S101, obtaining the expected voltage and expected current of the external load, and calculating the expected power.

[0069] S102 : If the expected voltage value of the external load is greater than the maximum output voltage value of the second rectifier module 130 , the first switch 140 is closed and the second switch 150 is opened.

[0070] When the expected voltage value is greater than the maximum output voltage of the second rectifier module 130, since the second rectifier module 130 is insufficient to meet the voltage requirement of the external load, the first switch 140 can be closed and the second switch 150 can be opened. The first rectifier module 120 and the second rectifier module 130 are connected in series to jointly power the output module 110, so that the voltage value of the first input terminal 111 is as close as possible to the voltage value of the first output terminal, thereby improving the charging efficiency.

[0071] S103 : If the expected power of the external load is greater than the maximum output power of the second rectifier module 130 , the first switch 140 is closed and the second switch 150 is opened.

[0072] When the expected power is greater than the maximum output power of the second rectifying module 130, the first switch 140 is closed and the second switch 150 is opened, and the first rectifying module 120 and the second rectifying module 130 are connected in series to supply power to the output module 110, so that the charging power of the external load reaches the maximum, and the charging efficiency is improved.

[0073] In S104, the output voltage values of the first rectifying module 120 and the second rectifying module 130 are adjusted so that the absolute value of the difference between the input voltage value of the first input end 111 and the output voltage value of the first output end reaches the minimum.

[0074] By adjusting the output voltage values of the first rectifying module 120 and the second rectifying module 130, the input voltage value of the first input end 111 and the output voltage value of the first output end are as close as possible, so that the conversion efficiency of the output module 110 is improved.

[0075] For example, the expected voltage of the external load is 20V, the expected current is 5A, and the expected power is 100W. The output voltage of the second rectifying module 130 is 5-10V, the maximum output current is 5A, and the maximum output power is 50W. The output voltage of the first rectifying module 120 is 10-20V, the maximum output current is 5A, and the maximum output power is 100W. The second rectifying module 130 and the first rectifying module 120 are connected in series to output to the external load. The second rectifying module 130 can output 10V voltage and 5A current, and the first rectifying module 120 can output 10V voltage and 5A current. Alternatively, the second rectifying module 130 can output 7V voltage and 5A current, and the first rectifying module 120 can output 13V voltage and 5A current. Alternatively, the second rectifying module 130 can output 5V voltage and 5A current, and the first rectifying module 120 can output 15V voltage and 5A current.

[0076] For example, the expected voltage of the external load is 20V, the expected current is 5A, and the expected power is 100W. The output voltage of the second rectifying module 130 is 5-10V, the maximum output current is 5A, and the maximum output power is 50W. The output voltage of the first rectifying module 120 is 10-20V, the maximum output current is 5A, and the maximum output power is 100W. The second rectifying module 130 and the first rectifying module 120 are connected in series to output to the external load. The second rectifying module 130 can output 10V voltage and 5A current, and the first rectifying module 120 can output 10V voltage and 5A current. Alternatively, the second rectifying module 130 can output 7V voltage and 5A current, and the first rectifying module 120 can output 13V voltage and 5A current. Alternatively, the second rectifying module 130 can output 5V voltage and 5A current, and the first rectifying module 120 can output 15V voltage and 5A current.

[0077] It should be noted that the rectifier module has a high-efficiency range and a low-efficiency range. Its efficiency is low when the rectifier module is fully loaded or lightly loaded, and high when it is intermediately loaded. Therefore, the output voltage value of the first rectifier module 120 and the output voltage value of the second rectifier module 130 can be the same or different. Adjustments can be made based on the output characteristics of the first rectifier module 120 and the second rectifier module 130 so that the first rectifier module 120 and the second rectifier module 130 operate in a high-efficiency range overall.

[0078] For example, if the external load's desired voltage is 20V, the desired current is 5A, and the desired power is 100W, the second rectifier module 130's output voltage is 5-10V, the maximum output current is 5A, and the maximum output power is 50W, while the first rectifier module 120's output voltage is 10-20V, the maximum output current is 5A, and the maximum output power is 100W. When the second rectifier module 130 and the first rectifier module 120 are connected in series to the external load, the second rectifier module 130 can output a voltage of 5V and a current of 5A, while the first rectifier module can output a voltage of 15V and a current of 5A. At this point, both the second rectifier module 130 and the first rectifier module 120 are at intermediate load, resulting in relatively high efficiency. Conversely, if the second rectifier module 130 outputs a voltage of 10V and a current of 5A, while the first rectifier module outputs a voltage of 10V and a current of 5A, the second rectifier module is at full load, resulting in relatively low efficiency, thus affecting overall efficiency.

[0079] If the expected power of the external load is less than the maximum output power of the second rectifier module 130 , the first switch 140 is opened and the second switch 150 is closed, or the first switch 140 is closed and the second switch 150 is opened.

[0080] When the desired power is less than or equal to the maximum output power of the second rectifier module 130, the second rectifier module 130 can independently power the output module 110, or the first rectifier module 120 and the second rectifier module 130 can be connected in series to jointly power the output module 110. Specifically, the power supply depends on the voltage output range of the second rectifier module 130 and the voltage output range of the first rectifier module 120 and the second rectifier module 130 connected in series, with the ultimate goal of ensuring that the voltage value at the first input terminal 111 is as close as possible to the voltage value at the first output terminal.

[0081] like Figure 12 As shown, in some embodiments, before adjusting the output voltage values ​​of the first rectifier module 120 and the second rectifier module 130 , the charging method further includes the following steps.

[0082] S201, the expected power value of the external load is less than the maximum output power value of the second rectifier module 130, if the first minimum difference value is less than the second minimum difference value, it indicates that the voltage value of the first input end 111 is closer to the voltage value of the first output end when the second rectifier module 130 outputs alone, at this time, the first switch 140 is opened, and the second switch 150 is closed.

[0083] S202, the expected power value of the external load is less than the maximum output power value of the second rectifier module 130, if the first minimum difference value is greater than the second minimum difference value, it indicates that the voltage value of the first input end 111 is closer to the voltage value of the first output end when the second rectifier module 130 and the first rectifier module 120 are connected in series, at this time, the first switch 140 is closed, and the second switch 150 is opened.

[0084] The minimum one of the absolute values of the difference between the output voltage value of the second rectifier module 130 and the output voltage value of the first output end is the first minimum difference value, and the minimum one of the absolute values of the difference between the output voltage value of the second rectifier module 130 connected in series with the first rectifier module 120 and the voltage value of the first output end is the second minimum difference value.

[0085] For example, if the expected voltage of the external load is 5V, the expected current is 5A, and the expected power is 25W, the output voltage of the first rectifier module 120 is 5-10V, the maximum output current is 5A, and the maximum output power is 50W, the output voltage of the second rectifier module 130 is 10-20V, the maximum output current is 5A, and the maximum output power is 100W. At this time, the first minimum difference value is 5V, and the second minimum difference value is 10V, so that the conversion efficiency of the output module 110 is higher when the second rectifier module 130 outputs alone.

[0086] If the expected voltage of the external load is 25V, the expected current is 2A, and the expected power is 50W, the output voltage of the first rectifier module 120 is 5-10V, the maximum output current is 5A, and the maximum output power is 50W, the output voltage of the second rectifier module 130 is 10-20V, the maximum output current is 5A, and the maximum output power is 100W. At this time, the first minimum difference value is 5V, and the second minimum difference value is 0V, so that the conversion efficiency of the output module 110 is higher when the second rectifier module 130 and the first rectifier module 120 are connected in series.

[0087] If the desired voltage of the external load is 35V, the desired current is 2A, and the desired power is 70W, the output voltage of the first rectifier module 120 is 5-10V, the maximum output current is 5A, and the maximum output power is 50W, and the output voltage of the second rectifier module 130 is 10-20V, the maximum output current is 5A, and the maximum output power is 100W. At this time, the first minimum difference is 15V, and the second minimum difference is 5V, so that the second rectifier module 130 and the first rectifier module 120 are connected in series to output, and the conversion efficiency of the output module 110 is higher.

[0088] In some embodiments, the charging method further comprises the following steps.

[0089] S301, if the first minimum difference is equal to the second minimum difference, the first switch 140 is closed, and the second switch 150 is opened.

[0090] Generally, the efficiency of the output module 110 in voltage reduction is higher than that in voltage increase, so that the output module 110 has the same voltage reduction amplitude and voltage increase amplitude, and voltage reduction is preferred.

[0091] For example, if the desired voltage of the external load is 20V, the desired current is 2A, and the desired power is 40W, the output voltage of the first rectifier module 120 is 25-40V, the maximum output current is 2A, and the maximum output power is 80W, and the output voltage of the second rectifier module 130 is 5-10V, the maximum output current is 5A, and the maximum output power is 50W. At this time, the first minimum difference is 10V, and the second minimum difference is 10V, so that the efficiency of the output module 110 in voltage reduction is higher, and the second rectifier module 130 and the first rectifier module 120 are connected in series to output, and the conversion efficiency of the output module 110 is higher.

[0092] In the drawings of the present embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present application, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0093] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charge control circuit, characterized by comprising: The charging control circuit comprises: an output module having a first input end and a first output end, the first output end being used for connecting with an external load, the output module being capable of adjusting an output voltage value of the first output end according to a desired voltage value of the external load; a first rectifier module connected with the first input end; a second rectifier module connected with the first rectifier module in series and connected with the first input end; a first switch connected in series between the first rectifier module and the first input end; a second switch connected in series between the second rectifier module and the first input end; a control module connected with the output module, the first switch and the second switch; wherein the control module outputs a cooperation result of the first rectifier module and the second rectifier module according to a desired current value and a desired voltage value of the external load and output specifications of the first rectifier module and the second rectifier module, and controls on-off of the first switch and the second switch according to the cooperation result.

2. The charge control circuit according to claim 1, characterized by The output module comprises: a direct current converter having the first input end, the direct current converter adjusting an input voltage of the first input end; an output interface connected with the direct current converter and the control module and having the first output end, the output interface being used for connecting the external load.

3. The charge control circuit according to claim 1, characterized by The first rectifier module has a different architecture type from that of the second rectifier module.

4. The charge control circuit according to claim 1, characterized by The first rectifier module has a plurality of voltage levels, and the second rectifier module has a plurality of voltage levels.

5. The charge control circuit according to claim 1, characterized by The charging control circuit further comprises: a third switch connected in series between the first rectifier module and the second rectifier module.

6. The charge control circuit according to claim 1, wherein The charging control circuit further comprises: a third rectifier module connected with the second rectifier module and the first rectifier module in series; a fourth switch connected in series between the third rectifier module and the second rectifier module.

7. A charging device, characterized by The charging device comprises: a housing; a circuit board arranged in the housing; the charging control circuit according to any one of claims 1-6, the charging control circuit being arranged on the circuit board.

8. A charging method characterized by, The charging method applied to the charging device according to claim 7 comprises: obtaining a desired voltage value and a desired current value of the external load, and calculating a desired power value; if the desired voltage value of the external load is greater than a maximum output voltage value of the second rectifier module, closing the first switch and opening the second switch; if the desired power value of the external load is greater than a maximum output power value of the second rectifier module, closing the first switch and opening the second switch; adjusting output voltage values of the first rectifier module and the second rectifier module to reduce an absolute value of a difference between an input voltage value of the first input end and an output voltage value of the first output end.

9. The charging method according to claim 8, characterized by, Before the adjusting of the output voltage values of the first rectifier module and the second rectifier module, the charging method further comprises: If the expected power value of the external load is less than the maximum output power value of the second rectifying module, the minimum of the absolute values of the difference between the output voltage value of the first output end and the output voltage value of the second rectifying module and the minimum of the absolute values of the difference between the output voltage value of the second rectifying module connected in series with the first rectifying module and the voltage value of the first output end are the first minimum difference value and the second minimum difference value, respectively; If the first minimum difference value is less than the second minimum difference value, the first switch is opened and the second switch is closed; If the first minimum difference value is greater than the second minimum difference value, the first switch is closed and the second switch is opened.

10. The charging method according to claim 9, characterized by, The charging method further comprises: If the first minimum difference value is equal to the second minimum difference value, the first switch is closed and the second switch is opened.

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