Charging circuit and power supply device

Abstract

A charging circuit, comprising: a power supply circuit provided with a power supply end for outputting voltage; a voltage conversion circuit provided with an input end and an output end, the input end being coupled to the power supply end; a switching circuit coupled to the output end and the power supply end; a first output port coupled to the switching circuit; a second output port coupled to the switching circuit; and a control circuit coupled to the voltage conversion circuit and the switching circuit and used for controlling the switching circuit to switch between an on state and an off state; wherein in the on state, the switching circuit is used for enabling the first output port to be coupled to one of the power supply end and the output end, and / or enabling the second output port to be coupled to one of the power supply end and the output end; and in the off state, the switching circuit is used for enabling the first output port and the second output port to be disconnected from the power supply end and the voltage conversion circuit.

Description

Charging circuit and power supply equipment

[0001] This application claims priority to Chinese patent application number 202321655269.4, the contents of which are incorporated herein by reference.

Technical field

[0002] The present application relates to the field of charging technology, and in particular to charging circuits and power supply equipment. [Background Technology]

[0003] With the development of 5G technology and the rapid popularization of consumer electronics, the time people spend using electronic products has increased significantly. As the operating speed and network speed of electrical equipment have increased, the power consumption of electrical equipment has also gradually increased, requiring frequent battery charging.

[0004] As the variety of consumer electronic products increases, the demand for simultaneous charging of multiple devices is also growing. However, different devices require different charging voltages, so there is a need to provide charging circuits and power supply equipment that can charge devices with different charging voltages.

[0005] [Summary of the invention]

[0006] Embodiments of the present application provide a charging circuit and a power supply device to charge devices with different charging voltages.

[0007] In a first aspect, an embodiment of the present application provides a charging circuit, which includes: a power supply circuit having a power supply end for outputting a voltage; a voltage conversion circuit having an input end and an output end, the input end being coupled to the power supply end; a switching circuit coupling the output end and the power supply end; a first output port coupled to the switching circuit; a second output port coupled to the switching circuit; a control circuit coupled to the voltage conversion circuit and the switching circuit, and used to control the switching circuit to switch between a conductive state and a disconnected state; wherein the voltage conversion circuit is used to output a voltage to the output end when the voltage conversion circuit is in a working state, and to stop outputting a voltage to the output end when the voltage conversion circuit is in a non-working state; the switching circuit is used to couple the first output port to one of the power supply end and the output end, and / or couple the second output port to one of the power supply end and the output end in the conductive state; and the switching circuit is in a disconnected state so that the first output port and the second output port are both disconnected from the power supply end and the voltage conversion circuit.

[0008] In a second aspect, an embodiment of the present application provides a power supply device, including a charging circuit and a power module, wherein the power module is coupled to the charging circuit and is used to couple to a charging port of an external power source and / or serve as an internal power source.

[0009] The beneficial effects of the present application are: different from the situation in the related art, the first output port and the second output port can be simultaneously coupled to the power supply end or the voltage conversion circuit output end through a switch, so that the first output port and the second output port can output the same voltage; in addition, the voltage conversion circuit can perform a boost or buck process, so that the output voltage of the output end of the voltage conversion circuit is different from the output voltage of the power supply end. In this state, when the first output port and the second output port are respectively connected to the power supply end and the output end of the voltage conversion circuit, the voltages of the first output port and the second output port are different, so that devices with different charging voltages can be charged.

Brief Description of the Drawings

[0010] FIG1 is a schematic block diagram of a circuit structure of a charging circuit in the related art;

[0011] FIG2 is a schematic block diagram of a circuit structure of a voltage conversion circuit of a charging circuit in the related art;

[0012] FIG3 is a schematic diagram of a module of an embodiment of a power supply device of the present application;

[0013] FIG4 is a schematic block diagram of the circuit structure of an embodiment of a charging circuit of the present application;

[0014] FIG5 is a schematic block diagram of a voltage conversion circuit according to an embodiment of the charging circuit of the present application;

[0015] FIG6 is another circuit schematic block diagram of the voltage conversion circuit involved in the charging circuit embodiment of the present application. [Specific implementation method]

[0016] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0017] After extensive research, the inventors discovered that charging circuits and power supply devices capable of charging devices with different charging voltages are not yet mature enough. Referring to the related art in FIG1 , taking the two-port charging circuit shown in FIG1 as an example, charging circuit 10 generally has a master output port 11 and a slave output port 12 . Master output port 11 can be directly coupled to power supply port 13 , while slave output port 12 can be coupled to power supply port 13 via voltage conversion circuit 14 . For example, if voltage conversion circuit 14 is a Buck-Boost circuit, the Buck-Boost circuit can perform a voltage step-up or step-down process to make the voltage at slave output port 12 greater than, less than, or equal to the voltage at master output port 11 .

[0018] This charging circuit 10 has the advantage of a simple structure, but it also has the following disadvantages: For example, the structure of the Buck-Boost circuit is relatively complex (see Figure 2). Generally speaking, when the Buck-Boost circuit needs to have the functions of boosting and bucking, in addition to the inductor L and the capacitor C, it generally requires four controllable switches (such as MOS tubes). For example, when in the boost state, it is necessary to control switch m1 to remain on, switch m2 to remain off, and switches m3 and m4 to be intermittently turned on and off. When in the buck state, it is necessary to control switch m3 to remain off, switch m4 to remain on, and switches m1 and m2 to be intermittently turned on and off. In addition, the control circuit 15 of the charging circuit 10 needs to have the function of controlling these four switches at the same time, so this may lead to a complex control circuit structure and high cost. Furthermore, the above-mentioned multiple switches may also lead to a decrease in charging efficiency. In order to solve the above technical problems, the present application proposes the following embodiments.

[0019] The following embodiment of the power supply device of this embodiment describes an exemplary structure of the power supply device: Referring to Figure 3, the power supply device 2 may include a charging circuit 20 and a power module 21. The power module 21 may be coupled to the charging circuit 29 for coupling to a charging port of an external power source and / or serving as an internal power source.

[0020] In some embodiments, the power supply device 2 may be an energy storage device, such as a portable power bank. In this case, the power module 21 may include a battery for coupling to a charging port of an external power source and serving as an internal power source. In other examples, the power supply device 2 may also be a charger. In this case, the power module 21 may also be used only for coupling to a charging port of an external power source.

[0021] For details about the charging circuit 20 involved in the power supply device embodiment, please refer to the following description of the charging circuit embodiment of the present application. The following charging circuit embodiment of the present application describes an exemplary structure of the charging circuit 20.

[0022] The charging circuit 20 described in the embodiment of the charging circuit of the present application is generally coupled between the power module 21 and the power-consuming device. As mentioned above, the output voltage of the charging circuit 20 can be used to charge the power-consuming device 21.

[0023] The charging circuit 20 may include a power supply circuit 210 , a voltage conversion circuit 220 , a switch circuit 230 , a first output port 240 , and a second output port 250 .

[0024] The power supply circuit 210 may include a power supply terminal 211 for outputting a voltage. The voltage conversion circuit 220 may be coupled to the power supply terminal 211 to step up or step down the output voltage from the power supply terminal 211. The first output port 240 and the second output port 250 may be coupled to the power supply terminal 211 or the voltage conversion circuit 220 to output a voltage for charging an external electrical device.

[0025] Specifically, the voltage conversion circuit 220 may have an input terminal 221 and an output terminal 222. The input terminal 221 may be coupled to the power supply terminal 211, and the output terminal 222 may be coupled to the switch circuit 230. The first output terminal and the second output port 250 may be indirectly coupled to the power supply terminal 211 and / or the output terminal 222 of the voltage conversion circuit 220 via the switch circuit 230. That is, the switch circuit 230 may be coupled to the output terminal 222 of the voltage conversion circuit 220 and the power supply terminal 211. The first output port 240 may be coupled to the switch circuit 230. The second output port 250 may be coupled to the switch circuit 230.

[0026] Optionally, the charging circuit 20 further includes a control circuit 260. The control circuit 260 may be coupled to the voltage conversion circuit 220 to control the voltage conversion circuit 220 to switch between an operating state and a non-operating state. Furthermore, the control circuit 260 may be coupled to the switch circuit 230 to control the switch circuit 230 to switch between an on state and an off state.

[0027] Optionally, the switch circuit 230 is configured to, in an on state, couple the first output port 240 to one of the power supply terminal 211 and the output terminal 222, and / or couple the second output port 250 to one of the power supply terminal 211 and the output terminal 222. In an off state, the switch circuit 230 disconnects both the first output port 240 and the second output port 250 from the power supply terminal 211 and the voltage conversion circuit 220.

[0028] That is, when the switch circuit 230 is in the on state, one of the first output port 240 and the second output port 250 can be coupled to the power supply terminal 211 or the output terminal 222 of the voltage conversion circuit 220. In this case, the one of the first output port 240 and the second output port 250 coupled to the power supply terminal 211 or the output terminal 222 of the voltage conversion circuit 220 can output a voltage to power an external device. In this state, the charging circuit 20 can charge a device, and the device can be coupled to the first output port 240 or the second output port 250.

[0029] Furthermore, when the switch circuit 230 is in the on state, one of the first output port 240 and the second output port 250 can be coupled to the power supply terminal 211, and the other can be coupled to the output terminal 222 of the voltage conversion circuit 220. In this case, due to the voltage-boosting or voltage-reducing function of the voltage conversion circuit 220, the output voltages of the first output port 240 and the second output port 250 can be different, thereby enabling charging of two devices with different charging voltages.

[0030] In addition, when the switch circuit 230 is in the on state, the first output port 240 and the second output port 250 can be simultaneously coupled to the power supply terminal 211 or the output terminal 222 of the voltage conversion circuit 220. In this case, the output voltages of the first output port 240 and the second output port 250 are the same, and two devices with the same charging voltage can be charged.

[0031] 4 , in some examples, the switch circuit 230 may include a first switch circuit 231 and a second switch circuit 232. The first switch circuit 231 and the second switch circuit 232 may be coupled to a control circuit 260. The control circuit 260 is configured to control the conduction or disconnection of the first switch circuit 231 and the second switch circuit 232.

[0032] Optionally, when both the first switch circuit 231 and the second switch circuit 232 are disconnected, the switch circuit 230 is in an off state. When at least one of the first switch circuit 231 and the second switch circuit 232 is on, the switch circuit 230 is in an on state. The first switch circuit 231 is configured to couple the first output port 240 to one of the power supply terminal 211 and the output terminal 222 when on. The second switch circuit 232 is configured to couple the second output port 250 to one of the power supply terminal 211 and the output terminal 222 when on.

[0033] In some embodiments, the first switch circuit 231 can be coupled to the power supply terminal 211 and the output terminal 222, and also to the first output port 240. Optionally, the first switch circuit 231 includes a first switch K1 and a second switch K2. The first switch K1 is coupled between the first output port 240 and the power supply terminal 211. The second switch K2 is coupled between the first output port 240 and the output terminal 222.

[0034] The second switch circuit 232 can be coupled to the power supply terminal 211 and the output terminal 222, and can also be coupled to the second output port 250. The second switch circuit 232 can include a third switch K3 and a fourth switch K4. The third switch K3 is coupled between the second output port 250 and the power supply terminal 211. The fourth switch K4 is coupled between the second output port 250 and the output terminal 222.

[0035] The control circuit 260 may be coupled to the first switch K1 , the second switch K2 , the third switch K3 and the fourth switch K4 , respectively, for controlling the on / off switching of the first switch K1 , the second switch K2 , the third switch K3 and the fourth switch K4 .

[0036] When the first switch K1 and the second switch K2 are off, the first switch circuit 231 is off. When one of the first switch K1 and the second switch K2 is on, the first switch circuit 231 is on. When the third switch K3 and the fourth switch K4 are off, the second switch circuit 232 is off. When one of the third switch K3 and the fourth switch K4 is on, the second switch circuit 232 is on.

[0037] In other words, when the first switch K1 is turned on, the first output port 240 can be coupled to the power supply terminal 211. When the second switch K2 is turned on, the first output port 240 can be coupled to the output terminal 222 of the voltage conversion circuit 220. When the third switch K3 is turned on, the second output port 250 can be coupled to the power supply terminal 211. When the fourth switch K4 is turned on, the second output port 250 can be coupled to the output terminal 222 of the voltage conversion circuit 220.

[0038] Optionally, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 each include a control terminal, a first terminal and a second terminal. The control circuit 260 can output a signal (eg, high or low level) to the control terminal to connect or disconnect the first terminal and the second terminal.

[0039] A first end of the first switch K1 is coupled to the first output port 240, a second end of the first switch K1 is coupled to the power supply terminal 211, and a control end of the first switch K1 is coupled to the control circuit 260. A first end of the second switch K2 is coupled to the first output port 240, a second end of the second switch K2 is coupled to the output terminal 222, and a control end of the second switch K2 is coupled to the control circuit 260. A first end of the third switch K3 is coupled to the second output port 250, a second end of the third switch K3 is coupled to the power supply terminal 211, and a control end of the third switch K3 is coupled to the control circuit 260. A second end of the fourth switch K4 is coupled to the second output port 250, a second end of the fourth switch K4 is coupled to the output terminal 222, and a control end of the fourth switch K4 is coupled to the control circuit 260.

[0040] Specifically, the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 can be MOS transistors (i.e., field-effect transistors). The gate of the MOS transistor can serve as the control terminal, and the source and drain can serve as the first terminal and the second terminal, respectively. When the gate voltage changes from a high level to a low level or from a low level to a high level, the first terminal and the second terminal can be switched between an on and off state.

[0041] In this case, although there are a large number of first switches K1, second switches K2, third switches K3 and fourth switches K4, and they all need to be controlled by the control circuit 260, the above four switches do not need to be frequently turned on and off periodically during the charging process, thereby reducing the requirements for the control circuit 260.

[0042] In other examples, the first switching circuit 231 may include a first single-pole double-throw analog switch (not shown). The first single-pole double-throw analog switch may include a first pole terminal and two first single-throw terminals. The first pole terminal is coupled to the first output port 240. The power supply terminal 211 and the output terminal 222 are coupled to the two first single-throw terminals in a one-to-one correspondence. The control circuit 260 is coupled to the first pole terminal to control the disconnection between the first pole terminal and the two first single-throw terminals, or to couple one of the two first single-throw terminals. When the control circuit 260 controls the first pole terminal to be coupled to a certain first single-throw terminal, the first output port 240 can be coupled to the power supply terminal 211 or the output terminal 222 of the voltage conversion circuit 220.

[0043] In other examples, the first switching circuit 231 may include a first single-pole three-throw analog switch (not shown). The first single-pole three-throw analog switch may include a first pole terminal and three first single-throw terminals. The first pole terminal may be coupled to the first output port 240. The power supply terminal 211 and the output terminal 222 are coupled to two of the first single-throw terminals in a one-to-one correspondence. The other first single-throw terminal is left floating. The control circuit 260 is coupled to the first pole terminal and is used to control the first pole terminal to selectively couple to one of the three first single-throw terminals. When the control circuit 260 controls the first pole terminal to couple to the suspended first single-throw terminal, the first output port 240 does not output a voltage. When the control circuit 260 controls the first pole terminal to couple to the first single-throw terminal connected to the power supply terminal 211, the output voltage of the first output port 240 is the output voltage of the power supply terminal 211. When the control circuit 260 controls the first pole terminal to be coupled to the first single-throw terminal of the output terminal 222 of the voltage conversion circuit 220 , the output voltage of the first output port 240 is the output voltage of the voltage conversion circuit 220 .

[0044] Similarly, the second switch circuit 232 may also include a second single-pole double-throw analog switch (not shown). The second single-pole double-throw analog switch includes a second pole terminal and two second single-throw terminals. The first pole terminal is coupled to the second output port 250. The power supply terminal 211 and the output terminal 222 are coupled to the two second single-throw terminals in a one-to-one correspondence. The control circuit 260 is coupled to the second pole terminal and is configured to control whether the second pole terminal is disconnected from the two first single-throw terminals or coupled to one of the two second single-throw terminals.

[0045] Additionally, the second switch circuit 232 may also include a second single-pole, three-throw analog switch (not shown). The second single-pole, three-throw analog switch includes a second pole terminal and three second single-throw terminals. The second pole terminal is coupled to the second output port 250. The power supply terminal 211 and the output terminal 222 are coupled to two of the second single-throw terminals in a one-to-one correspondence, with the other second single-throw terminal left floating. A control circuit 260 is coupled to the second pole terminal for controlling the second pole terminal to selectively couple to one of the three second single-throw terminals.

[0046] The operating principle of the second switch circuit 232, including a second single-pole double-throw analog switch or a second single-pole triple-throw analog switch, can be referred to the first switch circuit 231 and will not be described in detail here. In addition, the first switch circuit 231 and the second switch circuit 232 can also be of different types, for example, one including two switches and the other including a single-pole double-throw (single-pole triple-throw) analog switch.

[0047] The voltage conversion circuit 220 can be configured to output a voltage to the output terminal 222 in an operating state, and stop outputting a voltage to the output terminal 222 in a non-operating state.

[0048] Optionally, the voltage conversion circuit 220 is a boost circuit when in operation. The control circuit 260 obtains the first voltage feedback information and the second voltage feedback information to couple the first output port 240 and the second output port 250 with a higher required voltage to the output terminal 222, and couple the second output port with a lower required voltage to the power supply terminal 211.

[0049] For example, if the required voltage of the first output port 240 is higher than the required voltage of the second output port 250, since the voltage conversion circuit 220 is a boost circuit, the voltage at the output port 222 is higher than the voltage at the power supply port 211. The control circuit 260 can control the first switch circuit 231 to couple the first output port 240 to the output port 222, and control the second switch circuit 232 to couple the second output port 250 to the power supply port 211. As described above, the first switch circuit 231 may include a first switch K1 and a second switch K2, and may also be a first single-pole double-throw analog switch or a first single-pole triple-throw analog switch. The second switch circuit 232 may include a third switch K3 and a fourth switch K4, and may also be a first single-pole double-throw analog switch or a first single-pole triple-throw analog switch.

[0050] Optionally, the voltage conversion circuit 220 is a step-down circuit when in operation. The control circuit 260 obtains the first voltage feedback information and the second voltage feedback information to couple the first output port 240 and the second output port 250 with a higher required voltage to the power supply terminal 211, and couple the second output port with a lower required voltage to the output terminal 222.

[0051] For example, if the required voltage of the first output port 240 is higher than the required voltage of the second output port 250, since the voltage conversion circuit 220 is a step-down circuit, the voltage at the power supply terminal 211 is higher than the voltage at the output terminal 222. The control circuit can control the first switch circuit 231 to couple the first output port 240 to the power supply terminal 211, and control the second switch circuit 232 to couple the second output port 250 to the output terminal 222.

[0052] Considering that the required voltages of the first output port 240 and the second output port 250 may be different in different scenarios, and the difference between the required voltages of the first output port 240 and the second output port 250 is not necessarily fixed, the voltage conversion circuit 220 needs to have the function of adjusting the difference between the voltage of the output terminal 222 and the voltage of the power supply terminal 211.

[0053] Optionally, the voltage conversion circuit 220 is a boost chopper circuit or a buck conversion circuit when in operation. In other words, the voltage conversion circuit 220 can be a boost chopper circuit (also known as a Boost circuit, see FIG5 ) or a buck conversion circuit (also known as a Buck circuit, see FIG6 ). The boost chopper circuit is an optional implementation of the boost circuit. The buck conversion circuit is an optional implementation of the buck circuit. Of course, the voltage conversion circuit 220 can also be a Buck-Boost circuit. In this case, the voltage conversion circuit 220 can serve as both a boost chopper circuit (Boost circuit) and a buck conversion circuit (Buck circuit).

[0054] Optionally, the control circuit 260 obtains the first voltage feedback information and the second voltage feedback information to calculate the difference between the required voltages of the first output port 240 and the second output port 250, and adjusts the duty cycle of the switches of the voltage conversion circuit 220 based on the difference. In other words, when the voltage conversion circuit 220 is a boost chopper circuit or a buck converter circuit, the duty cycle of the switches can be adjusted so that the voltage conversion circuit 220 performs boost or buck processing of different amplitudes.

[0055] Optionally, the Buck circuit may include a switch Q1, a switch Q2, an inductor L, and a capacitor C. Switches Q1 and Q2 may be connected in series between the power supply terminal 211 and the ground voltage. The inductor L and capacitor C may be coupled in series across switch Q2. Furthermore, the capacitor C may also be coupled to a load, such as an electrical device connected to the first output port 240 or the second output port 250 in this application.

[0056] In some examples, switch Q1 can be a MOS transistor and coupled to control circuit 260. Switch Q2 can be a unidirectionally conducting diode. Control circuit 260 can control the MOS transistor to periodically switch between on and off states to perform voltage reduction. In other examples, both switch Q1 and switch Q2 can be MOS transistors and coupled to control circuit 260. Control circuit 260 can control switch Q1 and switch Q2 to switch between on and off states at different times and periodically to perform voltage reduction.

[0057] In this case, the output voltage of the voltage conversion circuit 220 is lower than the output voltage of the power supply terminal 211. Furthermore, the output voltage of the voltage conversion circuit 220 can be further varied by adjusting the on-off frequency of the switch Q1 (i.e., the switching duty cycle). Of course, the switch Q1 can also be constantly on, and the switch Q2 can be constantly off. In this case, the output voltage of the voltage conversion circuit 220 can also be equal to the output voltage of the power supply terminal 211.

[0058] The boost circuit may include a switch Q3, a switch Q4, an inductor L, and a capacitor C. The inductor L and the switch Q3 may be connected in series between the power supply terminal 211 and the ground voltage. The capacitor C and the switch Q4 may be coupled in series across the switch Q3. Furthermore, the capacitor C may also be coupled to the load.

[0059] In some examples, switch Q3 can be a MOS transistor and coupled to control circuit 260. Switch Q4 can be a unidirectional conducting diode. Control circuit 260 can control the MOS transistor to periodically switch on and off to perform a voltage boost process. In other examples, both switch Q3 and switch Q4 can be MOS transistors and coupled to control circuit 260. Control circuit 260 can control switch Q3 and switch Q4 to switch between the on and off states at different times and periodically to perform a voltage boost process.

[0060] In this case, the output voltage of the voltage conversion circuit 220 is higher than the output voltage of the power supply terminal 211. Furthermore, the output voltage of the voltage conversion circuit 220 can be further varied by adjusting the on / off frequency of the switch Q3 (i.e., the switch duty cycle). Of course, the switch Q3 can also be kept in the off state, and the switch Q4 can also be kept in the on state. In this case, the output voltage of the voltage conversion circuit 220 can also be equal to the output voltage of the power supply terminal 211.

[0061] In addition, the control circuit 260 may be further coupled to the first output port 240 to obtain first voltage feedback information via the first output port 240 when the first output port 240 receives a power device. The control circuit 260 may also be coupled to the second output port 250 to obtain second voltage feedback information via the second output port 250 when the second output port 250 receives a power device.

[0062] Optionally, the control circuit 260 is coupled to the power supply circuit 210, and is used to control the switch circuit 230 to switch between a non-working state and a working state according to the first voltage feedback information and / or the second voltage feedback information, and to control the switch circuit 230 to switch between a connection state and a disconnection state, so as to output voltage to the power-consuming device through the first output port 240 and / or the second output port 250.

[0063] In addition, the control circuit 260 is also used to control and adjust the power supply circuit 210 to output a matching voltage through the power supply end 211 based on the first voltage feedback information and / or the second voltage feedback information, so that the first output port 240 and / or the second output port 250 can respectively output a voltage that meets the requirements of the corresponding electrical equipment.

[0064] In some scenarios, there may be only one powered device that needs to be charged. This powered device may be coupled to the first output port 240 or the second output port 250. Taking the case where the powered device is coupled to the first output port 240 as an example, the control circuit 260 can control the first switch K1 to open based on the first voltage feedback information from the first output port 240, that is, the powered device can be indirectly coupled to the power supply terminal 211 via the first switch K1.

[0065] In addition, the required voltage of the electrical device may be 5V or 10V. Therefore, the power supply circuit 210 can include a transformer so that the power supply terminal 211 can output different voltages to meet the requirements of different electrical devices. In this case, after the control circuit 260 obtains the first voltage feedback information from the first output port 240, it can also control the power supply circuit 210 to output the required voltage of the electrical device.

[0066] Of course, the control circuit 260 can also control the second switch K2 to open, that is, the electrical device can be indirectly coupled to the output terminal 222 of the voltage conversion circuit 220 via the second switch K2. In this case, the control circuit 260 can also control the voltage conversion circuit 220 and the power supply circuit 210 so that the voltage conversion circuit 220 outputs the required voltage of the electrical device. In addition, when the electrical device is coupled to the second output port 250, its operating principle can be referred to when it is coupled to the first output port 240, and will not be repeated here.

[0067] In other scenarios, there may be two electrical devices with different voltage requirements that need to be charged simultaneously. For example, the voltage required by the first output port 240 is greater than the voltage required by the second output port 250.

[0068] When the voltage conversion circuit 220 is a Buck circuit, the output voltage of the power supply terminal 211 can be greater than the output voltage of the output terminal 222 of the voltage conversion circuit 220. In this case, the control circuit 260 can control the first switch K1 and the fourth switch K4 to be conductive, and the second switch K2 and the third switch K3 to be disconnected, based on the first voltage feedback information and the second voltage feedback information, so that the first output port 240 is coupled to the power supply terminal 211, and the second output port 250 is coupled to the output terminal 222 of the Buck circuit. In addition, the control circuit 260 can also control the power supply circuit 210 to match its output voltage with the required voltage of the first output port 240, and further control the Buck circuit to match its output voltage with the required voltage of the second output port 250.

[0069] When the voltage conversion circuit 220 is a Boost circuit, the output voltage of the power supply terminal 211 can be lower than the output voltage of the output terminal 222 of the voltage conversion circuit 220. The control circuit 260 can control the second switch K2 and the third switch K3 to be conductive, and the first switch K1 and the fourth switch K4 to be disconnected, so that the first output port 240 can be coupled to the Boost output terminal 222, and the second output port 250 can be coupled to the power supply terminal 211. In addition, the control circuit 260 can also control the power supply circuit 210 to match its output voltage with the required voltage of the second output port 250, and further control the Boost circuit to match its output voltage with the required voltage of the first output port 240.

[0070] In other scenarios, two electrical devices with the same required voltage may need to be charged simultaneously. In this case, the control circuit 260 can control the first switch K1 and the third switch K3 to be conductive, and the second switch K2 and the fourth switch K4 to be disconnected based on the first voltage feedback information and the second voltage feedback information, so that the first output port 240 and the second output port 250 can be simultaneously coupled to the power supply terminal 211. In this case, the control circuit 260 can also control the power supply circuit 210 based on the first voltage feedback information and the second voltage feedback information to match its output voltage to the required voltage.

[0071] Of course, the control circuit 260 may also control the second switch K2 and the fourth switch K4 to be disconnected based on the first voltage feedback information and the second voltage feedback information, so that the first output port 240 and the second output port 250 can be simultaneously coupled to the output end 222 of the voltage conversion circuit 220. In this case, the control circuit 260 may also control the power supply circuit 210 and the voltage conversion circuit 220 based on the first voltage feedback information and the second voltage feedback information so that the output voltage of the voltage conversion circuit 220 can match the required voltage.

[0072] Of course, the control circuit 260 can also control the first switch K1 and the fourth switch K4 to be turned on and the second switch K2 and the third switch K3 to be turned off, or control the second switch K2 and the third switch K3 to be turned on and the first switch K1 and the fourth switch K4 to be turned off, based on the first voltage feedback information and the second voltage feedback information, so that one of the first control port and the second control port is coupled to the power supply terminal 211 and the other is coupled to the output terminal 222 of the voltage conversion circuit 220. In this case, the control circuit 260 can control the voltage conversion circuit 220 not to perform a voltage step-up or step-down process, so that the output voltage of the voltage conversion circuit 220 is the same as the output voltage of the power supply terminal 211. The control circuit 260 can further control the power supply circuit 210 to match its output voltage with the required voltage.

[0073] Different from the situation in the related art, the first output port 240 and the second output port 250 can be simultaneously coupled to the power supply end 211 or the output end 222 of the voltage conversion circuit 220 through a switch, so that the first output port 240 and the second output port 250 can output the same voltage; in addition, the voltage conversion circuit 220 can perform a boost or buck process so that the output voltage of the output end 222 of the voltage conversion circuit 220 is different from the output voltage of the power supply end 211. In this state, when the first output port 240 and the second output port 250 are respectively connected to the power supply end 211 and the output end 222 of the voltage conversion circuit 220, the voltages of the first output port 240 and the second output port 250 are different, so that devices with different charging voltages can be charged.

[0074] In addition, the charging circuit 20 in the present application may also have 3 or 4 output ports. Correspondingly, the switching circuit 230 may also include a third switching circuit and a fourth switching circuit (not shown) and achieve equivalent technical effects, which will not be repeated here.

[0075] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A charging circuit, characterized in that: include: A power supply circuit having a power supply terminal for outputting a voltage; A voltage conversion circuit, comprising an input terminal and an output terminal, wherein the input terminal is coupled to the power supply terminal; A switch circuit, coupling the output terminal and the power supply terminal; A first output port coupled to the switch circuit; A second output port coupled to the switch circuit; A control circuit, coupled to the voltage conversion circuit and the switch circuit, and used to control the switch circuit to switch between a conductive state and a disconnected state; The voltage conversion circuit is used to output voltage to the output end when the voltage conversion circuit is in a working state, and stop outputting voltage to the output end when the voltage conversion circuit is in a non-working state; the switch circuit is used to enable the first output port to be coupled to one of the power supply end and the output end, and / or the second output port to be coupled to one of the power supply end and the output end in the on state; In the disconnected state, the switch circuit disconnects the first output port and the second output port from the power supply end and the voltage conversion circuit.

2. The charging circuit according to claim 1, characterized in that: The switch circuit includes a first switch circuit and a second switch circuit; the first switch circuit is coupled to the power supply end and the output end, and is coupled to the first output port; The second switch circuit is coupled to the power supply end and the output end, and is coupled to the second output port; The first switch circuit and the second switch circuit are coupled to the control circuit; The control circuit is used to control the conduction or disconnection of the first switch circuit and the second switch circuit; When both the first switch circuit and the second switch circuit are disconnected, the switch circuit is in the disconnected state; when at least one of the first switch circuit and the second switch circuit is turned on, the switch circuit is in the connected state; The first switch circuit is used to couple the first output port to one of the power supply end and the output end when it is turned on; The second switch circuit is used to make the second input The output port is coupled to one of the power supply end and the output end.

3. The charging circuit according to claim 2, characterized in that: The first switch circuit includes a first switch and a second switch, the first switch is coupled between the first output port and the power supply end, and the second switch is coupled between the first output port and the output end; The second switch circuit includes a third switch and a fourth switch, the third switch is coupled between the second output port and the power supply end, and the fourth switch is coupled between the second output port and the output end; Wherein, the control circuit is coupled to the first switch, the second switch, the third switch and the fourth switch respectively, and is used to control the conduction or disconnection of the first switch, the second switch, the third switch and the fourth switch; when the first switch and the second switch are disconnected, the first switch circuit is disconnected; when one of the first switch and the second switch is turned on, the first switch circuit is turned on; when the third switch and the fourth switch are disconnected, the second switch circuit is disconnected; when one of the third switch and the fourth switch is turned on, the second switch circuit is turned on.

4. The charging circuit according to claim 3, characterized in that: The first switch, the second switch, the third switch and the fourth switch each include a control end, a first end and a second end; A first end of the first switch is coupled to the first output port, a second end of the first switch is coupled to the power supply end, and a control end of the first switch is coupled to the control circuit; A first end of the second switch is coupled to the first output port, a second end of the second switch is coupled to the output end, and a control end of the second switch is coupled to the control circuit; A first end of the third switch is coupled to the second output port, a second end of the third switch is coupled to the power supply end, and a control end of the third switch is coupled to the control circuit; A second end of the fourth switch is coupled to the second output port, a second end of the fourth switch is coupled to the output end, and a control end of the fourth switch is coupled to the control circuit.

5. The charging circuit according to claim 2, characterized in that: The first switch circuit includes a first single-pole double-throw analog switch, the first single-pole double-throw analog switch includes a first pole terminal and two first single-throw terminals, and the first pole terminal is coupled to the first output port; The power supply end and the output end are coupled to the two first single-throw terminals in a one-to-one correspondence; The control circuit is coupled to the first pole terminal, and is used to control the first pole terminal to be disconnected from the two first single-throw terminals, or to be coupled to one of the two first single-throw terminals; and / or, The second switch circuit includes a second single-pole double-throw analog switch, the second single-pole double-throw analog switch includes a second pole terminal and two second single-throw terminals, the first pole terminal is coupled to the second output port; the power supply terminal and the output terminal are coupled to the two second single-throw terminals in a one-to-one correspondence; The control circuit is coupled to the second pole terminal and is used to control the second pole terminal to be disconnected from the two first single-throw terminals, or to be coupled to one of the two second single-throw terminals.

6. The charging circuit according to claim 2, characterized in that: The first switch circuit includes a first single-pole three-throw analog switch, the first single-pole three-throw analog switch includes a first pole terminal and three first single-throw terminals; the first pole terminal is coupled to the first output port; the power supply terminal and the output terminal are coupled to two of the first single-throw terminals in a one-to-one correspondence, and the other first single-throw terminal is suspended; The control circuit is coupled to the first pole terminal, and is used to control the first pole terminal to selectively couple to one of the three first single-throw terminals; and / or, The second switch circuit includes a second single-pole three-throw analog switch, the second single-pole three-throw analog switch includes a second pole terminal and three second single-throw terminals; the second pole terminal is coupled to the second output port; the power supply terminal and the output terminal are coupled to two of the second single-throw terminals in a one-to-one correspondence, and the other second single-throw terminal is suspended; The control circuit is coupled to the second pole terminal and is used to control the second pole terminal to selectively couple to one of the three second single-throw terminals.

7. The charging circuit according to any one of claims 1 to 6, characterized in that: The control circuit is coupled to the first output port and is used to obtain first voltage feedback information from the first output port; The control circuit is coupled to the second output port and is used to obtain the second Voltage feedback information; The control circuit is coupled to the power supply circuit, and is used for controlling the voltage conversion circuit to switch between the non-working state and the working state according to the first voltage feedback information and / or the second voltage feedback information.

8. The charging circuit according to claim 7, characterized in that: The control circuit is also used to control and adjust the power supply circuit to output a matching voltage through the power supply end according to the first voltage feedback information and / or the second voltage feedback information, so that the first output port and / or the second output port can respectively output a voltage that meets the requirements of the corresponding electrical equipment.

9. The charging circuit according to claim 8, characterized in that: The voltage conversion circuit is a boost circuit when in the working state, The control circuit obtains the first voltage feedback information and the second voltage feedback information to couple the first output port and the second output port with a higher required voltage to the output end, and couple the first output port and the second output port with a lower required voltage to the power supply end.

10. The charging circuit according to claim 8, characterized in that: The voltage conversion circuit is a step-down circuit when in the working state. The control circuit obtains the first voltage feedback information and the second voltage feedback information to couple the first output port and the second output port with a higher required voltage to the power supply end, and couple the first output port and the second output port with a lower required voltage to the output end.

11. The charging circuit according to claim 8, characterized in that: When the voltage conversion circuit is in the working state, it is a step-up chopper circuit or a step-down conversion circuit. The control circuit obtains the first voltage feedback information and the second voltage feedback information to calculate the difference between the required voltages of the first output port and the second output port, and adjusts the duty cycle of the switch of the voltage conversion circuit according to the difference.

12. A power supply device, characterized in that: include: The charging circuit according to any one of claims 1 to 11; A charging port for coupling to an external power source and / or a power module as an internal power source is coupled to the charging circuit.

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