Power supply apparatus, power reception apparatus, charging system, and charging control method

Abstract

The embodiment of the invention discloses power supply equipment, power receiving equipment, a charging system and a charging control method, the power supply equipment comprises a power supply side controller, a power supply side optical coupling circuit and a power supply side connector, and the power supply side optical coupling circuit is connected with the power supply side controller; the power supply side connector is provided with a power supply side signal transmitting end connected with the power supply side optocoupler circuit; the power supply side optocoupler circuit is connected with the power supply side controller and the power supply side signal sending end in a photoelectric isolation mode, static electricity or peak voltage can be prevented from entering the power supply side controller from the power supply side signal sending end, and therefore the probability that the power supply side controller is damaged can be reduced, the power supply side controller has the long service life, and the service life of the power supply side controller is prolonged. And therefore, the power supply equipment has a relatively long service life.

Description

Technical Field

[0001] The present application relates to the technical field of charging equipment, and in particular to a power supply device, a power receiving device, a charging system and a charging control method. Background Art

[0002] In the relevant technical field, the charging system includes a power supply device and a battery that can be connected to the power supply device. The power supply device can supply power to the battery through a power supply side connector. The power supply device and the battery also have the power supply port, which can supply power to the electrical device independently.

[0003] When the power supply device is accurately connected to the receiving-side connector of the power supply device through the power supply side connector, the power supply device can charge the battery. However, when the power supply side connector and the receiving-side connector are misaligned or there is an interference signal, it is easy to cause adverse effects on the circuit formed by the power supply side connector and the receiving-side connector. Summary of the invention

[0004] The embodiments of the present application provide a power supply device, a powered device, a charging system and a charging control method, which aim to connect a power supply side controller and a power supply side signal sending end in the form of photoelectric isolation by using a power supply side optocoupler circuit, thereby preventing static electricity or spike voltage from entering the power supply side controller from the power supply side signal sending end, thereby reducing the probability of damage to the power supply side controller.

[0005] An embodiment of the present application provides a power supply device, including a power supply side controller, a power supply side optocoupler circuit and a power supply side connector, wherein the power supply side optocoupler circuit is connected to the power supply side controller; the power supply side connector has a power supply side signal sending end connected to the power supply side optocoupler circuit; wherein the power supply side controller controls the power supply side signal sending end to send a power supply side communication signal via the power supply side optocoupler circuit to communicate with a powered device.

[0006] Based on the above embodiment, the power supply side controller and the power supply side signal sending end are connected in the form of photoelectric isolation using a power supply side optocoupler circuit, which can prevent static electricity or spike voltage from entering the power supply side controller from the power supply side signal sending end, thereby reducing the probability of damage to the power supply side controller, so that the power supply side controller has a longer service life, and thus the power supply equipment has a longer service life.

[0007] An embodiment of the present application also provides a powered device, including a powered-side controller, a powered-side optocoupler circuit, and a powered-side connector, wherein the powered-side optocoupler circuit is connected to the powered-side controller; the powered-side connector has a powered-side signal sending end connected to the powered-side optocoupler circuit; wherein the powered-side controller controls the powered-side signal sending end to send a powered-side communication signal via the powered-side optocoupler circuit to communicate with the power supply device.

[0008] Based on the above embodiment, the receiving-side optocoupler circuit is used to connect the receiving-side controller and the receiving-side signal sending end in the form of optoelectronic isolation, which can prevent static electricity or spike voltage from entering the receiving-side controller from the receiving-side signal sending end, thereby reducing the probability of damage to the receiving-side controller, so that the receiving-side controller has a longer service life, and thus the powered device has a longer service life.

[0009] An embodiment of the present application also provides a charging system, including a power supply device and a powered device, the power supply device also including a charging circuit, the charging circuit is connected to a power supply side connector and a power supply side controller, the power supply output end is used to connect to a power receiving input end of the power receiving side connector; the power receiving side connector can be connected to the power supply side connector; wherein, after communication between the power supply device and the powered device is established, the charging circuit charges the powered device.

[0010] Based on the above embodiment, the power supply device is connected to the powered device, and the power supply device sends a power supply side communication signal to the powered device via the power supply side signal sending end, and after receiving the powered side communication signal fed back by the powered device according to the power supply side communication signal, it is determined that the power supply side connector is connected to the power supply side connector accordingly, and the power supply side controller of the power supply device controls the charging circuit to operate so that the charging circuit charges the powered device via the power supply output end, thereby preventing the power supply output end from being connected to the non-power receiving input end of the powered side connector in a powered state, thereby reducing the probability of damage to other ports of the powered side connector, so that the powered side connector can have a longer service life, thereby allowing the powered device to have a longer service life. And because the power supply device has a power supply side optocoupler circuit and the powered device has a power receiving side optocoupler circuit, the probability of interference in communication between the power supply device and the power supply device can be reduced, thereby improving the stability of communication between the power supply device and the powered device, and further improving the accuracy of signal interaction between the power supply device and the powered device.

[0011] The embodiment of the present application also provides a charging control method, which is applied to a power supply device. The charging control method includes:

[0012] Controlling the signal sending end on the power supply side to send the communication signal on the power supply side via the optocoupler circuit on the power supply side;

[0013] After receiving the power receiving side communication signal generated by the power receiving device based on the power supply side communication signal and fed back by the power receiving side signal sending end controlled by the power receiving side optical coupling circuit, the charging circuit is controlled to supply power to the power receiving device.

[0014] The embodiment of the present application also provides a charging control method, which is applied to a powered device. The charging control method includes:

[0015] Detect the communication signal on the power supply side, which is sent by the power supply equipment;

[0016] When receiving the communication signal on the power supply side, the optical coupling circuit on the power receiving side controls the signal sending end on the power receiving side to feed back the communication signal on the power receiving side to the power supply device, so that the charging circuit charges the power receiving device.

[0017] Based on the power supply device of the present application, the power supply side controller and the power supply side signal sending end are connected in the form of photoelectric isolation by using a power supply side optocoupler circuit, which can prevent static electricity or spike voltage from entering the power supply side controller from the power supply side signal sending end, thereby reducing the probability of damage to the power supply side controller, so that the power supply side controller has a longer service life, and thus the power supply device has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the framework structure of a charging system in one embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the circuit structure of a charging system in one embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the circuit structure of a charging system in another embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of the circuit structure of a charging system in another embodiment of the present application;

[0023] Figure 5 This is a flow chart of a charging control method in one embodiment of the present application;

[0024] Figure 6 This is a flow chart of a charging control method in another embodiment of the present application.

[0025] Explanation of reference numerals: 1. Charging system; 11. Power supply device; 111. Power supply side connector; 111A. Power supply side signal sending end; 111B. Power supply side signal receiving end; 112. Power supply side optical coupling circuit; 1121. First primary circuit; 1122. First secondary circuit; 113. Power supply side communication circuit; 114. Charging circuit; 1141. Power control module; 115. First magnet; 12. Power receiving device; 121. Power receiving side connector 121A. Power receiving side signal sending end; 121B. Power receiving side signal receiving end; 122. Power receiving side optical coupling circuit; 1221. Second primary circuit; 1222. Second secondary circuit; 123. Power receiving side communication circuit; 124. Second magnet; OC1. First optical coupling; OC2 , the second optical coupler; U1, the power supply side controller; U2, the power receiving side controller; D1, the first light-emitting element; D2, the second light-emitting element; K1, the first photosensitive element; K2, the second photosensitive element; Q1, the first switching element; Q2, the second switching element; Q3, the third switching element; Q4, the fourth switching element; Q5, the fifth switching element; Q6, the sixth switching element; R1, the first resistor; R2, the second resistor; R3, the third resistor; R4, the fourth resistor; R5, the fifth resistor; R6, the sixth resistor; R7, the seventh resistor; R8, the eighth resistor; R9, the ninth resistor; R10, the tenth resistor; R11, the eleventh resistor; R12, the twelfth resistor; R13, the thirteenth resistor; R14, the fourteenth resistor; C1, the first capacitor. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] Please refer to Figure 1 An embodiment of the present application provides a charging system 1, including a power supply device 11 and a power receiving device 12.

[0028] The power supply device 11 can be connected to the mains, and has a power supply port (not shown in the figure), which can supply power to power-consuming devices via the mains, including but not limited to mobile phones, tablet computers, smart watches, and portable power supplies, and the power supply port includes at least one of a USB port, a Micro USB port, a USB Type-C port, or a Lightning port. The power supply device 11 has a power supply side connector 111.

[0029] The powered device 12 can be connected to the power supply device 11, so that the power supply device 11 can supply power to the powered device 12. The powered device 12 can be a powered device. The powered device 12 includes a powered side connector 121, which can be connected to the power supply side connector 111, so that the power supply device 11 can supply power to the powered device 12.

[0030] It can be understood that the power supply side connector 111 and the power receiving side connector 121 are connectors that can be used together. Exemplarily, the power supply side connector 111 and the power receiving side connector 121 can be at least one of a spring pin connector, a USB connector, a Micro USB connector, a USB Type-C connector, or a Lightning connector. In the embodiment of the present application, the power supply side connector 111 is a spring pin connector, and the power receiving side connector 121 is a contact connector. In other embodiments, the power supply side connector 111 and the power receiving side connector 121 can also be a plug and a socket for matching.

[0031] Please refer to Figure 1 In a specific embodiment, the power supply device 11 includes a power supply side controller U1 and a power supply side optocoupler circuit 112, and the power supply side optocoupler circuit 112 is connected to the power supply side controller U1; the power supply side connector 111 has a power supply side signal sending end 111A connected to the power supply side optocoupler circuit 112; correspondingly, the powered device 12 includes a power receiving side communication circuit 123, and the power receiving side communication circuit 123 is connected to the power receiving side signal receiving end 121B of the power receiving side controller U2, wherein, when the powered device 12 is connected to the power supply device 11 so that the power receiving side connector 121 is correspondingly connected to the power supply side connector 111, the power supply side signal sending end 111A is connected to the power receiving side signal receiving end 121B, and the power supply side controller U1 controls the power supply side signal sending end 111A to send the power supply side communication signal via the power supply side optocoupler circuit 112, thereby realizing communication from the power supply device 11 to the powered device 12.

[0032] Please refer to Figure 1 and Figure 2In a specific embodiment, the power supply side optocoupler circuit 112 includes a first primary circuit 1121 and a first secondary circuit 1122. The first primary circuit 1121 includes a first light-emitting element D1, and the first light-emitting element D1 is controlled by the power supply side controller U1; the first secondary circuit 1122 includes a first photosensitive element K1, and the first photosensitive element K1 is arranged corresponding to the first light-emitting element D1. The positive electrode of the first photosensitive element K1 is connected to the power supply side signal sending terminal 111A, and the negative electrode of the first photosensitive element K1 is connected to the ground terminal of the power supply side connector 111. Among them, the first light-emitting element D1 and the first photosensitive element K1 form a first optocoupler OC1. There is no physical connection between the first light-emitting element D1 and the first photosensitive element K1, so that the electrical signal on one side of the first photosensitive element K1 will not be transmitted to the side of the first light-emitting element D1. Therefore, the first optocoupler OC1 is used to connect the power supply side controller U1 and the power supply side signal sending terminal 111A in the form of photoelectric isolation, which can prevent static electricity or spike voltage from entering the power supply side controller U1 from the power supply side signal sending terminal 111A, thereby reducing the probability of damage to the power supply side controller U1, so that the power supply side controller U1 has a longer service life, and thus the power supply device 11 has a longer service life.

[0033] It can be understood that the first light-emitting element D1 can be a light-emitting diode, and the first photosensitive element K1 can be at least one of a photodiode, a phototransistor, a photoresistor, and a photothyristor. In the embodiment of the present application, there is no limitation on the specific forms of the first light-emitting element D1 and the first photosensitive element K1.

[0034] Please refer to Figure 1 and Figure 2 Furthermore, in a specific embodiment, the first primary circuit 1121 also includes a first resistor R1 and a first switching element Q1, the first end of the first resistor R1 is connected to the power supply end of the power supply side controller U1, and the second end of the first resistor R1 is connected to the positive electrode of the first light-emitting element D1; the input end of the first switching element Q1 is connected to the negative electrode of the first light-emitting element D1, the output end of the first switching element Q1 is grounded, and the controlled end of the first switching element Q1 is connected to the signal output end of the power supply side controller U1.

[0035] After the power supply device 11 is connected to the AC power, the signal sending end 111A on the power supply side is connected to the signal receiving end 121B on the power receiving side, and the signal output end of the power supply side controller U1 controls the first primary circuit 1121 so that the first light-emitting element D1 sends a first light signal to the first photosensitive element K1, and the first photosensitive element K1 changes its on-off state according to the first light signal, so that after the power supply device 11 is connected to the power receiving device 12, the power supply device 11 can send a power supply side communication signal to the power receiving device 12.

[0036] Specifically, the first resistor R1 is used to divide the voltage of the first light-emitting element D1 when the first switch element Q1 is turned on, so as to prevent the first light-emitting element D1 from being burned out, so that the first light-emitting element D1 can have a longer service life, so that the first primary circuit 1121 has a longer service life, and further the charging system 1 has a longer service life. And because after the first switch element Q1 is controlled to be turned on, the voltage drop between the input end and the output end of the first switch element Q1 is small, and the voltage drop between the positive electrode and the negative electrode of the first light-emitting element D1 is also small, so that the first resistor R1 can be used to prevent the power supply end and the ground end of the power supply side controller U1 from being short-circuited, so that the probability of damage to the power supply side controller U1 can be reduced, so that the charging system 1 has a longer service life.

[0037] Exemplarily, the power supply side communication signal may be a pulse width modulation signal (PWM), and the first switch element Q1 may be at least one of a bipolar junction transistor (BJT), a field effect transistor (MOS), an insulated gate bipolar transistor (IGBT), and an electromagnetic relay. In the embodiment of the present application, the specific forms of the power supply side communication signal and the first switch element Q1 are not limited.

[0038] Please refer to Figure 1 and Figure 2 In a specific embodiment, the first switching element Q1 can be a field effect transistor, and the short response time of the field effect transistor can be utilized to make the first primary circuit 1121 more sensitive, thereby reducing the response time of the first primary circuit 1121 and improving the overall response speed of the charging system 1.

[0039] Please refer to Figure 2 , exemplarily, in a specific embodiment, the first switch element Q1 can be an NMOS tube (N-Metal-OxiRe-SemiconRuctor, N-type metal oxide semiconductor transistor), the controlled end of the first switch element Q1 is the gate of the NMOS tube, the input end of the first switch element Q1 is the drain of the NMOS tube, the output end of the first switch element Q1 is the source of the NMOS tube, and the signal output end of the power supply side controller U1 controls the gate of the NMOS tube so that the drain and source of the NMOS tube are switched between on and off, so that the first light-emitting element D1 can send a power supply side communication signal. It can be understood that the first switch element Q1 can also be a PMOS tube (P-Metal-OxiRe-SemiconRuctor, P-type metal oxide semiconductor transistor), which will not be described in detail here.

[0040] Please refer to Figure 1 and Figure 2 Furthermore, in a specific embodiment, the first primary circuit 1121 also includes a second resistor R2, a first end of the second resistor R2 is connected to the controlled end of the first switching element Q1, and a second end of the second resistor R2 is connected to the output end of the first switching element Q1, so that there is a voltage difference between the controlled end and the output end of the first switching element Q1, so that the first switching element Q1 is turned on.

[0041] Please refer to Figure 1 and Figure 2 In a specific embodiment, the first primary circuit 1121 also includes a third resistor R3, a first end of the third resistor R3 is connected to the positive electrode of the first light-emitting element D1, a second end of the third resistor R3 is connected to the negative electrode of the first light-emitting element D1, and the third resistor R3 is connected in parallel with the first light-emitting element D1, so that when the first switch element Q1 is turned on, the third resistor R3 stabilizes the voltage across the first light-emitting element D1, thereby stabilizing the light emission of the first light-emitting element D1, so as to improve the stability of the optical signal transmission between the first light-emitting element D1 and the first photosensitive element K1.

[0042] Please refer to Figure 1 and Figure 2 In a specific embodiment, the power receiving side communication circuit 123 includes a seventh resistor R7, an eighth resistor R8 and a third switch element Q3, the first end of the seventh resistor R7 is connected to the power supply end of the power receiving side controller U2, and the second end of the seventh resistor R7 is connected to the power receiving side signal receiving end 121B; the first end of the eighth resistor R8 is connected to the first end of the seventh resistor R7; the input end of the third switch element Q3 is connected to the second end of the eighth resistor R8, the output end of the third switch element Q3 is grounded, the controlled end of the third switch element Q3 is connected to the second end of the seventh resistor R7, and the input end of the third switch element Q3 is connected to the signal input end of the power receiving side controller U2.

[0043] Specifically, after the power supply device 11 is connected to the powered device 12, the signal receiving terminal 121B on the powered side is connected to the signal sending terminal 111A on the powered side, so that the first photosensitive element K1 is connected to the power supply terminal of the powered side controller U2 via the seventh resistor R7, so that the power supply terminal of the powered side controller U2 can power the first photosensitive element K1, so that the first photosensitive element K1 switches between on and off according to the first light signal of the first light-emitting element D1, thereby realizing signal transmission from the power supply device 11 to the powered device 12.

[0044] When the first light-emitting element D1 is not emitting light, the first photosensitive element K1 is turned off and the third switch element Q3 is turned on, so that the signal input end of the power receiving side controller U2 can receive a low-level signal; when the first light-emitting element D1 is emitting light, the first photosensitive element K1 is turned on and the third switch element Q3 is turned off, so that the signal input end of the power receiving side controller U2 can receive a low-level signal, thereby enabling the power supply device 11 to send a power supply side communication signal to the power receiving device 12.

[0045] When the first photosensitive element K1 is turned on, the voltage drop between the positive and negative electrodes of the first photosensitive element K1 is small, and the seventh resistor R7 can be used to prevent a short circuit between the power supply terminal and the ground terminal of the power receiving side controller U2, so as to reduce the probability of damage to the power receiving side controller U2; when the third switch element Q3 is turned on, the voltage drop between the input terminal and the output terminal of the third switch element Q3 is small, and the eighth resistor R8 can be used to prevent a short circuit between the power supply terminal and the ground terminal of the power receiving side controller U2, thereby reducing the probability of damage to the power receiving side controller U2, and both can make the charging system 1 have a longer service life.

[0046] Exemplarily, the third switch element Q3 may be at least one of a triode, a field effect transistor, an insulated gate bipolar transistor, and an electromagnetic relay. In the embodiment of the present application, the specific form of the third switch element Q3 is not limited.

[0047] Please refer to Figure 1 and Figure 2 In a specific embodiment, the third switch element Q3 may be a field effect transistor, and the short response time characteristic of the field effect transistor may be utilized to make the response of the power receiving side communication circuit 123 more sensitive, thereby reducing the response time of the power receiving side communication circuit 123 and improving the overall response speed of the charging system 1.

[0048] Please refer to Figure 2 , exemplarily, the third switch element Q3 can be an NMOS tube, the controlled end of the third switch element Q3 is the gate of the NMOS tube, the input end of the third switch element Q3 is the drain of the NMOS tube, and the output end of the third switch element Q3 is the source of the NMOS tube. When the first photosensitive element K1 is turned off, the gate of the NMOS tube is at a high level, so that the drain and source of the NMOS tube are connected, so that the signal input end of the power receiving side controller U2 receives a low level signal; when the first photosensitive element K1 is turned on, the gate of the NMOS tube is at a low level, so that the drain and source of the NMOS tube are disconnected, so that the signal input end of the power receiving side controller U2 receives a high level signal. It can be understood that the third switch element Q3 can also be a PMOS tube, which will not be described here.

[0049] Please refer to Figure 2Furthermore, the power receiving side communication circuit 123 also includes a ninth resistor R9, a first end of the ninth resistor R9 is connected to the controlled end of the third switch element Q3, and a second end of the ninth resistor R9 is connected to the output end of the third switch element Q3, so that there is a voltage difference between the controlled end and the output end of the third switch element Q3, so as to facilitate the conduction of the third switch element Q3.

[0050] Please refer to Figure 1 and Figure 3 In a specific embodiment, the powered device 12 further includes a powered side optocoupler circuit 122, which is connected to the powered side controller U2; the powered side connector 121 has a powered side signal sending end 121A connected to the powered side optocoupler circuit 122; correspondingly, the power supply device 11 includes a power supply side communication circuit 113, which is connected to the power supply side signal receiving end 111B of the power supply side controller U1. When the powered device 12 is connected to the power supply device 11 so that the powered side connector 121 is correspondingly connected to the power supply side connector 111, the powered side signal sending end 121A is connected to the power supply side signal receiving end 111B, and the powered side controller U2 controls the powered side signal sending end 121A to feed back the powered side communication signal via the powered side optocoupler circuit 122 according to the power supply side communication signal, thereby realizing communication between the power supply device 11 and the powered device 12.

[0051] Please refer to Figure 1 and Figure 3 In a specific embodiment, the optocoupler circuit 122 on the power receiving side includes a second primary circuit 1221 and a second secondary circuit 1222. The second primary circuit 1221 includes a second light-emitting element D2, and the second light-emitting element D2 is controlled by the power receiving side controller U2; the second secondary circuit 1222 includes a second photosensitive element K2, and the second photosensitive element K2 is arranged corresponding to the second light-emitting element D2. The positive electrode of the second photosensitive element K2 is connected to the signal sending terminal 121A on the power receiving side, and the negative electrode of the second photosensitive element K2 is connected to the ground terminal of the power receiving side connector 121. Among them, the second light-emitting element D2 and the second photosensitive element K2 form a second optocoupler OC2. There is no physical connection between the second light-emitting element D2 and the second photosensitive element K2, so that the electrical signal on one side of the second photosensitive element K2 will not be transmitted to the other side of the second light-emitting element D2. Therefore, the second optocoupler OC2 is used to connect the power-receiving side controller U2 and the power-receiving side signal sending terminal 121A in the form of photoelectric isolation, which can prevent static electricity or spike voltage from entering the power-receiving side controller U2 from the power-receiving side signal sending terminal 121A, thereby reducing the probability of damage to the power-receiving side controller U2, so that the power-receiving side controller U2 has a longer service life, and thus the power-receiving device 12 has a longer service life.

[0052] It can be understood that the second light-emitting element D2 can be a light-emitting diode, and the second photosensitive element K2 can be at least one of a photodiode, a phototransistor, a photoresistor, and a photothyristor. In the embodiment of the present application, there is no limitation on the specific forms of the second light-emitting element D2 and the second photosensitive element K2.

[0053] Please refer to Figure 1 and Figure 3 Furthermore, in a specific embodiment, the second primary circuit 1221 also includes a fourth resistor R4 and a second switching element Q2, the first end of the fourth resistor R4 is connected to the power supply end of the power receiving side controller U2, and the second end of the fourth resistor R4 is connected to the positive electrode of the second light-emitting element D2; the input end of the second switching element Q2 is connected to the negative electrode of the second light-emitting element D2, the output end of the second switching element Q2 is grounded, and the controlled end of the second switching element Q2 is connected to the signal output end of the power receiving side controller U2.

[0054] After the powered device 12 receives the power supply side communication signal sent by the power supply device 11, the signal output end of the powered side controller U2 controls the second primary circuit 1221 so that the second light-emitting element D2 sends a second light signal to the second photosensitive element K2, and the second photosensitive element K2 changes its on-off state according to the second light signal, so that the powered device 12 sends a power receiving side communication signal to the power supply device 11.

[0055] Specifically, the fourth resistor R4 is used to divide the voltage of the second light-emitting element D2 when the second switch element Q2 is turned on, so as to prevent the second light-emitting element D2 from being burned out, so that the second light-emitting element D2 can have a longer service life, so that the second primary circuit 1221 has a longer service life, and further the charging system 1 has a longer service life. And because after the second switch element Q2 is controlled to be turned on, the voltage drop between the input end and the output end of the second switch element Q2 is small, and the voltage drop between the positive electrode and the negative electrode of the second light-emitting element D2 is also small, so that the fourth resistor R4 can be used to prevent the short circuit between the power receiving end and the grounding end of the power receiving side controller U2, so as to reduce the probability of damage to the power receiving side controller U2, so that the charging system 1 has a longer service life.

[0056] Exemplarily, the communication signal on the receiving side may be a pulse width modulation signal, and the second switch element Q2 may be at least one of a triode, a field effect transistor, an insulated gate bipolar transistor, and an electromagnetic relay. In the embodiment of the present application, the specific form of the communication signal on the receiving side and the second switch element Q2 is not limited.

[0057] Please refer to Figure 1 and Figure 3In a specific embodiment, the second switch element Q2 can be a field effect transistor, and the short response time of the field effect transistor can be utilized to make the second primary circuit 1221 more sensitive, thereby reducing the response time of the second primary circuit 1221 and improving the overall response speed of the charging system 1.

[0058] Please refer to Figure 1 and Figure 3 , for example, in a specific embodiment, the second switch element Q2 can be an NMOS tube (N-Metal-OxiRe-SemiconRuctor, N-type metal oxide semiconductor transistor), the controlled end of the second switch element Q2 is the gate of the NMOS tube, the input end of the second switch element Q2 is the drain of the NMOS tube, the output end of the second switch element Q2 is the source of the NMOS tube, and the signal output end of the power receiving side controller U2 controls the gate of the NMOS tube so that the drain and source of the NMOS tube are switched between on and off, so that the second light emitting element D2 can send a power receiving side communication signal. It can be understood that the second switch element Q2 can also be a PMOS tube (P-Metal-OxiRe-SemiconRuctor, P-type metal oxide semiconductor transistor), which will not be described in detail here.

[0059] Please refer to Figure 1 and Figure 3 Furthermore, the second primary circuit 1221 also includes a fifth resistor R5, a first end of the fifth resistor R5 is connected to the controlled end of the second switch element Q2, and a second end of the fifth resistor R5 is connected to the output end of the second switch element Q2, so that there is a voltage difference between the controlled end and the output end of the second switch element Q2, so that the second switch element Q2 is turned on.

[0060] Please refer to Figure 1 and Figure 3 In a specific embodiment, the second primary circuit 1221 also includes a sixth resistor R6, a first end of the sixth resistor R6 is connected to the positive electrode of the second light-emitting element D2, a second end of the sixth resistor R6 is connected to the negative electrode of the second light-emitting element D2, and the sixth resistor R6 is connected in parallel with the second light-emitting element D2, so that when the second switch element Q2 is turned on, the voltage across the second light-emitting element D2 is stable, thereby emitting light stably from the second light-emitting element D2, so as to improve the stability of the optical signal transmission between the second light-emitting element D2 and the second photosensitive element K2.

[0061] Please refer to Figure 1 and Figure 3In a specific embodiment, the power supply side communication circuit 113 includes a tenth resistor R10, an eleventh resistor R11 and a fourth switch element Q4, the first end of the tenth resistor R10 is connected to the power supply end of the power supply side controller U1, and the second end of the tenth resistor R10 is connected to the power supply side signal receiving end 111B; the first end of the eleventh resistor R11 is connected to the first end of the tenth resistor R10; the input end of the fourth switch element Q4 is connected to the second end of the eleventh resistor R11, the output end of the fourth switch element Q4 is grounded, the controlled end of the fourth switch element Q4 is connected to the second end of the tenth resistor R10, and the input end of the fourth switch element Q4 is connected to the signal input end of the power supply side controller U1.

[0062] Specifically, after the power supply device 11 is connected to the powered device 12, the signal receiving terminal 111B on the power supply side is connected to the signal sending terminal 121A on the powered side, so that the second photosensitive element K2 is connected to the power receiving end of the power supply side controller U1 via the tenth resistor R10, so that the power receiving end of the power supply side controller U1 can power the second photosensitive element K2, so that the second photosensitive element K2 switches between on and off according to the second light signal of the second light-emitting element D2, thereby realizing signal transmission from the powered device 12 to the power supply device 11.

[0063] When the second light-emitting element D2 is not emitting light, the second photosensitive element K2 is turned off and the fourth switch element Q4 is turned on, so that the signal input end of the power supply side controller U1 can receive a low-level signal; when the second light-emitting element D2 is emitting light, the second photosensitive element K2 is turned on and the fourth switch element Q4 is turned off, so that the signal input end of the power supply side controller U1 can receive a low-level signal, thereby enabling the powered device 12 to send a powered side communication signal to the power supply device 11.

[0064] When the second photosensitive element K2 is turned on, the voltage drop between the positive and negative electrodes of the second photosensitive element K2 is small, and the tenth resistor R10 can be used to prevent a short circuit between the power receiving end and the grounding end of the power supply side controller U1, thereby reducing the probability of damage to the power supply side controller U1; when the fourth switch element Q4 is turned on, the voltage drop between the input and output ends of the fourth switch element Q4 is small, and the eleventh resistor R11 can be used to prevent a short circuit between the power receiving end and the grounding end of the power supply side controller U1, thereby reducing the probability of damage to the power supply side controller U1, and both can make the charging system 1 have a longer service life.

[0065] Exemplarily, the fourth switch element Q4 may be at least one of a triode, a field effect transistor, an insulated gate bipolar transistor, and an electromagnetic relay. In the embodiment of the present application, the specific form of the fourth switch element Q4 is not limited.

[0066] Please refer to Figure 1 and Figure 3In a specific embodiment, the fourth switch element Q4 can be a field effect transistor, and the short response time of the field effect transistor can be utilized to make the power supply side communication circuit 113 more sensitive, thereby reducing the response time of the power supply side communication circuit 113 to improve the overall response speed of the charging system 1.

[0067] Please refer to Figure 3 , exemplarily, the fourth switch element Q4 can be an NMOS tube, the controlled end of the fourth switch element Q4 is the gate of the NMOS tube, the input end of the fourth switch element Q4 is the drain of the NMOS tube, and the output end of the fourth switch element Q4 is the source of the NMOS tube. When the second photosensitive element K2 is turned off, the gate of the NMOS tube is at a high level, so that the drain and source of the NMOS tube are connected, so that the signal input end of the power supply side controller U1 receives a low level signal; when the second photosensitive element K2 is turned on, the gate of the NMOS tube is at a low level, so that the drain and source of the NMOS tube are disconnected, so that the signal input end of the power supply side controller U1 receives a high level signal. It can be understood that the fourth switch element Q4 can also be a PMOS tube, which will not be described in detail here.

[0068] Please refer to Figure 3 Furthermore, the power supply side communication circuit 113 also includes a twelfth resistor R12, the second end of the twelfth resistor R12 is connected to the controlled end of the fourth switch element Q4, and the second end of the twelfth resistor R12 is connected to the output end of the fourth switch element Q4, so that there is a voltage difference between the controlled end and the output end of the fourth switch element Q4, so as to facilitate the conduction of the fourth switch element Q4.

[0069] Please refer to Figure 1 and Figure 4 In a specific embodiment, the charging circuit 114 includes a fifth switch element Q5, a sixth switch element Q6 and a power control module 1141, the input end of the fifth switch element Q5 is used to connect to the power supply, and the output end of the fifth switch element Q5 is connected to the power supply side connector 111; the input end of the sixth switch element Q6 is connected to the controlled end of the fifth switch element Q5, the output end of the sixth switch element Q6 is grounded, and the controlled end of the sixth switch element Q6 is connected to the control output end 1C; the power control module 1141 is connected to the output end of the fifth switch element Q5, and the power control module 1141 is used to control the output power of the charging circuit 114. In the embodiment of the present application, the specific form of the power control module 1141 is not limited.

[0070] Please refer to Figure 1-4After the power supply side controller U1 determines that the powered device 12 is connected to the power supply device 11, an enable signal is sent to the controlled end of the sixth switch element Q6 to conduct between the input end and the output end of the sixth switch element Q6, thereby turning on the fifth switch element Q5, so that the charging circuit 114 is turned on, and the charging circuit 114 can charge the powered device 12.

[0071] Exemplarily, the fifth switch element Q5 and the sixth switch element Q6 may be at least one of a triode, a field effect transistor, an insulated gate bipolar transistor and an electromagnetic relay. In the embodiment of the present application, the specific forms of the fifth switch element Q5 and the sixth switch element Q6 are not limited.

[0072] Please refer to Figure 1 and Figure 4 In a specific embodiment, the fifth switch element Q5 and the sixth switch element Q6 can both be field effect transistors. The short response time of the field effect transistors can be utilized to make the charging circuit 114 more sensitive, thereby reducing the response time of the charging circuit 114 and improving the overall response speed of the charging system 1.

[0073] Please refer to Figure 4 Exemplarily, the fifth switch element Q5 can be a PMOS tube, the controlled end of the fifth switch element Q5 is the gate of the PMOS tube, the input end of the fifth switch element Q5 is the source of the PMOS tube, and the output end of the sixth switch element Q6 is the drain of the PMOS tube.

[0074] Please refer to Figure 4 Furthermore, the charging circuit 114 also includes a thirteenth resistor R13, a first end of the thirteenth resistor R13 is connected to the input end of the fifth switch element Q5, and a second end of the thirteenth resistor R13 is connected to the controlled end of the fifth switch element Q5, so that there is a voltage difference between the controlled end and the output end of the fifth switch element Q5, so that the fifth switch element Q5 is turned on.

[0075] Please refer to Figure 4 , exemplarily, the sixth switch element Q6 may be an NMOS tube, the controlled end of the sixth switch element Q6 is the gate of the NMOS tube, the input end of the sixth switch element Q6 is the drain of the NMOS tube, and the output end of the sixth switch element Q6 is the source of the NMOS tube. When the control output end 1C of the power supply side controller U1 sends an enable signal to the sixth switch element Q6, the sixth switch element Q6 is turned on, thereby turning on the fifth switch element Q5, and further enabling the charging circuit 114 to charge the powered device 12.

[0076] Please refer to Figure 4Furthermore, the charging circuit 114 also includes a fourteenth resistor R14, a first end of the fourteenth resistor R14 is connected to the controlled end of the sixth switch element Q6, and a second end of the fourteenth resistor R14 is connected to the output end of the sixth switch element Q6, so that there is a voltage difference between the controlled end and the output end of the sixth switch element Q6, so that the sixth switch element Q6 is turned on.

[0077] It can be understood that the fifth switch element Q5 can also be an NMOS tube, and the sixth switch element Q6 can also be a PMOS tube, which will not be described in detail here.

[0078] Please refer to Figure 4 In a specific embodiment, the charging circuit 114 further includes a first capacitor C1, a first plate of the first capacitor C1 is connected to the input end of the fifth switch element Q5, and a second plate of the first capacitor C1 is connected to the controlled end of the fifth switch element Q5; the first capacitor C1 can be used to filter the power supply connected to the charging circuit 114 to reduce the voltage fluctuation of the charging circuit 114.

[0079] Please refer to Figure 1 In a specific embodiment, the power supply device 11 has at least two first magnets 115, and the power receiving device 12 has at least two second magnets 124, and the first magnets 115 and the second magnets 124 are arranged in a one-to-one correspondence; the first magnets 115 and the second magnets 124 can be used to realize the positioning between the power receiving device 12 and the power supply device 11, and when the first magnets 115 and the corresponding second magnets 124 attract each other, the power receiving side connector 121 and the power supply side connector 111 are correspondingly connected, thereby improving the alignment connection accuracy of the power receiving side connector 121 and the power supply side connector 111, and facilitating the corresponding connection between the power receiving side connector 121 and the power supply side connector 111.

[0080] Please refer to Figure 1-5 In an embodiment of the present application, a charging control method is also provided, which is applied to the power supply device 11. The charging control method includes:

[0081] Step S10 , controlling the power supply side signal sending terminal 111A to send a power supply side communication signal via the power supply side optical coupler circuit 112 .

[0082] In the embodiment of the present application, after the power supply device 11 is connected to the powered device 12 , the power supply device 11 can control the power supply side signal sending terminal 111A to send a power supply side communication signal to the powered device 12 via the first light emitting element D1 and the first photosensitive element K1 .

[0083] It can be understood that after the power supply device 11 is connected to the mains, the power supply side signal sending end 111A is connected to the power receiving side signal receiving end 121B, and the signal output end of the power supply side controller U1 controls the first primary circuit 1121, so that the first light emitting element D1 sends a first light signal to the first photosensitive element K1 at a preset time interval, and the first photosensitive element K1 changes its on-off state according to the first light signal, so that when the power supply side connector 111 is connected to the power receiving side connector 121, the power receiving device 12 can obtain the power supply side communication signal in a shorter time, so as to improve the response speed of the power receiving device 12. Exemplarily, the preset time length can be 200ms, 250ms or 300ms.

[0084] Step S20 , after receiving the power receiving side communication signal generated by the power receiving device 12 based on the power supply side communication signal and fed back by the power receiving side signal sending terminal 121A controlled by the power receiving side optical coupler circuit 122 , control the charging circuit 114 to supply power to the power receiving device 12 .

[0085] In the embodiment of the present application, after the powered device 12 receives the power supply side communication signal sent by the power supply device 11, the signal output end of the powered side controller U2 controls the second primary circuit 1221 so that the second light-emitting element D2 sends a second light signal to the second photosensitive element K2, and the second photosensitive element K2 changes its on-off state according to the second light signal, so that the powered device 12 feeds back the powered side communication signal to the power supply device 11, and the control output end of the power supply side controller U1 sends an enable signal to the controlled end of the fifth switch element Q5, so that the fifth switch element Q5 is turned on, thereby turning on the sixth switch element Q6, so that the charging circuit 114 is turned on, so that the charging circuit 114 can power the powered device 12.

[0086] Please refer to Figure 1-4 as well as Figure 6 In an embodiment of the present application, a charging control method is also provided, which is applied to the powered device 1212. The charging control method includes:

[0087] Step S30 , detecting a power supply side communication signal, where the power supply side communication signal is sent by the power supply device 11 .

[0088] In the embodiment of the present application, the signal input terminal of the power receiving side controller U2 periodically detects whether a power supply side communication signal is received.

[0089] It is understandable that the signal input end of the power receiving side controller U2U2 can detect the power supply side communication signal at intervals of a preset time length, so that when the power supply side connector 111 is connected to the power receiving side connector 121, the power receiving device 12 can obtain the power supply side communication signal in a shorter time to improve the response speed of the power receiving device 12. Exemplarily, the preset time length can be 200ms, 250ms or 300ms.

[0090] Step S40 , when receiving the power supply side communication signal, the power receiving side optical coupler circuit 122 controls the power receiving side signal sending terminal 121A to feed back the power receiving side communication signal to the power supply device 11 , so that the charging circuit 114 charges the power receiving device 12 .

[0091] In the embodiment of the present application, after the powered device 12 receives the power supply side communication signal sent by the power supply device 11, the signal output end of the powered side controller U2 controls the second primary circuit 1221 so that the second light-emitting element D2 sends a second light signal to the second photosensitive element K2, and the second photosensitive element K2 changes its on-off state according to the second light signal, so that the powered device 12 sends the power supply side communication signal to the power supply device 11, and the control output end of the power supply side controller U1 sends an enable signal to the controlled end of the fifth switch element Q5, so that the fifth switch element Q5 is turned on, thereby turning on the sixth switch element Q6, so that the charging circuit 114 is turned on, so that the charging circuit 114 can power the powered device 12.

[0092] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0093] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A power supply device, characterized in that: include: Power supply side controller; A power supply side optical coupler circuit, connected to the power supply side controller; A power supply side connector, comprising a power supply side signal sending end connected to the power supply side optical coupler circuit; The power supply side controller controls the power supply side signal sending end to send a power supply side communication signal via the power supply side optical coupling circuit, so as to communicate with the powered device.

2. The power supply device according to claim 1, characterized in that: The power supply side optocoupler circuit comprises: A first primary circuit includes a first light emitting element, wherein the first light emitting element is controlled by the power supply side controller; The first secondary circuit includes the first photosensitive element, which is arranged corresponding to the first light-emitting element, the positive electrode of the first photosensitive element is connected to the signal sending end of the power supply side, and the negative electrode of the first photosensitive element is connected to the ground end of the power supply side connector.

3. The power supply device according to claim 2, characterized in that: The first primary circuit further comprises: a first resistor, wherein a first end of the first resistor is connected to a power supply end of the power supply side controller, and a second end of the first resistor is connected to a positive electrode of the first light emitting element; A first switch element, wherein an input end of the first switch element is connected to the cathode of the first light-emitting element, an output end of the first switch element is grounded, and a controlled end of the first switch element is connected to a signal output end of the power supply side controller.

4. The power supply device according to claim 3, characterized in that: The first switch element is a field effect tube, the controlled end of the first switch element is the gate of the field effect tube, the input end of the first switch element is the drain of the field effect tube, and the output end of the first switch element is the source of the field effect tube; The first primary circuit further includes a second resistor, a first end of the second resistor is connected to the controlled end of the first switch element, and a second end of the second resistor is connected to the output end of the first switch element; and / or, The first primary circuit further includes a third resistor, a first end of the third resistor is connected to the anode of the first light-emitting element, and a second end of the third resistor is connected to the cathode of the first light-emitting element.

5. A power receiving device, characterized in that: include: Power receiving side controller; A power receiving side optical coupler circuit connected to the power receiving side controller; A power receiving side connector, comprising a power receiving side signal sending end connected to the power receiving side optical coupler circuit; The power receiving side controller controls the power receiving side signal sending end to send a power receiving side communication signal via the power receiving side optical coupling circuit, so as to communicate with the power supply device.

6. The power receiving device according to claim 5, characterized in that: The receiving-side optocoupler circuit comprises: A second primary circuit includes a second light emitting element, wherein the second light emitting element is controlled by the power receiving side controller; The second secondary circuit includes the second photosensitive element, which is arranged corresponding to the second light-emitting element, the positive electrode of the second photosensitive element is connected to the receiving side signal sending end of the receiving side connector, and the negative electrode of the second photosensitive element is connected to the ground end of the receiving side connector.

7. The power receiving device according to claim 6, characterized in that: The second primary circuit further comprises: a fourth resistor, wherein a first end of the fourth resistor is connected to the power supply end of the power receiving-side controller, and a second end of the fourth resistor is connected to the positive electrode of the second light-emitting element; A second switch element, wherein the input end of the second switch element is connected to the cathode of the second light-emitting element, the output end of the second switch element is grounded, and the controlled end of the second switch element is connected to the signal output end of the power receiving side controller.

8. The power receiving device according to claim 7, characterized in that: The second switch element is a field effect tube, the controlled end of the second switch element is the gate of the field effect tube, the input end of the second switch element is the drain of the field effect tube, and the output end of the third switch element is the source of the field effect tube; The second primary circuit further includes a fifth resistor, a first end of the fifth resistor is connected to the controlled end of the second switch element, and a second end of the fifth resistor is connected to the output end of the second switch element; and / or, The second primary circuit further includes a sixth resistor, a first end of the sixth resistor is connected to the anode of the second light-emitting element, and a second end of the sixth resistor is connected to the cathode of the second light-emitting element.

9. A charging system, characterized in that: include: The power supply device according to any one of claims 1 to 4, further comprising a charging circuit, wherein the charging circuit is connected to the power supply output terminal of the power supply side connector and the power supply side controller, and the power supply output terminal is used to connect to the power receiving input terminal of the power receiving side connector; The power receiving device according to any one of claims 5 to 8, wherein the power receiving side connector is connectable to the power supply side connector; After the communication between the power supply device and the powered device is established, the charging circuit charges the powered device.

10. The charging system according to claim 9, characterized in that: The power supply device further comprises a power supply side communication circuit, wherein the power supply side communication circuit is connected to the power supply side controller and the power supply side signal receiving end of the power supply side connector; The power receiving device further comprises a power receiving side communication circuit, wherein the power receiving side communication circuit is connected to a power receiving side signal receiving end of the power receiving side controller; Among them, when the power supply side connector is connected correspondingly to the power receiving side connector, the power receiving side signal receiving end is connected to the power supply side signal sending end, the power supply side signal receiving end is connected to the power receiving side signal sending end, the ground end of the power receiving side connector is connected to the ground end of the power supply side connector, the power supply side controller sends a power supply side communication signal to the power receiving side controller via the power supply side optocoupler circuit and the power receiving side communication circuit, and when the power supply side controller receives the power receiving side communication signal sent by the power receiving side controller via the power receiving side optocoupler circuit and the power supply side communication circuit according to the power supply side communication signal, the power supply side controller controls the charging circuit to charge the powered device.

11. The charging system according to claim 10, characterized in that: The receiving-side communication circuit comprises: a seventh resistor, wherein a first end of the seventh resistor is connected to the power supply end of the power receiving side controller, and a second end of the seventh resistor is connected to the power receiving side signal receiving end; an eighth resistor, a first end of the eighth resistor being connected to the first end of the seventh resistor; A third switching element, wherein the input end of the third switching element is connected to the second end of the eighth resistor, the output end of the third switching element is grounded, the controlled end of the third switching element is connected to the second end of the seventh resistor, and the input end of the third switching element is connected to the signal input end of the power receiving side controller.

12. The charging system according to claim 11, characterized in that: The third switch element is a field effect tube, the controlled end of the third switch element is the gate of the field effect tube, the input end of the third switch element is the drain of the field effect tube, and the output end of the third switch element is the source of the field effect tube; The power receiving side communication circuit further includes a ninth resistor, a first end of the ninth resistor is connected to the controlled end of the third switch element, and a second end of the ninth resistor is connected to the output end of the third switch element.

13. The charging system according to claim 10, characterized in that: The power supply side communication circuit comprises: a tenth resistor, wherein a first end of the tenth resistor is connected to the power supply end of the power supply side controller, and a second end of the tenth resistor is connected to the power supply side signal receiving end; an eleventh resistor, a first end of the eleventh resistor being connected to the first end of the tenth resistor; A fourth switching element, wherein the input end of the fourth switching element is connected to the second end of the eleventh resistor, the output end of the fourth switching element is grounded, the controlled end of the fourth switching element is connected to the second end of the tenth resistor, and the input end of the fourth switching element is connected to the signal input end of the power supply side controller.

14. The power supply circuit according to claim 13, characterized in that: The fourth switch element is a field effect tube, the controlled end of the fourth switch element is the gate of the field effect tube, the input end of the fourth switch element is the drain of the field effect tube, and the output end of the fourth switch element is the source of the field effect tube; The power supply side communication circuit further includes a twelfth resistor, a first end of the twelfth resistor is connected to the controlled end of the fourth switch element, and a second end of the twelfth resistor is connected to the output end of the fourth switch element.

15. The power supply circuit according to claim 9, characterized in that: The charging circuit comprises: a fifth switch element, wherein an input end of the fifth switch element is used to access a power supply, and an output end of the fifth switch element is connected to a power supply output end of the power supply side connector; a sixth switch element, wherein an input end of the sixth switch element is connected to a controlled end of the fifth switch element, an output end of the sixth switch element is grounded, and a controlled end of the sixth switch element is connected to a control output end of the power supply-side controller; A power control module is connected to the output end of the fifth switch element.

16. The power supply circuit according to claim 15, characterized in that: The fifth switch element is a field effect tube, the controlled end of the sixth switch element is the gate of the field effect tube, the input end of the sixth switch element is the source of the field effect tube, and the output end of the sixth switch element is the drain of the field effect tube; The power supply circuit further includes a thirteenth resistor, a first end of the thirteenth resistor is connected to the input end of the fifth switch element, and a second end of the thirteenth resistor is connected to the controlled end of the fifth switch element; and / or, The sixth switch element is a field effect tube, the controlled end of the sixth switch element is the gate of the field effect tube, the input end of the sixth switch element is the drain of the field effect tube, and the output end of the sixth switch element is the source of the field effect tube; The charging circuit further includes a fourteenth resistor, a first end of the fourteenth resistor is connected to the controlled end of the sixth switch element, and a second end of the fourteenth resistor is connected to the output end of the sixth switch element; and / or, The charging circuit further includes a first capacitor, a first plate of the first capacitor is connected to the input end of the fifth switch element, and a second plate of the first capacitor is connected to the controlled end of the fifth switch element.

17. The charging system according to claim 9, characterized in that: The power supply device has at least two first magnets, and the power receiving device has at least two second magnets, and the first magnets and the second magnets are arranged in a one-to-one correspondence; When the first magnet and the corresponding second magnet attract each other, the power receiving-side connector and the power supply-side connector are connected correspondingly.

18. A charging control method, characterized in that: Applied to power supply equipment, the charging control method includes: Controlling the signal sending end on the power supply side to send the communication signal on the power supply side via the optocoupler circuit on the power supply side; After receiving the power receiving side communication signal generated by the power receiving device based on the power supply side communication signal and fed back by the power receiving side signal sending end controlled by the power receiving side optical coupling circuit, the charging circuit is controlled to supply power to the power receiving device.

19. A charging control method, characterized in that: Applied to a powered device, the charging control method comprises: Detecting a power supply side communication signal, where the power supply side communication signal is sent by a power supply device; When the power supply side communication signal is received, the power receiving side optical coupling circuit controls the power receiving side signal sending end to feed back the power receiving side communication signal to the power supply device, so that the charging circuit charges the power receiving device.

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