Power supply circuit and electronic equipment

Abstract

The embodiment of the utility model relates to the technical field of electronics, provides a power supply circuit and electronic equipment, and aims to provide a power supply circuit which can be activated by a charging gun. The power supply circuit comprises an optocoupler isolation module and a switch module. The input end of the switch module is used for receiving a first power signal output by a power supply; the output end of the switch module is electrically connected with a to-be-powered module; the power end of the switch module is used for receiving a second power signal; the control end of the switch module is electrically connected with the optocoupler isolation module; the optocoupler isolation module is used for converting a first control signal output by the charging gun into a second control signal under the condition that the optocoupler isolation module is electrically connected with the charging gun, and transmitting the second control signal to the control end of the switch module; and the switch module is used for keeping on under the control of the second power supply signal and the second control signal under the condition that the optocoupler isolation module is electrically connected with the charging gun, converting the first power supply signal into a third power supply signal and outputting the third power supply signal.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electronic technology, and in particular to a power supply circuit and an electronic device. Background Art

[0002] Energy storage devices have been widely used in new energy and other technical fields. Energy storage devices include devices such as battery management chips, which require power supply to work. Currently, the power supply method of battery management chips and other devices is single, with few options. Utility Model Content

[0003] The embodiments of the present application provide a power supply circuit and an electronic device to provide a power supply circuit that can be activated by a charging gun, thereby increasing the types of power supply methods and improving selectivity.

[0004] According to some embodiments of the present application, on one hand, an embodiment of the present application provides a power supply circuit, including: an optical coupling isolation module and a switch module; wherein the input end of the switch module is used to receive a first power supply signal output by a power supply; the output end of the switch module is used to be electrically connected to a module to be powered; the power supply end of the switch module is used to receive a second power supply signal; and the control end of the switch module is electrically connected to the optical coupling isolation module;

[0005] The optical coupling isolation module is used to convert the first control signal output by the charging gun into a second control signal when electrically connected to the charging gun, and transmit the second control signal to the control end of the switch module;

[0006] The switch module is used to remain turned on under the control of the second power signal and the second control signal when the optocoupler isolation module is electrically connected to the charging gun, convert the first power signal into a third power signal, and output the third power signal; and remain turned off under the control of the second power signal when the optocoupler isolation module is not electrically connected to the charging gun.

[0007] According to some embodiments of the present application, the optocoupler isolation module includes a current limiting sub-module and a photoelectric coupler; the input end of the current limiting sub-module is used to be electrically connected to the charging gun, and the output end of the current limiting sub-module, the photoelectric coupler and the control end of the switch module are electrically connected in sequence.

[0008] According to some embodiments of the present application, the current limiting submodule includes at least one current limiting resistor.

[0009] According to some embodiments of the present application, the optical coupling isolation module further includes a ground terminal and a discharge submodule, and the photoelectric coupler includes a light source and a light receiver;

[0010] The discharge submodule and the light source are arranged in parallel between the output end of the current limiting submodule and the ground end, and the light receiver is electrically connected to the control end of the switch module;

[0011] The discharge submodule is used to discharge the residual power of the light source when the optical coupling isolation module is not electrically connected to the charging gun.

[0012] According to some embodiments of the present application, the discharge submodule includes at least one discharge resistor.

[0013] According to some embodiments of the present application, the switch module includes a first control submodule, a second control submodule and a switch submodule which are electrically connected in sequence;

[0014] The control end of the first control submodule is electrically connected to the optical coupling isolation module, the input end of the first control submodule is used to receive the first power supply signal, the output end of the first control submodule is electrically connected to the control end of the second control submodule, the output end of the second control submodule is grounded, and the input end of the second control submodule is electrically connected to the control end of the switch submodule; the input end of the switch submodule is used to be electrically connected to the power supply, and the output end of the switch submodule is used to be electrically connected to the module to be powered;

[0015] The first control submodule is used to keep conducting under the control of the second power signal and the second control signal when the optical coupling isolation module is electrically connected to the charging gun, and output a third control signal to the second control submodule; the second control submodule is used to keep conducting under the control of the third control signal; the switch submodule is used to keep conducting when the second control submodule is turned on, convert the received first power signal into the third power signal, and output the third power signal;

[0016] The first control submodule is also used to remain turned off under the control of the second power supply signal when the optocoupler isolation module is not electrically connected to the charging gun; the second control submodule is also used to remain turned off when the first control submodule is turned off; the switch submodule is also used to remain turned off when the second control submodule is turned off.

[0017] According to some embodiments of the present application, the power supply circuit further includes a first voltage conversion module and a second voltage conversion module; the input end of the first control submodule is electrically connected to the first voltage conversion module, and the output end of the switch submodule is electrically connected to the module to be powered through the second voltage conversion module;

[0018] The first voltage conversion module is used to be electrically connected to the power supply, convert the first power signal output by the power supply into a second power signal, and transmit the second power signal to the input end of the first control submodule;

[0019] The second voltage conversion module is used to convert the third power supply signal into a power supply signal and transmit the power supply signal to the module to be powered when the optocoupler isolation module is electrically connected to the charging gun; when the optocoupler isolation module is not electrically connected to the charging gun, the module to be powered is not charged.

[0020] According to some embodiments of the present application, the first control submodule includes a first PMOS tube and a first resistor; the second control submodule includes an NMOS tube and a second resistor; the switch submodule includes a second PMOS tube;

[0021] Among them, one end of the first resistor and the source of the first PMOS tube are respectively electrically connected to the first voltage conversion module, the other end of the first resistor and the gate of the first PMOS tube are respectively electrically connected to the optocoupler isolation module, the drain of the first PMOS tube is electrically connected to the gate of the NMOS tube, the source of the NMOS tube is grounded, the drain of the NMOS tube is electrically connected to one end of the second resistor, the other end of the second resistor is electrically connected to the gate of the second PMOS tube, the source of the second PMOS tube is used to be electrically connected to the power supply, and the drain of the second PMOS tube is electrically connected to the second voltage conversion module.

[0022] According to some embodiments of the present application, the switch submodule further includes a voltage regulator tube and a third resistor; the voltage regulator tube and the third resistor are arranged in parallel between the source of the second PMOS tube and the drain of the second PMOS tube.

[0023] According to some embodiments of the present application, on the other hand, an electronic device is provided, comprising: a power supply, a module to be powered and the above-mentioned power supply circuit; the power supply, the power supply circuit and the module to be powered are electrically connected in sequence.

[0024] The embodiments of the present application provide a power supply circuit and an electronic device. After the optocoupler isolation module of the power supply circuit is connected to a charging gun, it can output a second control signal to the switch module. The switch module remains turned on under the control of the second control signal and the second power signal, thereby converting the first power signal output by the power supply into a third power signal, and outputting the third power signal to the module to be powered. That is, the power supply circuit can be activated by the charging gun, so as to supply power to the module to be powered, thereby increasing the power supply mode and improving the selectivity. The power supply circuit is simple, easy to implement, safe and efficient. In addition, when the optocoupler isolation module of the power supply circuit is not connected to the charging gun, the switch module remains turned off under the control of the second power signal, and the power supply cannot supply power to the module to be powered through the switch module. That is, when the power supply circuit is not connected to the charging gun, it will not supply power to the module to be powered, and thus will not affect other power supply circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0028] Figure 3 A schematic diagram of the structure of an optical coupling isolation module provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of the structure of a switch module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0031] In the description of the embodiments of the present application, "at least one" means one or more, and "plurality" means two or more, unless otherwise clearly and specifically defined.

[0032] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] The present application embodiment provides a power supply circuit, referring to Figure 1 and Figure 2 As shown, the power supply circuit 1 includes: an optical coupling isolation module 11 and a switch module 12; wherein the input end ( Figure 2 The B+ terminal shown in FIG. 1 is used to be electrically connected to the power supply 2 and receive the first power signal ( Figure 2 The output terminal of the switch module 12 ( Figure 2 The B+_OUT terminal shown in FIG. 1 is used to electrically connect to the module 3 to be powered; the power supply terminal ( Figure 2 The +3.3V terminal shown) is used to receive the second power signal ( Figure 2 +3.3V signal shown); the control terminal of the switch module 12 ( Figure 2 The WK end shown is electrically connected to the optical coupling isolation module 11.

[0035] The optical coupling isolation module 11 is used to convert the first control signal ( Figure 2 The CP signal shown) is converted into a second control signal ( Figure 2 WK signal shown), the second control signal ( Figure 2 The WK signal shown in FIG. 1 is transmitted to the control end ( Figure 2 WK end shown).

[0036] The switch module 12 is used for switching on the second power signal ( Figure 2 +3.3V signal shown) and the second control signal ( Figure 2 The WK signal shown in FIG. 1 is controlled to remain on, and the first power signal ( Figure 2The B+ signal shown) is converted into a third power signal ( Figure 2 The B+_OUT signal shown in the figure) outputs a third power signal; when the optical coupling isolation module 11 is not electrically connected to the charging gun 4, the second power signal ( Figure 2 The MOSFET remains off under the control of the B+ signal shown.

[0037] The specific structures of the optical coupling isolation module and the switch module are not limited as long as they can achieve the corresponding functions. The voltage value of the second power signal received by the power supply end of the switch module is different from the voltage value of the first power signal received by the input end. Figure 1 As shown, the power supply end of the switch module 12 can be connected to the power supply 2 through the first voltage conversion module 13, and the first voltage conversion module 13 can convert the first power supply signal output by the power supply 1 into a second power supply signal, and output it to the power supply end of the switch module 12. Of course, the power supply end of the switch module can also obtain the second power supply signal from other power supply devices, which is not limited here. For example, the voltage value of the first power supply signal can be greater than the voltage value of the second power supply signal. Figure 2 As shown, the voltage value of the second power supply signal may be +3.3V.

[0038] According to the power supply voltage required by the module to be powered, if the voltage of the third power supply signal output by the output end of the switch module is within the power supply voltage range, the output end of the switch module can be directly electrically connected to the module to be charged. If the voltage of the third power supply signal output by the output end of the switch module is not within the power supply voltage range, Figure 1 As shown, the output end of the switch module 12 is electrically connected to the module to be powered 3 through the second voltage conversion module 14. The second voltage conversion module 14 can convert the third power supply signal into a power supply signal that meets the power supply requirements, thereby supplying power to the module to be powered 3.

[0039] The voltage value of the first control signal output by the charging gun is not limited. For example, the charging gun can output a 12V DC voltage signal. The voltage value of the second control signal can be determined according to the specific structure of the switch module and is not specifically limited here. The voltage values ​​of the first control signal and the second control signal are different. For example, the voltage value of the second control signal can be less than the voltage value of the first control signal.

[0040] An embodiment of the present application provides a power supply circuit. After the optocoupler isolation module of the power supply circuit is connected to the charging gun, it can output a second control signal to the switch module. The switch module remains turned on under the control of the second control signal and the second power signal, thereby converting the first power signal output by the power supply into a third power signal, and outputting the third power signal to the module to be powered. That is, the power supply circuit can be activated by the charging gun, so as to realize power supply to the module to be powered, thereby increasing the power supply mode and improving the selectivity. The power supply circuit is simple, easy to implement, safe and efficient. In addition, when the optocoupler isolation module of the power supply circuit is not connected to the charging gun, the switch module remains turned off under the control of the second power signal, and the power supply cannot supply power to the module to be powered through the switch module. That is, when the power supply circuit is not connected to the charging gun, it will not supply power to the module to be powered, and thus will not affect other power supply circuits.

[0041] In one or more embodiments, reference Figure 3 As shown, the optocoupler isolation module 11 includes a current limiting submodule 111 and a photocoupler 112; the input end of the current limiting submodule 111 is used to be electrically connected to the charging gun, and the output end of the current limiting submodule 111, the photocoupler 112 and the control end of the switch module are electrically connected in sequence.

[0042] The specific structure of the current limiting submodule is not limited, as long as the current limiting function can be achieved. Setting the current limiting submodule can better control and protect the photoelectric coupler. For example, the current limiting submodule may include at least one current limiting resistor. In order to further simplify the structure and reduce the cost, refer to Figure 3 As shown, the current limiting submodule 111 may include a current limiting resistor R8, and the specific resistance value may be determined according to the photoelectric coupler and the first control signal received by the input terminal. Figure 3 In the structure shown, the resistance range of R8 can be 1KΩ-40KΩ, and the resistance of R8 can be 1KΩ, 5KΩ, 10KΩ, 20KΩ, 30KΩ or 40KΩ, etc.

[0043] The above-mentioned photoelectric coupler is an electric-optical-electrical conversion device that transmits electric signals using light as a medium. Figure 3 As shown, the photocoupler 112 may include a light source 1121 and a light receiver 1122. The light source and the light receiver may be integrated or separately provided, which is not limited here. The specific types of the light source and the light receiver are not limited here. For example, refer to Figure 3 As shown, the light source 1121 may include a light emitting diode, etc.; the light receiver may include a photosensitive diode, or Figure 3 The light-emitting diode and the phototransistor can be integrated to form a photocoupler. Figure 3 As shown, one end of the phototransistor is used to output the second control signal (i.e. Figure 3 The other end is connected to ground.

[0044] refer to Figure 3 As shown, the optocoupler isolation module 11 also includes a ground terminal GND_ISO and a discharge submodule 113, and the photocoupler 112 includes a light source 1121 and a light receiver 1122; the discharge submodule 113 and the light source 1121 are arranged in parallel between the output end of the current limiting submodule 111 and the ground terminal GND_ISO, and the light receiver 1122 is electrically connected to the control end of the switch module; the discharge submodule 113 is used to discharge the residual power of the light source 1121 when the optocoupler isolation module is not electrically connected to the charging gun.

[0045] The specific structure of the discharge submodule is not limited. For example, the discharge submodule may include at least one discharge resistor. Figure 3 As shown, the discharge submodule 113 may include a discharge resistor R9. The resistance value of the discharge resistor R9 should not be too small. On the one hand, it can avoid the discharge time being too long. On the other hand, it can avoid reducing the shunt to the photocoupler when the optocoupler isolation module is electrically connected to the charging gun, thereby improving the efficiency of the photocoupler. At the same time, the resistance value of the discharge resistor R9 should not be too large, so as to avoid the input current of the optocoupler isolator being too small to affect its conversion efficiency when the optocoupler isolation module is electrically connected to the charging gun. The specific resistance value of the discharge resistor R9 needs to be determined comprehensively based on the current limiting resistor, the optocoupler and the first control signal received at the input end. For example, Figure 3 In the structure shown, the resistance range of R9 can be 0.5R8-1MΩ, and the resistance of R9 can be 0.5KΩ, 2.5KΩ, 5KΩ, 10KΩ, 20KΩ, 40KΩ, 60KΩ, 80KΩ, 100KΩ or 120KΩ, etc. Figure 3 In the figure, the resistance value of R8 is 10KΩ and the resistance value of R9 is 100KΩ.

[0046] refer to Figure 3 As shown, the optical coupling isolation module 11 may further include a diode D2, the anode of the diode D2 is used to connect to the charging gun to receive the first control signal output by the charging gun (ie Figure 3 The cathode of the diode D2 is electrically connected to one end of the current limiting resistor R8. The first control signal (i.e. Figure 3 The CP signal shown in the figure is generally a 12V DC signal. If an abnormality occurs, the signal may become a -12V DC signal. At this time, the light-emitting diode of the photocoupler is very likely to have a reverse breakdown problem, resulting in damage. Therefore, diode D2 is set to avoid such problems. Diode D2 can well protect the light-emitting diode of the photocoupler and prevent it from having a reverse breakdown problem.

[0047] It should be noted that Figure 3 The ground terminal GND_ISO and the ground terminal GND represent ground terminals of different areas.

[0048] In one or more embodiments, reference Figure 4 As shown, the switch module 12 includes a first control submodule 121, a second control submodule 122 and a switch submodule 123 which are electrically connected in sequence.

[0049] refer to Figure 4 As shown, the control end of the first control submodule 121 is electrically connected to the optical coupling isolation module 11, and the input end of the first control submodule 121 is used to receive the second power supply signal ( Figure 4 The output end of the first control submodule 121 is electrically connected to the control end of the second control submodule 122, the output end of the second control submodule 122 is grounded, and the input end of the second control submodule 122 is electrically connected to the control end of the switch submodule 123; the input end of the switch submodule 123 is used to be electrically connected to the power supply 2, and the output end of the switch submodule 123 is used to be electrically connected to the module to be powered.

[0050] refer to Figure 4 As shown, the first control submodule 121 is used for, when the optical coupling isolation module is electrically connected to the charging gun, Figure 4 +3.3V signal shown) and the second control signal ( Figure 4 The switch submodule 123 is used to remain turned on when the second control submodule 122 is turned on, and outputs a third control signal to the second control submodule 122; the second control submodule 122 is used to remain turned on under the control of the third control signal; the switch submodule 123 is used to remain turned on when the second control submodule 122 is turned on, and outputs a third control signal to the second control submodule 122; Figure 4 The B+ signal shown) is converted into a third power signal ( Figure 4 The B+_OUT signal shown in FIG. 10A ) and outputs a third power signal ( Figure 4 B+_OUT signal shown).

[0051] refer to Figure 4 As shown, the first control submodule 121 is also used for, when the optical coupling isolation module is not electrically connected to the charging gun, Figure 4 The second control submodule 122 is also used to remain turned off when the first control submodule 121 is turned off; the switch submodule 123 is also used to remain turned off when the second control submodule 122 is turned off.

[0052] The input terminal of the first control submodule can be used as the power supply terminal of the switch module to receive the second power supply signal ( Figure 4The first control submodule can be connected to the Figure 1 The first voltage conversion module 13 shown is connected to the power supply 2. The first voltage conversion module 13 can convert the first power supply signal output by the power supply 1 into a second power supply signal, and output it to the input end of the first control submodule. Of course, the input end of the first control submodule can also obtain the second power supply signal from other power supply devices, which is not limited here.

[0053] The output end of the switch submodule can be used as the output end of the switch module. According to the power supply voltage required by the module to be powered, if the voltage of the third power supply signal output by the output end of the switch submodule is within the power supply voltage range, the output end of the switch submodule can be directly electrically connected to the module to be charged. If the voltage of the third power supply signal output by the output end of the switch submodule is not within the power supply voltage range, the output end of the switch submodule can be electrically connected to the module to be charged. Figure 1 The second voltage conversion module 14 shown is electrically connected to the module to be powered 3 , and the second voltage conversion module 14 can convert the third power supply signal into a power supply signal that meets the power supply requirement, thereby supplying power to the module to be powered 3 .

[0054] The specific structures of the above-mentioned first control submodule, second control submodule and switch submodule are not limited. In the power supply circuit, when the optocoupler isolation module is electrically connected to the charging gun, the first control submodule remains on, thereby controlling the second control submodule to remain on, thereby controlling the switch submodule to remain on, so as to convert the received first power signal into a third power signal, and output the third power signal to the module to be powered. When the optocoupler isolation module is not electrically connected to the charging gun, the first control submodule remains off, thereby controlling the second control submodule to remain off, thereby controlling the switch submodule to remain off, and the power supply cannot be supplied to the module to be powered through the switch module.

[0055] refer to Figure 1 and Figure 2 As shown, the power supply circuit 1 also includes a first voltage conversion module 13 and a second voltage conversion module 14; in the above-mentioned switch module, the input end of the first control submodule is electrically connected to the first voltage conversion module, and the output end of the switch submodule is electrically connected to the module to be powered through the second voltage conversion module.

[0056] refer to Figure 1 , 2 As shown in FIG. 4 , the first voltage conversion module 13 is used to be electrically connected to the power supply 2 to convert the first power signal ( Figure 2 The B+ signal shown) is converted into a second power signal ( Figure 2 +3.3V signal shown), the second power signal ( Figure 2The +3.3V signal shown in the figure) is transmitted to the input end of the first control submodule 121. Through the first voltage conversion module, the first power signal output by the power supply can be converted into a second power signal, without the need to set up other power supply devices, which can simplify the structure and further save costs.

[0057] refer to Figure 1 , 2 As shown in FIG. 4 , the second voltage conversion module 14 is used to convert the third power signal ( Figure 2 B+_OUT) is converted into a power supply signal ( Figure 2 V33 shown), the power supply signal ( Figure 2 The V33 shown in the figure is transmitted to the module to be powered 3; when the optical coupling isolation module is not electrically connected to the charging gun, the module to be powered is not charged. The second voltage conversion module can convert the third power supply signal into a power supply signal that meets the requirements, thereby improving the compatibility of the charging circuit and the module to be powered. The second voltage conversion module can include at least one DCDC conversion unit, refer to Figure 2 As shown, the second voltage conversion module 14 includes three DCDC converters connected in series. Through the three DCDC converters connected in series, the third power supply signal B+_OUT can be converted into a DC12V signal, and then the DC12V signal is converted into a DC5V signal, and finally the DC5V signal is converted into a V33 signal, and the V33 signal is transmitted to the VCC terminal of the MCU (Microcontroller Unit).

[0058] The following is a circuit structure of a switch module. Figure 4 As shown, the first control submodule 121 includes a first PMOS transistor Q1 and a first resistor R1; the second control submodule 122 includes an NMOS transistor Q2 and a second resistor R2; and the switch submodule 123 includes a second PMOS transistor Q3.

[0059] Among them, reference Figure 4As shown, one end of the first resistor R1 and the source S of the first PMOS tube Q1 are respectively electrically connected to the first voltage conversion module to receive the second power supply signal; the other end of the first resistor R1 and the gate G of the first PMOS tube Q1 are respectively electrically connected to the optocoupler isolation module to receive the second control signal when the optocoupler isolation module is electrically connected to the charging gun; the drain D of the first PMOS tube Q1 is electrically connected to the gate G of the NMOS tube Q2, the source S of the NMOS tube Q2 is grounded, the drain D of the NMOS tube Q2 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is electrically connected to the gate G of the second PMOS tube Q3, the source S of the second PMOS tube Q3 is used to be electrically connected to the power supply, and the drain D of the second PMOS tube Q3 is electrically connected to the second voltage conversion module to output the third power supply signal.

[0060] refer to Figure 4 As shown, when the optocoupler isolation module is not electrically connected to the charging gun, by setting the first resistor R1, the gate G of the first PMOS tube Q1 can always be at a high level, thereby preventing the gate G of the first PMOS tube Q1 from being in a floating state and avoiding the first PMOS tube Q1 from being turned on by mistake. The resistance value of the first resistor R1 is not limited and can be selected according to the structure of the first PMOS tube Q1. For example, Figure 4 In the structure shown, the resistance range of the first resistor R1 is 100KΩ-10MΩ, and the resistance of R1 can be 100KΩ, 500KΩ, 800KΩ, 1MΩ, 5MΩ or 10MΩ, etc. Figure 4 The resistance of the first resistor R1 is taken as 1 MΩ as an example.

[0061] The second resistor R2 can play a role in voltage division and current limiting to protect the NMOS transistor Q2. The resistance value of the second resistor R2 is not specifically limited, but is used as an example. Figure 4 The resistance of the second resistor R2 is taken as 2.7 MΩ for example.

[0062] refer to Figure 4 As shown, the switch submodule 123 also includes a voltage regulator tube D1 and a third resistor R3; the voltage regulator tube D1 and the third resistor R3 are arranged in parallel between the source S of the second PMOS tube Q3 and the drain D of the second PMOS tube Q3. The voltage regulator tube D1 can provide a safe and stable turn-on voltage value to the second PMOS tube. The third resistor R3 can further play a role in voltage division and current limiting to protect the NMOS tube Q2. The resistance range of the third resistor R3 is 100KΩ-10MΩ, and the resistance of R3 can be 100KΩ, 500KΩ, 800KΩ, 1MΩ, 5MΩ or 10MΩ, etc. Figure 4The resistance of the third resistor R3 is 1 MΩ. The resistance of the second resistor R2 needs to be determined according to the third resistor R3. For example, the resistance of the second resistor R2 can be 2.7 times the resistance of the third resistor R3.

[0063] refer to Figure 4 As shown, the second control submodule 122 may also include a protection resistor R7, one end of the protection resistor R7 is electrically connected to the gate G of the NMOS tube Q2, and the other end is grounded. By setting the protection resistor R7, when the first PMOS tube Q1 is not turned on, the gate G of the NMOS tube Q2 can be ensured to be at a low level potential to prevent the gate G of the NMOS tube Q2 from being in a floating state. The resistance range of the protection resistor R7 is 100KΩ-10MΩ, and the resistance of R7 can be 100KΩ, 500KΩ, 800KΩ, 1MΩ, 5MΩ or 10MΩ, etc. Figure 4 The protection resistor R7 is illustrated as having a resistance of 100KΩ.

[0064] According to the characteristics of MOS tubes, MOS tubes can be divided into NMOS (Negative-channel Metal Oxide Semiconductor, N-type metal oxide semiconductor) tubes and PMOS (Positive-channel Metal Oxide Semiconductor, P-type metal oxide semiconductor) tubes. Both MOS tubes include a gate, a source and a drain. In the above-mentioned switch module, Q1 and Q3 are PMOS tubes, and Q2 is an NMOS tube. Those skilled in the art can easily think of setting Q1 and Q3 as NMOS tubes and Q2 as a switch module circuit structure diagram corresponding to a PMOS tube without making creative work, so this type of structure is also within the protection scope of the embodiments of the present application.

[0065] Figure 4In the switch module shown, when the optocoupler isolation module is electrically connected to the charging gun, the optocoupler isolation module outputs a low-level signal WK, the gate G of the first PMOS tube Q1 is connected to the low-level signal WK, and the source is connected to the high-level +3.3V signal, then the first PMOS tube Q1 is turned on, and the first PMOS tube Q1 outputs a high-level signal, thereby pulling up the voltage of the gate G of the NMOS tube Q2, and the source S of the NMOS tube Q2 is grounded, then the NMOS tube Q2 is turned on, so that the voltage of the drain D of the NMOS tube Q2 is pulled down, and the gate G of the second PMOS tube Q3 is pulled down, the second PMOS tube Q3 is turned on, and the first power signal B+ output by the power supply is converted into a third power signal B+_OUT after passing through the second PMOS tube Q3; the third power signal B+_OUT can be converted into a stable power supply signal V33 through the second voltage conversion module, thereby supplying power to the module to be powered. When the optocoupler isolation module is not electrically connected to the charging gun, the optocoupler isolation module does not work, and the gate G of the first PMOS tube Q1 is controlled by the high-level +3.3V signal to maintain a high level. Therefore, the first PMOS tube Q1 is turned off, and its drain cannot output a high-level signal, so that the NMOS tube Q2 is also turned off, and the gate of the second PMOS tube Q3 is at a high level, then the second PMOS tube Q3 is also turned off, and the first power signal B+ output by the power supply cannot be transmitted to the module to be powered through the second PMOS tube Q3. That is, when the optocoupler isolation module is not electrically connected to the charging gun, the power supply does not supply power to the module to be powered.

[0066] The present application also provides an electronic device, referring to Figure 1 As shown, it includes: a power supply 2, a module to be powered 3 and the above-mentioned power supply circuit 1; the power supply 2, the power supply circuit 1 and the module to be powered 3 are electrically connected in sequence.

[0067] The module to be powered can be a chip such as a microcontroller unit (MCU), an ARM (Advanced RISC Machines) or an FPGA (Field Programmable Gate Array); of course, it can also be other devices or structures that need power supply.

[0068] The type of the electronic device is not limited, and the electronic device can be a component or product used in fields such as smart housing, transportation, smart home, consumer electronics, monitoring, industrial automation, in-cabin detection, and health care. For example, the electronic device can be an energy storage device, the power supply circuit belongs to the BMS (Battery Management System) in the energy storage device, and the module to be powered can be an MCU chip of the BMS system.

[0069] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present application, and in practical applications, various changes may be made to the embodiments in form and detail without departing from the spirit and scope of the present application. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application, and therefore the scope of protection of the present application shall be subject to the scope defined in the claims.

Claims

1. A power supply circuit, characterized in that: include: An optical coupling isolation module and a switch module; wherein the input end of the switch module is used to receive a first power supply signal output by a power supply; the output end of the switch module is used to be electrically connected to a module to be powered; the power supply end of the switch module is used to receive a second power supply signal; and the control end of the switch module is electrically connected to the optical coupling isolation module; The optical coupling isolation module is used to convert the first control signal output by the charging gun into a second control signal when electrically connected to the charging gun, and transmit the second control signal to the control end of the switch module; The switch module is used to remain turned on under the control of the second power signal and the second control signal when the optocoupler isolation module is electrically connected to the charging gun, convert the first power signal into a third power signal, and output the third power signal; and remain turned off under the control of the second power signal when the optocoupler isolation module is not electrically connected to the charging gun.

2. The power supply circuit according to claim 1, characterized in that: The optocoupler isolation module includes a current limiting submodule and a photoelectric coupler; the input end of the current limiting submodule is used to be electrically connected to the charging gun, and the output end of the current limiting submodule, the photoelectric coupler and the control end of the switch module are electrically connected in sequence.

3. The power supply circuit according to claim 2, characterized in that: The current limiting submodule includes at least one current limiting resistor.

4. The power supply circuit according to claim 2, characterized in that: The optical coupling isolation module also includes a ground terminal and a discharge submodule, and the photoelectric coupler includes a light source and a light receiver; The discharge submodule and the light source are arranged in parallel between the output end of the current limiting submodule and the ground end, and the light receiver is electrically connected to the control end of the switch module; The discharge submodule is used to discharge the residual power of the light source when the optical coupling isolation module is not electrically connected to the charging gun.

5. The power supply circuit according to claim 4, characterized in that: The discharge submodule includes at least one discharge resistor.

6. The power supply circuit according to any one of claims 1 to 5, characterized in that: The switch module comprises a first control submodule, a second control submodule and a switch submodule which are electrically connected in sequence; The control end of the first control submodule is electrically connected to the optical coupling isolation module, the input end of the first control submodule is used to receive the first power supply signal, the output end of the first control submodule is electrically connected to the control end of the second control submodule, the output end of the second control submodule is grounded, and the input end of the second control submodule is electrically connected to the control end of the switch submodule; the input end of the switch submodule is used to be electrically connected to the power supply, and the output end of the switch submodule is used to be electrically connected to the module to be powered; The first control submodule is used to keep conducting under the control of the second power signal and the second control signal when the optical coupling isolation module is electrically connected to the charging gun, and output a third control signal to the second control submodule; the second control submodule is used to keep conducting under the control of the third control signal; the switch submodule is used to keep conducting when the second control submodule is turned on, convert the received first power signal into the third power signal, and output the third power signal; The first control submodule is also used to remain turned off under the control of the second power supply signal when the optocoupler isolation module is not electrically connected to the charging gun; the second control submodule is also used to remain turned off when the first control submodule is turned off; the switch submodule is also used to remain turned off when the second control submodule is turned off.

7. The power supply circuit according to claim 6, characterized in that: The power supply circuit further includes a first voltage conversion module and a second voltage conversion module; the input end of the first control submodule is electrically connected to the first voltage conversion module, and the output end of the switch submodule is electrically connected to the module to be powered via the second voltage conversion module; The first voltage conversion module is used to be electrically connected to the power supply, convert the first power signal output by the power supply into a second power signal, and transmit the second power signal to the input end of the first control submodule; The second voltage conversion module is used for converting the third power signal into a power supply signal when the optical coupling isolation module is electrically connected to the charging gun, and transmitting the power supply signal to the module to be powered; When the optical coupling isolation module is not electrically connected to the charging gun, the module to be powered is not charged.

8. The power supply circuit according to claim 7, characterized in that: The first control submodule includes a first PMOS tube and a first resistor; the second control submodule includes an NMOS tube and a second resistor; the switch submodule includes a second PMOS tube; Among them, one end of the first resistor and the source of the first PMOS tube are respectively electrically connected to the first voltage conversion module, the other end of the first resistor and the gate of the first PMOS tube are respectively electrically connected to the optocoupler isolation module, the drain of the first PMOS tube is electrically connected to the gate of the NMOS tube, the source of the NMOS tube is grounded, the drain of the NMOS tube is electrically connected to one end of the second resistor, the other end of the second resistor is electrically connected to the gate of the second PMOS tube, the source of the second PMOS tube is used to be electrically connected to the power supply, and the drain of the second PMOS tube is electrically connected to the second voltage conversion module.

9. The power supply circuit according to claim 8, characterized in that: The switch submodule further includes a voltage regulator tube and a third resistor; the voltage regulator tube and the third resistor are arranged in parallel between the source of the second PMOS tube and the drain of the second PMOS tube.

10. An electronic device, characterized in that: include: A power supply, a module to be powered, and a power supply circuit according to any one of claims 1 to 9; The power supply, the power supply circuit and the module to be powered are electrically connected in sequence.

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