Charging circuit and vehicle-mounted charger

Abstract

The utility model discloses a charging circuit and a vehicle-mounted charger, through arranging a plurality of voltage regulation modules, a plurality of different devices to be charged can be charged, and a control module can distribute the total output power of the charging circuit to the plurality of voltage regulation modules. According to the charging circuit, the circuit total output power which can be provided by the charging circuit can be fully utilized, efficient and rapid charging can be provided for multiple paths of to-be-charged equipment, meanwhile, the lighting module is further configured in the charging circuit and can light the charging ports, the multiple charging ports are convenient to observe and use, and charging convenience is provided for a user.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field especially, relate to a charging circuit and vehicle charger. BACKGROUND

[0002] With the popularization and diversification of electronic equipment, people's demand for charging equipment is also growing, and the traditional charging circuit often adopts single voltage output, which is poor in versatility and cannot meet the simultaneous charging needs of different electronic equipment, resulting in low charging efficiency and safety hazards. At the same time, in the dark environment, the user is difficult to accurately find the charging port, which brings inconvenience to the charging process. SUMMARY

[0003] The utility model discloses a charging circuit and vehicle charger can effectively charging efficiency, improve the convenience of charging.

[0004] In the first aspect, the utility model discloses a charging circuit, including: power input module, voltage regulation module, lighting module and control module, wherein power input module is used to access external power supply, voltage regulation module sets up multiple, each voltage regulation module is connected with power input module respectively, and each voltage regulation module includes the charging port for supplying power to the equipment to be charged, lighting module is connected with power input module and is used for lighting charging port, control module is connected voltage regulation module and lighting module respectively to adjust the output power of each voltage regulation module to the equipment to be charged.

[0005] The charging circuit provided by the utility model has at least the following beneficial effects: by setting multiple voltage regulation modules, the charging of multiple different equipment to be charged can be carried out, and the control module can distribute the total output power of the charging circuit to the multiple voltage regulation modules, so that the total output power of the charging circuit can be fully utilized to provide efficient and rapid charging for multiple equipment to be charged, and the lighting module is also configured in the charging circuit, which can also illuminate the charging port, so that the multiple charging ports can be observed and used conveniently, and the user is provided with charging convenience.

[0006] In the charging circuit provided by the utility model, the voltage regulation module includes a boost-buck unit and a protocol communication unit, the power input module is connected with the protocol communication unit through the boost-buck unit, the protocol communication unit is connected with the charging port, and the control module is connected with the boost-buck unit and the protocol communication unit.

[0007] In the charging circuit provided by the embodiment of the utility model, the voltage-lifting and voltage-lowering unit comprises a power supply adjusting unit, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first inductor, a first capacitor connected with the power supply input module, and a second capacitor connected with the protocol communication unit, one end of the first capacitor is connected with the conduction current inflow end of the first switch tube, the conduction current outflow end of the first switch tube is simultaneously connected with the conduction current inflow end of the second switch tube and one end of the first inductor, the other end of the first inductor is simultaneously connected with the conduction current inflow end of the third switch tube and the conduction current outflow end of the fourth switch tube, the conduction current inflow end of the fourth switch tube is connected with one end of the second capacitor, the other end of the first capacitor, the conduction current outflow end of the second switch tube, the conduction current outflow end of the third switch tube and the other end of the second capacitor are simultaneously grounded, and the control ends of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are respectively connected with the power supply adjusting unit.

[0008] In the charging circuit provided by the embodiment of the utility model, the voltage-lifting and voltage-lowering unit further comprises a first filter branch, and the connection points of the conduction current inflow end of the second switch tube and the first inductor and the connection points of the conduction current inflow end of the third switch tube and the first inductor are all connected with the first filter branch.

[0009] In the charging circuit provided by the embodiment of the utility model, the first filter branch comprises a filter capacitor and a filter resistor connected in sequence, and one end of the filter resistor is grounded.

[0010] In the charging circuit provided by the embodiment of the utility model, diodes are connected in parallel between each control end in the first switch tube, the second switch tube, the third switch tube and the fourth switch tube and the power supply adjusting unit.

[0011] In the charging circuit provided by the embodiment of the utility model, the lighting module comprises a constant current driving unit and a lighting lamp group, the power supply input end of the constant current driving unit is connected with the power supply input module, the dimming end of the constant current driving unit is connected with the control module, a sampling resistor is arranged between the detection end and the power supply input end of the constant current driving unit, the freewheeling inductor for being connected to the lighting lamp group is connected to the power switch end of the constant current driving unit, and the output end of the constant current driving unit is connected with the freewheeling diode between the power supply input end.

[0012] In the charging circuit provided by the embodiment of the utility model, the lighting module further comprises a first resistor, the freewheeling inductor is connected with the output end of the lighting lamp group through the first resistor, and the input end of the lighting lamp group is connected to the connection point of the detection end and the sampling resistor.

[0013] In the charging circuit provided by the embodiment of the utility model, the control module comprises a trigger button for switching the on-off state of the lighting module, and a memory for storing the on-off state of the lighting module, and the trigger button is connected with the memory.

[0014] In the second aspect, the utility model provides a vehicle charger, comprising the charging circuit as described in the above embodiment, the vehicle charger further comprises a shell and a plurality of telescopic charging lines, the shell is provided with a power interface for connecting external power supply, the power input module, the voltage regulating module, the lighting module and the control module are installed in the shell, the power input module is connected with the power interface, and each charging port is connected with each telescopic charging line one by one.

[0015] The vehicle charger provided by the embodiment of the utility model has at least the following beneficial effects: by arranging a plurality of voltage regulating modules, a plurality of different devices to be charged can be charged, the control module can distribute the total output power of the charging circuit to the plurality of voltage regulating modules, the total output power of the charging circuit can be fully utilized, efficient and rapid charging is provided for the plurality of devices to be charged, and the lighting module is further arranged in the charging circuit, the charging port can be illuminated by the lighting module in a dark environment, the plurality of charging ports can be observed and used conveniently, the interior light source does not need to be turned on during driving, the interior light source does not affect the driver's sight, and convenience is provided for users.

[0016] Other features and advantages of the utility model will be set forth in the subsequent description, and partially become obvious from the description, or be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structure specially pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings are used to provide further understanding of the technical scheme of the utility model, and constitute a part of the description, and are used to explain the technical scheme of the utility model together with the embodiments of the utility model, and do not constitute the limitation to the technical scheme of the utility model.

[0018] The utility model will be further explained in combination with the drawings and embodiments;

[0019] Figure 1 It is the structural schematic diagram of the charging circuit provided by the embodiment of the utility model;

[0020] Figure 2 It is the specific circuit schematic diagram of the voltage regulating module provided by the embodiment of the utility model;

[0021] Figure 3 is an equivalent circuit schematic diagram of a boost-buck regulation unit provided by an embodiment of the utility model;

[0022] Figure 4 is a specific circuit schematic diagram of a lighting module provided by an embodiment of the utility model;

[0023] Figure 5 is a specific circuit schematic diagram of a control module provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0024] This part will describe the specific embodiments of the utility model in detail, and the preferred embodiments of the utility model are shown in the drawings, and the drawings serve to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0025] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number, "any one" means one or more, "at least one of the following" and similar expressions mean any combination of these items, including single or multiple items. If the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.

[0026] It should be noted that the terms such as setting, installing and connecting in the embodiments of the utility model should be understood broadly, and the skilled in the art can determine the specific meaning of the above terms in the embodiments of the utility model in combination with the specific content of the technical scheme. For example, the term "connection" can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium.

[0027] It should be noted that the technical features involved in each embodiment of the utility model described below can be combined with each other as long as there is no conflict between them.

[0028] With the popularity and diversification of electronic devices, people's demand for charging devices is also increasing, and traditional charging circuits often adopt single-voltage output, which has poor universality and cannot adapt to the simultaneous charging needs of different electronic devices, resulting in low charging efficiency and safety hazards. At the same time, in a dark environment, users have difficulty in accurately finding the charging port, which brings inconvenience to the charging process.

[0029] Based on this, the utility model discloses a charging circuit and vehicle charger, through setting up multiple voltage regulation module, can be charged for multiple different to be charged equipment, and control module can distribute the circuit total output power of charging circuit to multiple voltage regulation module, can make full use of the circuit total output power that charging circuit can provide, provides high -efficient fast charging for multiple to be charged equipment, simultaneously, still be equipped with illumination module in charging circuit, and illumination module can also illuminate charging port, and the multiple charging ports are convenient for observation and use, provide charging convenience for the user.

[0030] The utility model embodiment is further described below with reference to the drawings.

[0031] Reference Figure 1 The utility model discloses a charging circuit. The charging circuit includes a power input module, a voltage regulation module, an illumination module, and a control module. The power input module is used to connect to an external power source. The power input module can be provided with a standard power interface, such as an AC / DC power adapter interface, which can receive power from the external power source and transmit it to the subsequent circuit for processing. Specifically, the power input module can adjust the power interface according to the actual use scenario of the charging circuit. For example, the charging circuit can be applied to a vehicle charger. Therefore, the power input module can include a negative conductive spring installed on the outer side wall of the vehicle charger shell and a positive conductive contact installed on the bottom of the vehicle charger shell. The power input module can draw power from the vehicle battery through the negative conductive spring and the positive conductive contact.

[0032] The voltage regulation module is provided with multiple voltage regulation modules, each of which is connected to the output end of the power input module, thereby converting the power input from the power input module into voltage and current suitable for the to-be-charged equipment, and then supplying power to the to-be-charged equipment connected to the charging port through the charging port. It is worth noting that each voltage regulation module includes a charging port, which can be customized according to the type, brand, or model of the to-be-charged equipment. For example, the charging port can include a USB interface and a Type-C interface. In addition, the charging port can be connected to the to-be-charged equipment through a power line. Specifically, the voltage regulation module can be integrated with a voltage regulation circuit and a current detection circuit, which can monitor the voltage and current output by the voltage regulation module in real time and dynamically adjust in response to the control of the control module to ensure the safety and efficiency of the charging process.

[0033] The lighting module can include a LED light group or other types of lighting elements, and can be arranged near the periphery of the charging port. When the power input module is connected to an external power source, the lighting module can be turned on to provide sufficient light for the charging port, so that the user can easily find the charging port and plug in the device to be charged in a dark environment. The lighting module can also include a voltage regulation circuit to adjust the supply voltage of all lighting elements, thereby adjusting the brightness and color of the lighting module.

[0034] The control module is connected to the voltage regulation module and the lighting module, respectively, and is responsible for the control and adjustment of the charging circuit. The control module can adjust the output power of the voltage regulation module according to the current and / or voltage collected by each voltage regulation module, to meet the charging needs of the device to be charged while ensuring that the charging circuit outputs at the maximum output power (i.e., the total output power of the circuit). For example, when only one device to be charged is connected to one charging port, the control module can adjust the voltage regulation module connected to the device to be charged to supply power at the maximum output power (e.g., the total output power of the circuit is 100W). When two devices to be charged are connected to the charging port, the control module can distribute the total output power of the circuit 100W to the corresponding voltage regulation module, such as each voltage regulation module outputs 20V / 2.5A through the charging port, to meet the maximum output power of the charging circuit 100W. Alternatively, the control module can identify the power requirement of the device to be charged through the fast charging protocol (Power Delivery, PD), and adjust the output power of the voltage regulation module according to the power requirement of the device to be charged.

[0035] Therefore, by integrating the power input module, the lighting module, the control module and the plurality of voltage regulation modules, the plurality of different devices to be charged can be charged by the plurality of voltage regulation modules, and the control module can distribute the total output power of the charging circuit to the plurality of voltage regulation modules, thereby fully utilizing the total output power of the charging circuit to provide efficient and fast charging for multiple devices to be charged. At the same time, the lighting module can also illuminate the charging port in a dark environment, making it easy to observe and use multiple charging ports, and providing convenience for users.

[0036] Reference Figure 2 , Figure 2is the specific circuit schematic diagram of the voltage regulation module provided by the embodiment of the utility model, can see, voltage regulation module can include has the voltage increasing and reducing unit and protocol communication unit, the output end of power input module is connected with voltage increasing and reducing unit, voltage increasing and reducing unit can be based on the adjustment of control module and convert the input voltage provided by power input module to the voltage required by the device to be charged, again supply the power after voltage regulation to the device to be charged through protocol communication unit and charging port, wherein, protocol communication unit can be configured with fast charging protocol, and through the data interaction of charging port and the device to be charged, again through the IIC port of protocol communication unit, such as Figure 2 The SCK pin of the protocol communication unit (such as fast charging protocol chip) shown in the figure, data transmission is carried out with the control module, and the data interaction between the device to be charged and the control module is realized.Specifically, the protocol communication unit can communicate with the device to be charged through the fast charging protocol, confirm the power parameters required by the device to be charged, and then communicate with the control module through the IIC port, transmit data to the control module, so that when the connected device to be charged changes (such as other charging ports access new device to be charged or the power demand of the device to be charged being connected changes), the control module can automatically adjust the power distribution on each output to meet the power demand of all connected devices to be charged while ensuring the maximum output power of the circuit, improve the charging efficiency and safety.

[0037] In combination with Figure 2 And Figure 3 , Figure 3It is the equivalent circuit schematic view of the step-up and step-down regulating unit provided by the utility model embodiment, can see, the step-up and step-down unit includes power regulating unit, first switch tube Q1, second switch tube Q2, third switch tube Q3, fourth switch tube Q4, first inductance L1, first capacitor Ci and second capacitor Co. Among them, first switch tube Q1, second switch tube Q2, third switch tube Q3 and fourth switch tube Q4 can be metal-oxide semiconductor field effect transistor (that is, MOS tube based on gallium nitride) containing gallium nitride material. The two ends of first capacitor Ci are connected with power input module to obtain input power supply, and the two ends of second capacitor Co are connected with protocol communication unit to provide voltage-regulated power supply to protocol communication unit. Power regulating unit is connected with all control ends (gate end G) in first switch tube Q1, second switch tube Q2, third switch tube Q3 and fourth switch tube Q4 respectively, one end of first capacitor Ci is connected with the conduction current inflow end (drain end D) of first switch tube Q1, and the conduction current outflow end (source end S) of first switch tube Q1 is connected with the conduction current inflow end (drain end D) of second switch tube Q2 and the conduction current outflow end (source end S) of fourth switch tube Q4 respectively.The fourth switch tube Q4 current flowing out end (source end S) is connected with one end of the second capacitor Co, and the other end of the first capacitor Ci, the other end of the second capacitor Co, the second switch tube Q2 current flowing out end (source end S) and the third switch tube Q3 current flowing out end (source end S) are grounded at the same time, at this time, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the first inductor L1, the first capacitor Ci and the second capacitor Co constitute a four switch tube buck-boost circuit, when the input voltage provided by the power input module is higher than the required voltage of the device to be charged, for example, the PDO (Power Delivery Object) gear of the device to be charged is obtained through the protocol communication chip communication, and the input voltage provided by the power input module is 12V, at this time, the buck-boost circuit operates in the buck state, in the buck state of the buck-boost circuit, the first switch tube Q1 and the second switch tube Q2 are alternately turned on, the third switch tube Q3 is turned off, and the fourth switch tube Q4 is continuously turned on, at this time, the input voltage of the buck-boost voltage is higher than the output voltage, the buck regulation of the input power supply is realized, specifically, when the first switch tube Q1 is turned on and the second switch tube Q2 is turned off, the current provided by the power input module flows through the first switch tube Q1 and charges the first inductor L1, at this time, the voltage on the first inductor L1 is the output voltage of the buck-boost circuit, and when the first switch tube Q1 is turned off and the second switch tube Q2 is turned on, in order to block the disappearance of the current, the first inductor L1 generates an opposite voltage, at this time, the electrical energy stored in the first inductor L1 supplies power to the second capacitor Co in the rear stage, and then supplies power to the device to be charged in the rear stage through the second capacitor Co, by adjusting the time length of the first switch tube Q1 and the second switch tube Q2 alternately turned on, the output voltage to the rear stage can be adjusted. When the input voltage provided by the power input module is lower than the required voltage of the device to be charged, for example, the PDO gear of the device to be charged is obtained through the protocol communication chip communication, and the input voltage provided by the power input module is 12V, at this time, the buck-boost circuit operates in the boost state, in the boost state of the buck-boost circuit, the first switch tube Q1 is continuously turned on, the second switch tube Q2 is turned off, the third switch tube Q3 and the fourth switch tube Q4 are alternately turned on, when the third switch tube Q3 is turned on and the fourth switch tube Q4 is turned off, the power supply charges the first inductor L1 through the first switch tube Q1 and the third switch tube Q3, the first inductor L1 stores electrical energy, and the current flowing through the first inductor L1 gradually increases, at the same time, a counter electromotive force opposite to the input power supply voltage is formed at both ends of the first inductor L1, and when the third switch tube Q3 is turned off and the fourth switch tube Q4 is turned on, due to the fact that the current of the first inductor L1 cannot be suddenly changed, the first inductor L1 generates a self-induced electromotive force, and the self-induced electromotive force is superimposed with the input power supply voltage, so that the output voltage of the buck-boost circuit is greater than the input voltage.

[0038] As shown in Figure 3 , since the current flowing through the first inductor L1 changes when each switch tube switches on, an electromotive force is generated, which attempts to maintain the current in the first inductor L1 unchanged, but other electronic components (such as each capacitor, etc.) in the step-up / down unit will respond to this electromotive force, resulting in fluctuations in voltage and current, ringing, at the same time, each switch tube switching on and off will change the topology of the step-up / down circuit, resulting in changes in impedance on the signal transmission path, which will cause the signal to encounter changes during transmission, and thus ringing phenomenon, especially when each switch tube is in a high-frequency switching state, the ringing phenomenon will be more obvious, and in order to reduce the generation of ringing, the first filter branch is introduced in the step-up / down unit, specifically, as shown in Figure 2 , the connection point between the conduction current inflow end (drain end D) of the second switch tube Q2 and the first inductor L1 is connected with the first filter branch, and the connection point between the conduction current inflow end (drain end D) of the third switch tube Q3 and the first inductor L1 is also connected with the first filter branch; the first filter branch includes a filter capacitor and a filter resistor, wherein one end of the filter capacitor (such as the capacitor C5 shown in Figure 2 ) in one of the first filter branches is connected to the connection point between the conduction current inflow end (drain end D) of the second switch tube Q2 and the first inductor L1, and the other end is grounded through the filter resistor (such as the resistor R5 shown in Figure 2 ); one end of the filter capacitor (such as the capacitor C6 shown in Figure 2 ) in the other first filter branch is connected to the connection point between the conduction current inflow end (drain end D) of the third switch tube Q3 and the first inductor L1, and the other end is also grounded through the filter resistor (such as the resistor R6 shown in Figure 2 ).

[0039] In addition, as shown in Figure 3 , diodes D1, D2, D3, and D4 are introduced at the control end (gate end G) of each switch tube, and the control end of each switch tube is connected to the anode end of the diode and the power supply adjustment unit at the same time, and the cathode end of the diode is connected to the power supply adjustment unit through the first protection resistor, that is, the diode and the first protection resistor are connected in parallel between the control end of each switch tube and the power supply adjustment unit, which can provide a fast discharge path for the junction capacitance of each switch tube. It is worth noting that the second protection resistor (such as the resistor R7 shown in Figure 3The resistors R1, R2, R3, and R4 shown prevent the current supplied by the power conditioning unit from flowing directly into the junction capacitor. When the junction capacitor is de-energized, it is equivalent to a short circuit, which can easily burn out the power conditioning unit. When the switching transistor needs to be turned off, the voltage at the control terminal needs to drop rapidly below the threshold voltage. At this time, the voltage stored in the junction capacitor of the switching transistor can flow into the power conditioning unit through the first and second protection resistors. The parallel diode can accelerate this discharge process, enabling the switching transistor to turn off quickly, thereby improving the efficiency of the circuit.

[0040] Reference Figure 4 , Figure 4 This is a schematic diagram of the lighting module provided in an embodiment of this utility model. Figure 4 As shown, the lighting module includes a constant current drive unit and a lighting assembly. The constant current drive unit can be a step-down constant current source in continuous inductor current conduction mode. The lighting assembly can include one or more LED chips, and the LED chips can emit different colors. Specifically, the power input terminal of the constant current drive unit, as shown... Figure 4 The VIN pin of the constant current drive unit shown can be connected to the power input module. A first filter module is also connected between the power input module and the VIN pin of the constant current drive unit. The first filter module includes a first filter inductor L21 and multiple first filter capacitors connected in parallel (e.g., ...). Figure 4 As shown in capacitors C21 and C22, the power input module is connected to the VIN pin of the constant current drive unit through the first filter inductor L21. One end of each of the multiple first filter capacitors is connected to the connection point between the first filter inductor L21 and the VIN pin of the constant current drive unit, while the other end is grounded. The dimming terminal of the constant current drive unit, as shown... Figure 4 The ADJ pin of the constant current drive unit shown is connected to the control module. The ADJ pin is connected to the control module via a first resistor R21 to receive pulse modulation signals sent by the control module, thereby adjusting the voltage output to the lighting group and thus regulating the brightness of the lighting group. A pull-down resistor is also connected between the first resistor R21 and the ADJ pin to reduce interference with the pulse modulation signal. The constant current drive unit also includes a detection terminal, such as... Figure 4 The SENCE pin of the constant current drive unit shown is used to detect the current output to the lighting assembly. A sampling resistor R20 is connected between the detection terminal and the power input terminal. The detection terminal is also connected to the positive terminal of the lighting assembly, while the negative terminal of the lighting assembly is connected to the power switch terminal of the constant current drive unit through a freewheeling inductor L22. Figure 4The LX pin of the constant current driving unit is shown, and the LX pin is connected with the drain end of the power switch arranged in the constant current driving unit; a loop is formed through the detection end SENCE, the lighting lamp set, the freewheeling inductor L22 and the power switch end LX, stable constant current output is provided for the lighting lamp set, and the lighting lamp set is driven to emit light.

[0041] In addition, the lighting module further comprises a second resistor R22, the power switch end is connected to the output end of the lighting lamp set through the freewheeling inductor L22 and the second resistor R22 connected in sequence, the current of the lighting lamp set is limited through the second resistor R22 connected in sequence, and overcurrent of the lighting lamp set is prevented; meanwhile, the second resistor R22 connected in sequence can help to stabilize the output current, keep the relative stability of the current, and the second resistor R22 can also play a role in voltage division, and help to adjust the voltage across the lighting lamp set.

[0042] Referring to Figure 5 , Figure 5 is a specific circuit schematic diagram of the control module. The control module can include a trigger button SW1, and the opening and closing states of the lighting module can be switched through the trigger button SW1. The control module can be a single-chip microcomputer, and the control module can further include a memory, that is, the control module can be a single-chip microcomputer with a flash memory. The analog input end of the control module can be connected to the lighting module through a voltage detection circuit, and used to detect whether the voltage of the lighting module is lower than a conduction threshold, so as to determine whether the lighting module is disconnected, so that the analog input end can detect the on-off state of the lighting module, and the memory in the control module can record the on-off state of the lighting module detected by the analog input end. After the control module is powered on, the lighting of the lighting module can be restored based on the on-off state of the lighting module saved in the memory, and the power-down memory function of the lighting module is realized.

[0043] In a second aspect, the utility model provides a vehicle charger, including the charging circuit as described in the first aspect above, the vehicle charger still includes a plurality of telescopic charging wires and a shell, wherein the charging circuit is arranged in the shell, the shell can be equipped with the power supply interface for accessing external power supply, for example, the power supply interface can include the negative pole conductive spring installed in the lateral wall of the shell and the positive pole conductive contact installed in the bottom of the shell, and the power input module can take electricity from the vehicle battery through the power supply interface of the negative pole conductive spring and the positive pole conductive contact, and each charging port is connected with each telescopic charging wire one by one, the design of the telescopic charging wire allows the user to stretch to the appropriate length according to the demand, and it is convenient to recover after use, and the convenience of the vehicle charger is improved. In addition, the shell is also provided with a light transmission window, the illumination module can be installed in the light transmission window, or the illumination module illuminates the external environment through the light transmission window, wherein the light transmission window can be directed to the charging port, or the light transmission window can be located around the charging port, so that the illumination module can illuminate the charging port. Therefore, the vehicle charger provided by the utility model embodiment can charge a plurality of different devices to be charged by setting a plurality of voltage regulating modules, and the control module can distribute the total output power of the charging circuit to the plurality of voltage regulating modules, so that the total output power of the charging circuit can be fully utilized to provide efficient and fast charging for the plurality of devices to be charged, and the illumination module is also configured in the charging circuit, which can also illuminate the charging port, making it convenient to observe and use the plurality of charging ports, and providing charging convenience for the user.

[0044] The utility model is described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, and various changes can be made within the knowledge range of ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. A charging circuit, characterized by, The application relates to a power supply device, which comprises: a power input module for connecting to an external power supply; a plurality of voltage regulation modules, each of which is connected to the power input module and comprises a charging port for supplying power to a device to be charged; a lighting module connected to the power input module for illuminating the charging port; a control module connected to the voltage regulation modules and the lighting module for regulating the output power of each voltage regulation module to the device to be charged.

2. The charging circuit of claim 1, wherein, The voltage regulation module comprises a voltage-lifting and -lowering unit and a protocol communication unit, the power input module is connected to the protocol communication unit through the voltage-lifting and -lowering unit, the protocol communication unit is connected to the charging port, and the control module is connected to the voltage-lifting and -lowering unit and the protocol communication unit.

3. The charging circuit of claim 2, wherein, The voltage-lifting and -lowering unit comprises a power regulation unit, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first inductor, a first capacitor connected to the power input module, and a second capacitor connected to the protocol communication unit, one end of the first capacitor is connected to the conduction current inflow end of the first switch tube, the conduction current outflow end of the first switch tube is connected to the conduction current inflow end of the second switch tube and one end of the first inductor, the other end of the first inductor is connected to the conduction current inflow end of the third switch tube and the conduction current outflow end of the fourth switch tube, the conduction current inflow end of the fourth switch tube is connected to one end of the second capacitor, the other end of the first capacitor, the conduction current outflow end of the second switch tube, the conduction current outflow end of the third switch tube and the other end of the second capacitor are grounded, and the control ends of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are connected to the power regulation unit.

4. The charging circuit of claim 3, wherein, The voltage-lifting and -lowering unit further comprises a first filter branch, and the conduction current inflow end of the second switch tube and the conduction current inflow end of the third switch tube are both connected to the connection point of the first inductor.

5. The charging circuit of claim 4, wherein, The first filter branch comprises a filter capacitor and a filter resistor connected in sequence, and one end of the filter resistor is grounded.

6. The charging circuit of claim 4, wherein, Diodes are connected in parallel between each control end of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube and the power regulation unit.

7. The charging circuit of claim 1, wherein, The lighting module comprises a constant-current driving unit and a lighting lamp group, the power input end of the constant-current driving unit is connected to the power input module, the dimming end of the constant-current driving unit is connected to the control module, a sampling resistor is arranged between the detection end and the power input end of the constant-current driving unit, a freewheeling inductor for connecting to the lighting lamp group is connected to the power switch end of the constant-current driving unit, and a freewheeling diode is connected between the output end and the power input end of the constant-current driving unit.

8. The charging circuit of claim 7, wherein, The lighting module further comprises a first resistor, the freewheeling inductor is connected with the output end of the lighting lamp group through the first resistor, and the input end of the lighting lamp group is connected to the connection point of the detection end and the sampling resistor.

9. The charging circuit of claim 1, wherein, The control module comprises a trigger button for switching the on-off state of the lighting module and a memory for storing the on-off state of the lighting module, and the trigger button is connected with the memory.

10. An in-vehicle charger characterized by comprising: The vehicle-mounted charger further comprises a shell and a plurality of telescopic charging lines, the shell is provided with a power interface for accessing an external power source, the power input module, the voltage regulation module, the lighting module and the control module are installed in the shell, the power input module is connected with the power interface, and each of the charging ports is connected with one of the telescopic charging lines in a one-to-one manner.

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