CN210806803U

CN210806803U - Circuit for realizing single-port current limiting and double-port total current limiting of double-port output vehicle-mounted charger

Info

Publication number: CN210806803U
Application number: CN201922103544.1U
Authority: CN
Inventors: 郑邦升
Original assignee: Dongguan Yingju Power Supply Co ltd
Current assignee: Dongguan Yingju Power Supply Co ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-06-19
Anticipated expiration: 2029-11-29

Abstract

The utility model relates to an on-vehicle accessory technical field, specifically speaking relates to an on-vehicle charger of two port output realizes single port current-limiting and two port total current-limiting circuit, including input circuit, main control circuit, first current detection current-limiting circuit, second current detection current-limiting circuit, output total current detection return circuit, output filter circuit, instruction return circuit and identification circuit. The utility model can limit the current of two output ports to 2.4A independently, and any one output port can output 2.4A, thereby facilitating the daily use of users, and not needing to specially select which port can meet 2.4A; when two ports used simultaneously, the restriction total current is 3.6A, and two port intelligent allocation electric currents ensure that the car fills product normal work, can not lead to the potential safety hazard because of the high temperature, through realizing that on-vehicle charger output single port current-limiting and two port are always current-limiting, have ensured the performance of product. In addition, the two current limiting modes are used simultaneously, which is equivalent to double protection of the product, and the safety and reliability of the product are ensured.

Description

Circuit for realizing single-port current limiting and double-port total current limiting of double-port output vehicle-mounted charger

Technical Field

The utility model relates to an on-vehicle accessory technical field specifically is a two port output vehicle charger realizes single mouthful of current-limiting and two port total current-limiting circuit.

Background

The vehicle-mounted charger is a necessary automobile article for a vehicle clan, can supplement electric energy for digital products such as a mobile phone, a flat plate and the like in a vehicle, can also be used as a power supply interface of a driving record, and is very strong in practicability. Along with the development and progress of science and technology, the types of electronic products are more and more, the charging requirement of a vehicle owner cannot be met by the single-port USB vehicle charger, and the double-port USB vehicle charger is produced. In order to charge the ipad, the output needs to meet 5V/2.4A, the single port outputs 5V/2.A, the double port is 5V/4.8A, the total power is 24W, the total power can only reach 18W due to the limitation of vehicle charging volume, the problem of temperature is difficult to solve when the power is large, the maximum output power/current needs to be limited, and the internal elements of the product cannot be damaged due to temperature or current stress.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two port output vehicle charger realize single mouthful of current-limiting and two port total current-limiting circuit to solve among the above-mentioned background art too big too high that leads to of power, thereby make the problem of electric current stress damage.

In order to achieve the above object, the utility model provides a following technical scheme:

a circuit for realizing single-port current limiting and double-port total current limiting of a double-port output vehicle-mounted charger comprises an input circuit, a main control loop, a first current detection current limiting loop, a second current detection current limiting loop, an output total current detection loop, an output filtering loop, an indication loop and an identification circuit.

Preferably, the input circuit comprises a fuse F1 for protection, a patch capacitor C1 for filtering, an electrolytic capacitor C2 and a ring inductor L1.

Preferably, the type of the fuse is F15A/32V, the type of the C1 is 100nF/50V, the type of the C3 is 56uF/35V, and the inductance of the L1 is 45 uH.

Preferably, the main control loop comprises a control chip U1, an energy storage inductor L2 and a plurality of IC peripheral resistors and capacitors which are combined into a voltage reduction loop, and the main control loop is used for converting 12-24V DC voltage into 5V DC voltage.

Preferably, the first current detection current-limiting loop comprises an RCS1 for detecting the output current of the USB1 port and adjusting the output OCP function, the second current detection current-limiting loop comprises an RCS2 for detecting the output current of the USB2 port and adjusting the output OCP function, and the output currents of the first current detection current-limiting loop and the second current detection current-limiting loop are less than 2.4A.

Preferably, the output total current detection circuit comprises a current limiting chip U2, detection resistors R14 and R20 for detecting the output total current of the dual USB ports and adjusting the output OCP function, and a triode Q1.

Preferably, the model of the control chip U1 is GS92D2, the model of the inductor L2 is CS096125/11uH, the models of the detection resistors RCS1 and RCS2 are 40m Ω, the model of the current limiting chip U2 is AP4320B, the resistances of the detection resistors R14 and R20 are 30m Ω, and the model of the triode Q1 is MMBT 3906.

Preferably, the output filtering loop comprises a solid-state capacitor C12 for output filtering, and the solid-state capacitor C12 is 330 uF/6.3V.

Preferably, the indicating circuit comprises light emitting diodes LED1, LED2, LED3, LED4, chip resistors R7, R8, R9 and R19, the model numbers of the light emitting diodes LED1, LED2, LED3 and LED4 are BZ-ET0603UB, and the resistances of the resistors R7, R8, R9 and R19 are 330 omega.

Preferably, the identification circuit comprises an identification chip U3, a patch capacitor C10 and a patch resistor R11, the identification circuit is used for identifying the charging equipment, the model of the identification chip U3 is UC2634, the model of the patch capacitor C10 is 100nF/50V, and the resistance of the patch resistor R11 is 1K omega.

Compared with the prior art, the beneficial effects of the utility model are that: the double-port output vehicle-mounted charger realizes that the single-port current limiting circuit and the double-port total current limiting circuit can independently limit the current of two output ports to be 2.4A, and any one output port can output 2.4A, so that the double-port output vehicle-mounted charger is convenient for a user to use daily and does not need to specially select which port can meet the requirement of 2.4A; when two ports used simultaneously, the restriction total current is 3.6A, and two port intelligent allocation electric currents ensure that the car fills product normal work, can not lead to the potential safety hazard because of the high temperature, through realizing that on-vehicle charger output single port current-limiting and two port are always current-limiting, have ensured the performance of product. In addition, the two current limiting modes are used simultaneously, which is equivalent to double protection of the product, and the safety and reliability of the product are ensured.

Drawings

FIG. 1 is a general circuit schematic of the present invention;

FIG. 2 is a schematic block diagram of the present invention;

fig. 3 is a circuit schematic diagram of the input circuit of the present invention;

fig. 4 is a schematic circuit diagram of the main control loop of the present invention;

fig. 5 is a schematic circuit diagram of a first current-sensing current-limiting circuit of the present invention;

fig. 6 is a schematic circuit diagram of a second current-sensing current-limiting circuit of the present invention;

fig. 7 is a schematic circuit diagram of the output total current detection circuit of the present invention;

fig. 8 is a schematic circuit diagram of the indicating circuit of the present invention;

fig. 9 is a schematic circuit diagram of the identification circuit of the present invention.

Fig. 10 is a schematic circuit diagram of the output filter loop of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-10, the present invention provides the following technical solutions:

a circuit for realizing single-port current limiting and double-port total current limiting of a double-port output vehicle-mounted charger is shown in figure 1 and comprises an input circuit, a main control circuit, a first current detection current limiting circuit, a second current detection current limiting circuit, an output total current detection circuit, an output filtering circuit, an indication circuit and an identification circuit.

As shown in fig. 3, the input circuit includes a fuse F1 for protection, a patch capacitor C1 for filtering, an electrolytic capacitor C2, and a loop inductor L1, where the fuse F1 plays a role in protecting in a loop, and when an input current increases due to an abnormal operation of the loop, the fuse blows to isolate an input voltage. The patch capacitor C1 and the electrolytic capacitor C2 are used for filtering and supplying energy to a switching conversion circuit at the rear stage of the circuit. The annular inductor L1, the C1 and the C2 form pi-type filtering to improve EMI.

Specifically, the type of the fuse is F15A/32V, the type of the C1 is 100nF/50V, the type of the C3 is 56uF/35V, and the inductance of the L1 is 45 uH.

As shown in fig. 4, the main control loop includes a control chip U1, an energy storage inductor L2, and a plurality of IC peripheral resistors and capacitors combined into a step-down loop, and is configured to convert a 12-24V DC voltage into a 5V DC voltage.

As shown in fig. 5, the first current detection current limiting loop comprises RCS1 for detecting the output current of USB1 port and adjusting the output OCP function, as shown in fig. 6, the second current detection current limiting loop comprises RCS2 for detecting the output current of USB2 port and adjusting the output OCP function, and the output currents of the first current detection current limiting loop and the second current detection current limiting loop are less than 2.4A.

As shown in fig. 7, the output total current detection circuit includes a current limiting chip U2, detection resistors R14 and R20 for detecting the total output current of the dual USB ports and adjusting the output OCP function, and a transistor Q1, and can detect the total output current of the dual USB ports and adjust the output OCP function (3.6A) through the resistors R14 and R20, and when the current limiting chip U2 detects an overcurrent, the transistor Q1 turns off the main circuit control chip U1, thereby implementing the function of limiting the total output current.

Specifically, the model of the control chip U1 is GS92D2, the model of the inductor L2 is CS096125/11uH, the models of the detection resistors RCS1 and RCS2 are 40m Ω, the model of the current limiting chip U2 is AP4320B, the resistances of the detection resistors R14 and R20 are 30m Ω, and the model of the triode Q1 is MMBT 3906.

As shown in FIG. 10, the output filter loop includes a solid state capacitor C12 for output filtering, and the solid state capacitor C12 is 330 uF/6.3V.

As shown in fig. 8, the indication circuit includes light emitting diodes LED1, LED2, LED3, LED4, chip resistors R7, R8, R9, and R19, the model of the light emitting diodes LED1, LED2, LED3, and LED4 is BZ-ET0603UB, the resistances of the resistors R7, R8, R9, and R19 are 330 Ω, and the LED is lit after the input is energized, indicating that the 5V output is normal.

As shown in fig. 9, the identification circuit includes an identification chip U3, a chip capacitor C10, and a chip resistor R11, the identification circuit is used to identify the charging device, the model of the identification chip U3 is UC2634, the model of the chip capacitor C10 is 100nF/50V, and the resistance of the chip resistor R11 is 1K Ω.

As shown in fig. 2, the dual-port output vehicle-mounted charger of the embodiment realizes that the single-port current limiting circuit and the dual-port total current limiting circuit can independently limit the current of two output ports to 2.4A, and any one output port can output 2.4A, so that the dual-port output vehicle-mounted charger is convenient for a user to use daily and does not need to specially select which port can meet 2.4A; when two ports used simultaneously, the restriction total current is 3.6A, and two port intelligent allocation electric currents ensure that the car fills product normal work, can not lead to the potential safety hazard because of the high temperature, through realizing that on-vehicle charger output single port current-limiting and two port are always current-limiting, have ensured the performance of product. In addition, the two current limiting modes are used simultaneously, which is equivalent to double protection of the product, and the safety and reliability of the product are ensured.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a two port output vehicle charger realize single mouthful of current-limiting and two port total current-limiting circuit which characterized in that: the current detection circuit comprises an input circuit, a main control loop, a first current detection current-limiting loop, a second current detection current-limiting loop, an output total current detection loop, an output filtering loop, an indication loop and an identification circuit.

2. The dual-port output vehicle-mounted charger circuit for realizing single-port current limiting and dual-port total current limiting according to claim 1, characterized in that: the input circuit comprises a fuse F1 for protection, a patch capacitor C1 for filtering, an electrolytic capacitor C2 and a ring inductor L1.

3. The dual-port output vehicle-mounted charger circuit for realizing single-port current limiting and dual-port total current limiting according to claim 1, characterized in that: the model of the fuse is F15A/32V, the model of the C1 is 100nF/50V, the model of the C3 is 56uF/35V, and the inductance of the L1 is 45 uH.

4. The dual-port output vehicle-mounted charger circuit for realizing single-port current limiting and dual-port total current limiting according to claim 1, characterized in that: the main control loop comprises a control chip U1, an energy storage inductor L2 and a voltage reduction loop formed by combining a plurality of IC peripheral resistors and capacitors, and is used for converting 12-24V DC voltage into 5V DC voltage.

5. The dual-port output vehicle-mounted charger circuit for realizing single-port current limiting and dual-port total current limiting according to claim 1, characterized in that: the first current detection current-limiting loop comprises an RCS1 and is used for detecting the output current of a USB1 port and adjusting the output OCP function, the second current detection current-limiting loop comprises an RCS2 and is used for detecting the output current of a USB2 port and adjusting the output OCP function, and the output currents of the first current detection current-limiting loop and the second current detection current-limiting loop are smaller than 2.4A.

6. The dual-port output vehicle-mounted charger circuit for realizing single-port current limiting and dual-port total current limiting according to claim 1, characterized in that: the output total current detection loop comprises a current limiting chip U2, detection resistors R14 and R20 and a triode Q1, wherein the detection resistors are used for detecting the output total current of the double USB ports and adjusting the output OCP function.

7. The dual-port output vehicle-mounted charger circuit for realizing single-port current limiting and dual-port total current limiting according to claim 1, characterized in that: the model of the control chip U1 is GS92D2, the model of the inductor L2 is CS096125/11uH, the models of the detection resistors RCS1 and RCS2 are 40m omega, the model of the current limiting chip U2 is AP4320B, the resistances of the detection resistors R14 and R20 are 30m omega, and the model of the triode Q1 is MMBT 3906.

8. The dual-port output vehicle-mounted charger circuit for realizing single-port current limiting and dual-port total current limiting according to claim 1, characterized in that: the output filtering loop comprises a solid-state capacitor C12 used for output filtering, and the solid-state capacitor C12 is 330 uF/6.3V.

9. The dual-port output vehicle-mounted charger circuit for realizing single-port current limiting and dual-port total current limiting according to claim 1, characterized in that: the indicating loop comprises light emitting diodes LED1, LED2, LED3, LED4, chip resistors R7, R8, R9 and R19, the light emitting diodes LED1, LED2, LED3 and LED4 are of BZ-ET0603UB, and the resistors R7, R8, R9 and R19 are 330 omega.

10. The dual-port output vehicle-mounted charger circuit for realizing single-port current limiting and dual-port total current limiting according to claim 1, characterized in that: the identification loop comprises an identification chip U3, a chip capacitor C and a chip resistor R11, the identification loop is used for identifying the charging equipment, the model of the identification chip U3 is UC2634, the model of the chip capacitor C is 100nF/50V, and the resistor of the chip resistor R11 is 1K omega.